Updated on 2022/04/12

写真a

 
HARADA, Masayasu
 
Organization
Graduate School of Science Professor
Graduate School
Graduate School of Science
Undergraduate School
School of Science
Title
Professor
Contact information
メールアドレス

Degree 1

  1. Doctor of Science ( 1993.3   Nagoya University ) 

Research Interests 1

  1. Theoretical Hadron Physics

Research Areas 1

  1. Others / Others  / Elementary Particle/Atomic Nucleus/Cosmic Ray/Space Physics

Current Research Project and SDGs 3

  1. Research on the chiral phase transition and hadron properties in hot and/or dense QCD

  2. Analysis of high density nuclear matter with chiral effective models

  3. Analysis of hadrons including heavy quarks

Research History 5

  1. Nagoya University   Graduate School of Science,   Professor

    2005.5

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    Country:Japan

  2. Nagoya University   Division of Particle and Astrophysical Sciences, Graduate School of Science   Associate professor

    2002.10 - 2005.4

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    Country:Japan

  3. Seoul National University   Department of Physics   Visiting Professor

    2002.3 - 2002.9

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    Country:Korea, Republic of

  4. State University of New York at Stony Brook   Department of Physics and Astronomy   Researcher

    2001.12 - 2002.2

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    Country:United States

  5. Korean Institute for Advanced Study   Visiting Professor

    2001.11

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    Country:Korea, Republic of

Professional Memberships 1

  1. The Physical Society of Japan

 

Papers 68

  1. Doubly heavy tetraquark resonant states

    Meng Qi, Harada Masayasu, Hiyama Emiko, Hosaka Atsushi, Oka Makoto

    PHYSICS LETTERS B   Vol. 824   2022.1

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  2. Chiral condensates for neutron stars in hadron-quark crossover: From a parity doublet nucleon model to a Nambu-Jona-Lasinio quark model

    Minamikawa Takuya, Kojo Toru, Harada Masayasu

    PHYSICAL REVIEW C   Vol. 104 ( 6 )   2021.12

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  3. Quark-hadron crossover equations of state for neutron stars: constraining the chiral invariant mass in a parity doublet model Reviewed International coauthorship International journal

    [1] T. Minamikawa, T. Kojo and M. Harada

    Physical Review C   Vol. 103 ( 4 ) page: 045205:1 - 045205:12   2021.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevC.103.045205

    Web of Science

  4. Suppression of decay widths in singly heavy baryons induced by the U-A(1) anomaly Reviewed International journal

    Kawakami Yohei, Harada Masayasu, Oka Makoto, Suzuki Kei

    PHYSICAL REVIEW D   Vol. 102 ( 11 )   2020.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevD.102.114004

    Web of Science

  5. Inverse mass hierarchy of light scalar mesons driven by anomaly- induced flavor breaking Reviewed International journal

    Kuroda Yoshiki, Harada Masayasu, Matsuzaki Shinya, Jido Daisuke

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2020 ( 5 )   2020.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/ptep/ptaa040

    Web of Science

  6. Chiral effective theory of diquarks and the U-A(1) anomaly Reviewed International coauthorship International journal

    Harada Masayasu, Liu Yan-Rui, Oka Makoto, Suzuki Kei

    PHYSICAL REVIEW D   Vol. 101 ( 5 )   2020.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevD.101.054038

    Web of Science

  7. Heavy quark spin multiplet structure of P-c-like pentaquarks as a P-wave hadronic molecular state Reviewed International journal

    Shimizu Yuki, Yamaguchi Yasuhiro, Harada Masayasu

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2019 ( 12 )   2019.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/ptep/ptz146

    Web of Science

  8. Constraint to chiral invariant masses of nucleons from GW170817 in an extended parity doublet model Reviewed International journal

    Yamazaki Takahiro, Harada Masayasu

    PHYSICAL REVIEW C   Vol. 100 ( 2 )   2019.8

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevC.100.025205

    Web of Science

  9. Singly heavy baryons with chiral partner structure in a three-flavor chiral model Reviewed International journal

    Kawakami Yohei, Harada Masayasu

    PHYSICAL REVIEW D   Vol. 99 ( 9 )   2019.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevD.99.094016

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  10. Chiral partner structure of light nucleons in an extended parity doublet model

    Yamazaki Takahiro, Harada Masayasu

    PHYSICAL REVIEW D   Vol. 99 ( 3 )   2019.2

  11. Studies of extremely dense matter in heavy-ion collisions at J-PARC

    Sako H., Ahn J. K., Akamatsu Y., Asakawa M., Ashikaga S., Busch O., Chiu M., Chujo T., Cirkovic P., Csorgo T., David G., Devetak D., Dordevic M., Esumi S., Fujii H., Fukushima K., Garg P., Gunji T., Hachiya T., Hamagaki H., Harada H., Harada M., Hasegawa S., Hatsuda T., Hirano T., Hong B., Hotchi H., Hwang S. H., Ichikawa Y., Ichisawa T., Imai K., Inaba M., Itakura K., Kamiya J., Kaneta M., Kato H., Kato S., Kim B. C., Kim E. J., Kinsho M., Kitazawa M., Kovalenko A., Liu Y., Luo X., Maruyama T., Miake Y., Milosevic J., Mishra D., Morita K., Murase K., Nadjdjerdj L., Nagamiya S., Nakamura A., Nakamura T., Nara Y., Naruki M., Nishio K., Nonaka C., Nonaka T., Ogino M., Ohnishi A., Oka M., Okabe A., Okamura M., Oyama K., Ozawa K., Saha P. K., Saito T., Sakaguchi A., Sakaguchi T., Sakai S., Sato K., Sato S., Sawada S., Shigaki K., Shimansky S., Shimomura M., Shobuda Y., Stojanovic M., Sugimura H., Takeuchi Y., Tamura F., Tamura H., Tamura J., Tanaka K. H., Tanaka Y., Tani N., Tanida K., Watanabe Y., Xu N., Yamamoto M., Yokkaichi S., Yoo I. K., Yoshimoto M.

    NUCLEAR PHYSICS A   Vol. 982   page: 959 - 962   2019.2

  12. Heavy quark spin multiplet structure of (P)over-bar(*)Sigma(Q)(*) molecular states

    Shimizu Yuki, Yamaguchi Yasuhiro, Harada Masayasu

    PHYSICAL REVIEW D   Vol. 98 ( 1 )   2018.7

  13. Chiral partner structure of doubly heavy baryons with heavy quark spin-flavor symmetry

    Ma Yong-Liang, Harada Masayasu

    JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS   Vol. 45 ( 7 )   2018.7

  14. Analysis of Lambda(c)(2595), Lambda(c)(2625), Lambda(b)(5912), Lambda(b)(5920) based on a chiral partner structure

    Kawakami Yohei, Harada Masayasu

    PHYSICAL REVIEW D   Vol. 97 ( 11 )   2018.6

  15. Catalysis of partial chiral symmetry restoration by Delta matter

    Takeda Yusuke, Kim Youngman, Harada Masayasu

    PHYSICAL REVIEW C   Vol. 97 ( 6 )   2018.6

  16. Novel dual chiral density wave in nuclear matter based on a parity doublet structure

    Takeda Yusuke, Abuki Hiroaki, Harada Masayasu

    PHYSICAL REVIEW D   Vol. 97 ( 9 )   2018.5

  17. Hidden Charm Pentaquark $P_c(4380)$ and Doubly Charmed Baryon $\Xi_{cc}^*(4380)$ as Hadronic Molecule States Reviewed

    Y.Shimizu and M.Harada

    Physical Review D   Vol. 96 ( 9 ) page: 094012   2017.11

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    DOI: https://doi.org/10.1103/PhysRevD.96.094012

  18. Relation between the mass modification of the heavy-light mesons and the chiral symmetry structure in dense matter Reviewed

    M.Harada, Y.L.Ma, D.Suenaga and Y.Takeda,

    Progress of Theoretical and Experimental Physics   Vol. 2017 ( 11 ) page: 113D01   2017.11

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    DOI: https://doi.org/10.1093/ptep/ptx140

  19. Spectral functions for $\bar{D}$ and $\bar{D}_0^*$ mesons in nuclear matter with partial restoration of chiral symmetry Reviewed

    D.Suenaga, S.Yasui and M.Harada,

    Physical Review C   Vol. 96 ( 1 ) page: 015204   2017.6

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    DOI: https://doi.org/10.1103/PhysRevC.96.015204

  20. Charged pions tagged with polarized photons probing strong CP violation in a chiral-imbalance medium Reviewed

    M.Kawaguchi, M.Harada, S.Matsuzaki and R.Ouyang,

    Physical Review C   Vol. 95 ( 6 ) page: 065204   2017.6

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    It is expected that in a hot QCD system, a local parity-odd domain can be produced due to nonzero chirality, which is induced from the difference of winding numbers carried by the gluon topological configuration (QCD sphaleron). This local domain is called the chiral-imbalance medium, characterized by nonzero chiral chemical potential, which can be interpreted as the time variation of the strong CP phase. We find that the chiral chemical potential generates the parity breaking term in the electromagnetic form factor of charged pions. Heavy ion collision experiments could observe the phenomenological consequence of this parity-odd form factor through the elastic scattering of a pion and a photon in the medium. Then we quantify the asymmetry rate of the parity violation by measuring the polarization of the photon associated with the pion, and discuss how it could be measured in a definite laboratory frame. We roughly estimate the typical size of the asymmetry, just by picking up the pion resonant process, and find that the signal can be sufficiently larger than possible background events from parity-breaking electroweak process. Our findings might provide a novel possibility to make a manifest detection for the remnant of the strong CP violation.

    DOI: https://doi.org/10.1103/PhysRevC.95.065204

  21. Application of the hidden local symmetry in hadron physics

    Harada Masayasu

    INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS   Vol. 26 ( 1-2 )   2017

  22. Coupled channel analysis of molecule picture of Pc (4380) Reviewed

    Y. Shimizu, D. Suenaga and Masayasu Harada

    Physical Review D   Vol. 93 ( 11 ) page: 114003   2016.6

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    We construct a potential obtained by one-pion exchange for the coupled channel $¥Sigma_c^¥ast$$¥bar{D}$-$¥Sigma_c$$¥bar{D}^¥ast$, and solve the coupled Schr¥"{o}dinger equations to determine the binding energy.
    We find that there exists one or two bound states with the binding energy of several MeV below the threshold of $¥Sigma_c^¥ast$ and $¥bar{D}$, dominantly made from a $¥Sigma_c^¥ast$ baryon and a $¥bar{D}$ meson, with the size of about $1.5$¥,fm for wide parameter region.
    We also study the pentaquark states including a $b$ quark and/or an anti-$b$ quark.
    We show that there exist pentaquarks including $c¥bar{b}$, $b¥bar{c}$ and $b¥bar{b}$, all of which lie at about $10$¥,MeV below the corresponding threshold and have size of about $1.5$¥,fm.

    DOI: 10.1103/PhysRevD.93.114003

  23. Appearance of novel modes of Dbar mesons with negative velocity in the dual chiral density wave Reviewed

    Daiki Suenaga and Masayasu Harada

    Physical Review D   Vol. 93   page: 076005   2016.4

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    DOI: 10.1103/PhysRevD.93.076005

  24. Mass of heavy-light mesons in a constituent quark picture with partially restored chiral symmetry Reviewed

    A. Park, P. Gubler, Masayasu Harada, S. H. Lee, C. Nonaka and W. Park

    Physical Review D   Vol. 93 ( 5 ) page: 054035   2016.3

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    DOI: 10.1103/PhysRevD.93.054035

  25. Degeneracy of doubly heavy baryons from heavy quark symmetry Reviewed

    Yong-Liang Ma, Masayasu Harada

    Physics Letters B   Vol. 754   page: 125-128   2016.1

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    DOI: 10.1016/j.physletb.2016.01.011

  26. Effects of the scalar mesons in a Skyrme model with hidden local symmetry Reviewed

    Bing-Ran He, Yong-Liang Ma, Masayasu Harada

    Physical Review D   Vol. 92   page: 076007   2015.10

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    DOI: 10.1103/PhysRevD.93.076005

  27. Extended Goldberger-Treiman relation in a three-flavor parity doublet model Reviewed

    Hiroki Nishihara, Masayasu Harada

    Physical Review D   Vol. 92   page: 054022   2015.9

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    DOI: 10.1103/PhysRevD.92.054022

  28. Asymmetric nuclear matter in a parity doublet model with hidden local symmetry Reviewed

    Yuichi Motohiro, Youngman Kim, Masayasu Harada

    Physical Review C   Vol. 92   page: 025201   2015.8

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    DOI: 10.1103/PhysRevC.92.025201

  29. Doubly heavy baryons with chiral partner structure Reviewed

    Yong-Liang Ma, Masayasu Harada

    Physics Letters B   Vol. 748   page: 463-466   2015.6

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    DOI: 10.1016/j.physletb.2015.07.046

  30. Inhomogeneous quark condensate in compressed Skyrmion matter Reviewed

    Masayasu Harada, Hyun Kyu Lee, Yong-Liang Ma, Mannque Rho

    Physical Review D   Vol. 91   page: 096011:1-6   2015.5

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    DOI: 10.1103/PhysRevD.91.096011

  31. Mass degeneracy of heavy-light mesons with chiral partner structure in the half-Skyrmion phase Reviewed

    Daiki Suenaga, Bing-Ran He, Yong-Liang Ma, Masayasu Harada

    Physical Review D   Vol. 91   page: 036001:1-5   2015.2

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    DOI: 0.1103/PhysRevD.91.036001

  32. Dense baryonic matter in conformally-compensated hidden local symmetry: Vector manifestation and chiral symmetry restoration Reviewed

    Yong-Liang Ma, Masayasu Harada, Hyun Kyu Lee, Yongseok Oh, Byung-Yoon Park, Mannque Rho

    Physical Review D   Vol. 90   page: 034015   2014

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  33. Chiral effective theories from holographic QCD with scalars Reviewed

    Masayasu Harada, Yong-Liang Ma, Shinya Matsuzak

    Physical Review D   Vol. 89   page: 115012   2014

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  34. D and D* meson mixing in spin-isospin correlated cold nuclear matter Reviewed

    Daiki Suenaga, Bing-Ran He, Yong-Liang Ma, Masayasu Harada

    Physical Review C   Vol. 89   page: 068201   2014

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  35. Enhancement of Chiral Symmetry Breaking from the Pion condensation at finite isospin chemical potential in a holographic QCD model Reviewed

    Hiroki Nishihara, Masayasu Harada

    Physical Review D   Vol. 89   page: 076001   2014

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  36. Dense Baryonic Matter in Hidden Local Symmetry Approach: Half-Skyrmions and Nucleon Mass Reviewed

    Yong-Liang Ma, Masayasu Harada, Hyun Kyu Lee, Yongseok Oh, Byung-Yoon Park and Mannque Rho

    Physical Review D   Vol. 88   page: 014016   2013.7

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    DOI: 10.1103/PhysRevD.88.014016

  37. Chiral partner structure of heavy baryons from the bound state approach with hidden local symmetry Reviewed

    Masayasu Harada and Yong-Liang Ma

    Physical Review D   Vol. 87   page: 056007   2013.3

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    DOI: 10.1103/PhysRevD.87.056007

  38. Skyrmions with vector mesons in the hidden local symmetry approach Reviewed

    Yong-Liang Ma, Ghil-Seok Yang, Yongseok Oh, Masayasu Harada

    Physical Review D   Vol. 87   page: 034023   2013.2

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    DOI: 10.1103/PhysRevD.87.034023

  39. Parity doubling structure of nucleon at non-zero density in the holographic mean field theory Reviewed

    Bing-Ran He, Masayasu Harada

    Physical Review D   Vol. 88   page: 095007   2013

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  40. Hidden Local Symmetry and Infinite Tower of Vector Mesons for Baryons Reviewed

    Yong-Liang Ma, Yongseok Oh, Ghil-Seok Yang, Masayasu Harada, Hyun Kyu Lee, Byung-Yoon Park, Mannque Rho

    Physical Review D   Vol. 86 ( 7 ) page: 074025:1-9   2012.10

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    In an effort to access dense baryonic matter relevant for compact stars
    in a unified framework that handles both single baryon and multibaryon
    systems on the same footing, we first address a holographic dual action
    for a single baryon focusing on the role of the infinite tower of vector
    mesons deconstructed from five dimensions. To leading order in 't Hooft
    coupling $\lambda=N_c g_{\rm YM}^2$, one has the
    Bogomol'nyi-Prasad-Sommerfield (BPS) Skyrmion that results when the
    warping of the bulk background and the Chern-Simons term in the
    Sakai-Sugimoto D4/D8-${\bar{\rm D8}}$ model are ignored. The infinite
    tower was found by Sutcliffe to induce flow to a conformal theory, i.e.,
    the BPS. We compare this structure to that of the SS model consisting of
    a 5D Yang-Mills action in warped space and the Chern-Simons term in
    which higher vector mesons are integrated out while preserving hidden
    local symmetry and valid to $O(\lambda^0)$ and $O(p^4)$ in the chiral
    counting. We point out the surprisingly important role of the $\omega$
    meson that figures in the Chern-Simons term that encodes chiral anomaly
    in the baryon structure and that may be closely tied to short-range
    repulsion in nuclear interactions.

    DOI: 10.1103/PhysRevD.86.074025

  41. Holographic Mean-Field Theory for Baryon Many-Body Systems Reviewed

    Masayasu Harada, Shin Nakamura, Shinpei Takemoto

    Physical Review D   Vol. 86 ( 2 ) page: 021901(R):1-4   2012.7

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    We propose a mean-field approach to analyze many-body systems of
    fermions in the gauge/gravity duality. We introduce a non-vanishing
    classical fermionic field in the gravity dual, which we call the
    holographic mean field for fermions. The holographic mean field takes
    account of the many-body dynamics of the fermions in the bulk. The
    regularity condition of the holographic mean field fixes the
    relationship between the chemical potential and the density
    unambiguously. Our approach provides a new framework of gauge/gravity
    duality for finite-density systems of baryons in the confinement phase.

    DOI: 10.1103/PhysRevD.86.021901

  42. Effect of sigma meson on the D1(2430) -> D pi pi decay. Reviewed

    Masayasu Harada, Hironori Hoshino, Yong-Liang Ma

    Physical Review D   Vol. 85 ( 11 ) page: 114027:1-14   2012.6

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    We study the effect of sigma meson on the $D_1(2430) \to D\pi\pi$ decay
    by constructing an effective Lagrangian preserving the chiral symmetry
    and the heavy quark symmetry. The sigma meson is included through a
    linear sigma model, in which both the $q\bar{q}$ and $qq\bar{q}\bar{q}$
    states are incorporated respecting their different $U(1)_{A}$
    transformation properties. We first fit the sigma meson mass and
    $\sigma$-$\pi$-$\pi$ coupling constant to the I=0, $S$-wave $\pi$-$\pi$
    scattering data. Then, we show how the differential decay width
    $d\Gamma(D_1 \to D(\pi\pi)_{I = 0, L =0})/d m_{\pi\pi}$ depends on the
    quark structure of the sigma meson. We find that our study, combing with
    the future data, can give a clue to understand the sigma meson
    structure.

    DOI: DOI: 10.1103/PhysRevD.85.114027

  43. Anomalous omega-Z-gamma Vertex from Hidden Local Symmetry Reviewed

    Masayasu Harada, S. Matsuzaki and K. Yamawaki

    Physical Review D   Vol. 84 ( 2 ) page: 036010:1-11   2011.8

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    We formulate the general form of omega-Z-gamma vertex in the framework
    based on the hidden local symmetry (HLS), which arises from the gauge
    invariant terms for intrinsic parity-odd (IP-odd) part of the effective
    action. Those terms are given as the homogeneous part of the general
    solution (having free parameters) to the Wess-Zumino (WZ) anomaly
    equation and hence are not determined by the anomaly, in sharp contrast
    to the Harvey-Hill-Hill (HHH) action where the relevant vertex is
    claimed to be uniquely determined by the anomaly. We show that, even in
    the framework that HHH was based on, the omega-Z-gamma vertex is
    actually not determined by the anomaly but by the homogeneous
    (anomaly-free) part of the general solution to the WZ anomaly equation
    having free parameters in the same way as in the HLS formulation: The
    HHH action is just a particular choice of the free parameters in the
    general solution. We further show that the omega-Z-gamma vertex related
    to the neutrino (nu) - nucleon (N) scattering cross section sigma(nu N
    -> nu N (N')gamma) is determined not by the anomaly but by the
    anomaly-free part of the general solution having free parameters.
    Nevertheless we find that the cross section sigma(nu N -> nu
    N(N')gamma) is related through the Ward-Takahashi identity to
    Gamma(omega -> pi^0 gamma) which has the same parameter-dependence as
    that of sigma(nu N -> nu N(N')gamma) and hence the ratio sigma(nu N
    -> nu N(N')gamma)/Gamma(omega -> pi^0 gamma) is fixed
    independently of these free parameters. Other set of the free parameters
    of the general solution can be fixed to make the best fit of the omega
    -> pi^0 l^+ l^- process, which substantially differs from the HHH
    action. This gives a prediction of the cross section sigma(nu N -> nu
    N (N')gamma^*(l^+ l^-)) to be tested at nu-N collision experiments in
    the future.

    DOI: 10.1103/PhysRevD.84.036010

  44. Strong and radiative decays of X(3872) as a hadronic molecule with a negative parity Reviewed

    Masayasu Harada and Y. L. Ma

    Progress of Theoretical Physics   Vol. 126 ( 1 ) page: 91-113   2011.7

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    Properties of X(3872) are studied by regarding it as a $DD^{\ast}$
    hadronic molecule with $J^{PC} = 2^{-+}$ in the phenomenological
    Lagrangian approach. We find that our model with about 97.6% isospin
    zero component explains the existing data nicely, for example, the ratio
    $\mathcal{B}(X(3872) \to J/\psi\pi^+\pi^-\pi^0)/\mathcal{B}(X(3872) \to
    J/\psi\pi^+\pi^-)$. We predict the partial widths of the radiative
    decays of $X(3872) \to \gamma J/\psi$, $\gamma \psi(2S) $ and the strong
    decays of $X(3872) \to J/\psi \pi^+ \pi^-$, $J/\psi \pi^+\pi^-\pi^0$ as
    well as $X(3872) \to \chi_{cJ}\pi^0$. Our analysis shows that the
    measurement of the ratio $\mathcal{B}(X(3872) \to
    \chi_{c0}\pi^0)/\mathcal{B}(X(3872) \to \chi_{c1}\pi^0)$ may signal the
    nature of X(3872).

    DOI: 10.1143/PTP.126.91

  45. Integrating Holographic Vector Dominance to Hidden Local Symmetry for the Nucleon Form Factor Reviewed

    Masayasu Harada and M. Rho

    Physical Review D   Vol. 83 ( 11 ) page: 114040:1-14   2011.6

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    We derive a two-parameter formula for the electromagnetic form factors
    of the nucleon described as an instanton by "integrating out" all KK
    modes other than the lowest mesons from the infinite-tower of vector
    mesons in holographic QCD while preserving hidden local symmetry for the
    resultant vector fields. With only two parameters, the proton Sachs form
    factors can be fit surprisingly well to the available experimental data
    for momentum transfers $Q^2\lsim 0.5$ GeV$^2$ with $\chi^2$/dof $\lsim
    2$. We interpret this agreement as indicating the importance of an
    infinite tower in the soliton structure of the nucleon. The prediction
    of the Sakai-Sugimoto holographic dual model is checked against the fit
    values to assess its accuracy in describing the proton structure. We
    find that the structure of the "core" of roughly 1/3 in the proton size
    indicated in experiments and commonly associated with an intrinsic
    quark-gluon structure in QCD is "hidden" in the infinite tower in the
    holographic model.

    DOI: 10.1103/PhysRevD.83.114040

  46. Holographic QCD Integrated back to Hidden Local Symmetry Reviewed

    Masayasu Harada, S. Matuzaki and K. Ymawaki

    Physical Review D   Vol. 82   page: 076010:1- 27   2010.10

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  47. Masses of vector bosons in two-color dense QCD based on the hidden local symmetry Reviewed

    Masayasu Harada, C. Nonaka and T. Yamaoka

    Physical Review D   Vol. 81   page: 096003:1-12   2010.5

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  48. Enhancement of quark number susceptibility with an alternativepattern of chiral symmetry breaking in dense matter Reviewed

    Masayasu Harada, Chihiro Sasaki and Shinpei Takemoto

    Physical Review D   Vol. 81   page: 016009 (1-11)   2010.1

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    We explore a possible phase where chiral SU(2)L × SU(2)R symmetry is
    spontaneously broken while its center Z2 symmetry remains unbroken
    and its consequence on thermal quantities. In this
    phase, chiral symmetry breaking is driven by a quartic quark
    condensate although a bilinear quark condensate vanishes.
    We find a new critical point between
    the Z2 broken and unbroken phases.
    We show that the net quark number density exhibits an abrupt change
    near the restoration of the center symmetry rather than
    that of the chiral symmetry.

  49. A novel spectral broadening from vector--axial-vector mixing in densematter Reviewed

    Masayasu Harada and Chihiro Sasaki

    Physical Review C   Vol. 80   page: 054912 (1-6)   2009.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    The presence of baryonic matter leads to the mixing
    between transverse rho and a1 mesons through a set of omega-rho-a1-type interactions, which results in
    the modification to the dispersion relation.
    We show that a clear enhancement of the vector spectral function appears below rho meson mass scale
    for small three-momenta of the rho meson,
    and thus the vector spectrum exhibits broadening.
    We also discuss its relevance to dilepton measurements.

  50. Hidden Local Field Theory and Dileptons in Relativistic Heavy IonCollisions Reviewed

    G.E. Brown, M. Harada, J.W. Holt, M. Rho and C. Sasaki

    Progress of Theoretical Physics   Vol. 121 ( 6 ) page: 1209-1236   2009.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    The notion of "hadronic freedom" is introduced based on the vector manifestation of hidden local symmetry and is used to suggest that the dileptons measured in relativistic heavy-ion collisions do not provide {\em direct} information on the spontaneous breaking of chiral symmetry and hence on the mechanism for mass generation of light-quark hadrons. We give arguments how the dileptons emitted from those vector mesons whose masses are shifted \`a la Brown-Rho (BR) scaling by the vacuum change in temperature -- as in heavy-ion collisions -- and/or density -- as in cold compressed matter -- could be strongly suppressed in the hadronic free region between the chiral restoration point and the "flash point" at which the vector mesons recover $\gsim 90%$ of their free-space on-shell masses and the full strong coupling strength. It may seem ironical that the very mechanism i.e., the vector manifestation in hidden local symmetry, that is to make the mass drop and modify the spectral function is in turn responsible for the dilepton suppression. A possible falsification of this drastic prediction will be indicated. We also briefly discuss the potential role played by the holographic dimension intrinsic in gravity-gauge duality that provides a unified field theory description of hadrons -- both mesons and baryons -- under extreme conditions. Baryons arise as coherent states of pions and vector mesons of holographic QCD which define the ground state or the "vacuum" on which mesonic excitations could undergo BR scaling.

  51. カイラル摂動論 Invited

    原田正康

    原子核研究 「南部陽一郎先生ノーベル賞受賞記念特集号」   Vol. 53 ( Suppl. 3 ) page: 76-88   2009.4

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    Authorship:Lead author   Language:Japanese  

    1979年にWeinbergにより創始され、1984年、85年にGasserとLeutwylerに
    よって確立された「カイラル摂動論」を
    有効場の理論の考え方に基づく組織的展開法を中心に紹介します。

  52. *Vector-axialvector mixing from a chiral effective field theory at finite temperature Reviewed

    Masayasu Harada, Chihiro Sasaki, Wolfram Weise

    Physical Review D   Vol. 78 ( 11 ) page: 114003 (1-10)   2008.12

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    We study the vector–axial-vector mixing in a hot medium and its evolution toward the chiral phase transition using different symmetry restoration scenarios based on the generalized hidden local symmetry framework. We show that the presence of the a1 meson reduces the vector spectral function around the rho meson mass and enhances it around the a1 meson mass. The coupling strength of a1 to rho and pi vanishes at the critical temperature due to the degenerate rho-a1 masses. This feature holds rigorously in the chiral limit and still stays intact to good approximation for the physical pion mass.

  53. Quasi-fermion spectrum at finite temperature from coupled Schwinger-Dyson equations for a fermion-boson system Reviewed

    Masayasu Harada, Yukio Nemoto

    Physical Review D   Vol. 78 ( 1 ) page: 014004 (1-9)   2008.7

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    We nonperturbatively investigate a fermion spectrum at finite temperature in a chiral invariant linear sigma model. Coupled Schwinger-Dyson equations for fermion and boson are developed in the real time formalism and solved numerically. From the coupling of a massless fermion with a massive boson, the fermion spectrum shows a three-peak structure at some temperatures even for the strong coupling region. This means that the three-peak structure which was originally found in the one-loop calculation is stable against higher order corrections even in the strong coupling region.

  54. Quasi-Quark Spectrum in the Chiral Symmetric Phase from the Schwinger-Dyson Equation Reviewed

    Masayasu Harada, Yukio Nemoto, Shunji Yoshimoto

    Progress of Theoretical Physics   Vol. 119 ( 1 ) page: 117-137   2008.7

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    We non-perturbatively study the fermion spectrum in the chiral symmetric phase from the Schwinger-Dyson equation with the Feynman gauge, in which we perform an analytic continuation of the solution on the imaginary time axis to the real time axis with a method employing an integral equation. It is shown that the fermion spectrum has two peaks, which correspond to the normal quasi-fermion and the plasmino, although these peaks in the strong coupling region are very broad, owing to multiple scatterings with gauge bosons. We find that the thermal mass of the quasi-fermion saturates at some value of the gauge coupling, beyond which the thermal (pole) mass satisfies M ∼T, independently of the value of the gauge coupling. We also comment on the appearance of a three-peak structure in the fermion spectrum as a non-perturbative effect.

  55. *Thermal dilepton production from dropping rho based on the vector manifestation Reviewed

    Masayasu Harada and Chihiro Sasaki

    Physical Review D   Vol. 74   page: 114006-1 - 114006-14   2006.12

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    Language:English   Publishing type:Research paper (scientific journal)  

  56. Implications of holographic QCD in ChPT with hidden local symmetry Reviewed

    Masayasu Harada, Shinya Matsuzaki and Koichi Yamawaki

    Physical Review D   Vol. 74   page: 076004-1 - 076004-6   2006.10

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  57. The π+ - π0 Mass Difference and the S Parameter in Large Nf QCD Reviewed

    Masayasu Harada, Masafumi Kurachi and Koichi Yamawaki

    Progress Theoretical Physics   Vol. 115 ( 4 ) page: 765 - 795   2006.4

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    Language:English   Publishing type:Research paper (scientific journal)  

  58. Chiral approach to phi radiative decays Reviewed

    Deirdre Black, Masayasu Harada and Joseph Schechter

    Physical Review D   Vol. 73   page: 054017-1 - 054017-13   2006.3

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  59. Dropping ρ and A1 meson masses at chiral phase transition in the generalized hidden local symmetry Reviewed

    Masayasu Harada and Chihiro Sasaki

    Physical Review D   Vol. 73   page: 036001-1 - 036001-16   2006.2

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    Language:English   Publishing type:Research paper (scientific journal)  

  60. Vector Manifestation and the Hidden Local Symmetry

    Masayasu Harada

    International Journal of Modern Physics A   Vol. 21 ( 4 ) page: 946 - 949   2006.2

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    Language:English  

  61. Hidden Local Symmetry Theory as an Effective Field Theory ofQCD

    Masayasu Harada

    Proceedings of Dynamical symmetry breaking, International Workshop, DSB'04, Nagoya, Japan, December 21-22, 2004     page: 171 - 185   2005.6

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  62. A Dynamical Origin of Little Higgs: Hidden Local Symmetry in Large Nf QCD

    Masayasu Harada

    Proceedings of 12th International Conference on Supersymmetry and Unification of Fundamental Interactions(SUSY 04), Tsukuba, Japan, 17-23 June 2004.     page: 925 - 928   2004.12

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  63. Chiral doubling of heavy-light hadrons and the vector manifestation of hidden local symmetry Reviewed

    Masayasu Harada, Mannque Rho and Chihiro Sasaki

    Physical Review D   Vol. 70   page: 074002-1 - 074002-14   2004.10

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    Language:English   Publishing type:Research paper (scientific journal)  

  64. π+ - π0 mass difference from the Bethe-Salpeter equation Reviewed

    Masayasu Harada, Masafumi Kurachi and Koichi Yamawaki

    Physical Review D   Vol. 70   page: 033009-1 - 033009-11   2004.8

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  65. *Hidden local symmetry at loop: A new perspective of composite gauge boson and chiral phase transition Invited Reviewed

    Masayasu Harada and Koichi Yamawaki

    Physics Reports   Vol. 381   page: 1-233   2003.7

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    We develop an effective field theory of QCD and QCD-like theories
    beyond the Standard Model, based on the hidden local symmetry (HLS)
    model for the pseudoscalar mesons (pi) as Nambu-Goldstone
    bosons and the vector mesons (rho) as gauge bosons.
    The presence of gauge symmetry of HLS is vital
    to the systematic low energy expansion or the chiral perturbation
    theory (ChPT) with loops of rho as well as pi.

  66. Vector meson dominance model for radiative decays involving lightscalar mesons Reviewed

    Deidre Black, Masayasu Harada and Joseph Schechter

    Physical Review Letters   Vol. 88   page: 181603 (1-4)   2002.5

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    We study a vector-dominance model which predicts quite a large number
    of currently interesting decay amplitudes of the types S -> gamma gamma,
    V -> S gamma, and S -> V gamma, where S and V denote scalar and
    vector mesons, in terms of three parameters. As an application,
    the model makes it easy to study in detail a recent proposal to boost
    the ratio Gamma(phi -> f0 gamma)/ Gamma(phi -> a0 gamma) by including
    the isospin violating a0 -f0 mixing. However, we find that this
    effect is actually small in our model.

  67. *Chiral Phase Transition of QCD at Finite Temperature and DensityFrom Schwinger-Dyson Equation Reviewed

    Masayasu Harada and Akihiro Shibata

    Physical Review D   Vol. 59   page: 014010 (1-13)   1999.1

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    We study the chiral phase transition of QCD at finite temperature and
    density by numerically solving the Schwinger-Dyson equation for the
    quark propagator with the improved ladder approximation in the Landau
    gauge. Using the solution we calculate a pion decay constant from a
    generalized version of the Pagels-Stokar formula. The chiral phase
    transition point is determined by analyzing an effective potential for
    the quark propagator. We find solutions for which chiral symmetry is
    broken while the value of the effective potential is larger than that
    for the chiral symmetric vacuum. These solutions correspond to
    metastable states, and the chiral symmetric vacuum is energetically
    favored. We present a phase diagram on the general
    temperature-chemical potential plane, and show that phase transitions
    are of first order in wide range.

  68. *Simple Description of pi-pi Scatering to 1 GeV Reviewed

    Masayasu Harada, Francesco Sannino and Joseph Schechter

    Physical Review D   Vol. 54   page: 1991-2004   1996.8

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    Motivated by the 1/Nc expansion, we present a simple model of
    pion-pion scattering as a sum of a `current-algebra' contact term
    and resonant pole exchanges. The model preserves crossing symmetry
    as well as unitarity up to 1.2 GeV. Key features include chiral
    dynamics, vector meson dominance, a broad low energy scalar (sigma)
    meson and a `Ramsauer-Townsend' mechanism for the understanding
    of the 980 MeV region.

▼display all

Books 1

  1. Lecture Note in Physics "The CBM Physics Book" Part II "In-medium excitations"

    J. Aichelin, A. Andronic, F. Antinori, R. Averbeck, R. Bellwied, D. Blaschke, M. Bleicher, M. Bluhm, E. Bratkovskaya, W. Cassing, P. Danielewicz, A. Dumitru, Z. Fodor, V. Friese, B. Friman, C. Fuchs, M. Harada, J. Heuser, T. Hilger, C. Hohne, R. Holzmann, Y. Ivanov, B. Kampfer, F. Karsch, S.D. Katz, M. Kitazawa, T. Klahn, J. Knoll, C.-M. Ko, T. Kunihiro, A. Larionov, Y. Leifels, S. Leupold, D. Mi.kowiec, T. Peitzmann, H. Petersen, P. Petreczky, J. Randrup, R. Rapp, C. Ratti, A. Rebhan, K. Redlich, F. Riek, D. Rischke, D. Rohrich, K. Rummukainen, C. Sasaki, B.-J. Schaefer, E. Scomparin, P. Senger, E. Shuryak, J. Steinheimer, M. Stephanov, M. Thaler, R. Thomas, L. Tolos, V. Toneev, S. Typel, F. Uhlig, H. van Hees, R. Vogt, J. Wambach, F. Weber, W. Weise, F. Wilczek, P. Zhuang, and S. Zschocke ( Role: Joint author)

    Splinger  2011  ( ISBN:978-3-642-13292-6

     More details

    Language:English

Presentations 68

  1. Spin multiplet structure of exotic hadrons based on the heavy quark spin symmetry International conference

    Masayasu Harada

    Workshop on "Physics of heavy-quark and exotic hadrons”  2020.1.27 

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    Event date: 2020.1

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  2. Dense nuclear matter based on a chiral model with parity doublet structure Invited International conference

    Masayasu Harada

    Quarks and Compact Stars 2019  2019.9.27 

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    Event date: 2019.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hanwha Resort, Haeundae, Busan   Country:Korea, Republic of  

  3. Dense nuclear matter based on a chiral model with parity doublet structure Invited International conference

    Masayasu Harada

    the 18th International Conference on Hadron Spectroscopy and Structure (HADRON2019)  2019.8.18 

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    Event date: 2019.8

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Guilin, China   Country:China  

  4. 軽いスカラー中間子質量階層性へのU(1)Aアノマリーの寄与

    原田正康

    クォーク模型からみたエキゾチックハドロン研究の進展とQCDの新展開  2019.7.6 

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    Event date: 2019.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:理化学研究所   Country:Japan  

  5. Study of dense nuclear matter based on the parity doublet structure of nucleons” Invited International conference

    Masayasu Harada

    Workshop on “Development of simulation by GPU for the study of quark-hadron matter at high temperatures and densities”  2018.11.21 

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    Event date: 2018.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  6. Charmed mesons in nuclear matter based chiral effective models Invited International conference

    Masayasu Harada

    8th International Conference on Quarks and Nuclear Physics (QNP2018)  2018.11.13 

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    Event date: 2018.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:つくば市   Country:Japan  

  7. Charmed hadrons in Dense matter based on chiral models Invited International conference

    Masayasu Harada

    Hadron structure and interaction in dense matter  2018.11.11 

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    Event date: 2018.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  8. Light nucleons in an extended parity doublet model International conference

    Masayasu Harada

    Workshop on Dense Matter from Chiral Effective Theories 2018  2018.10.17 

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    Event date: 2018.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  9. Study of phase structure of nuclear matter based on a parity doublet model Invited International conference

    Masayasu Harada

    8th International Symposium on Nuclear Symmetry Energy (NuSYM18)  2018.9.12 

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    Event date: 2018.9

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Hanwha Resort, Haeundae, Busan   Country:Korea, Republic of  

  10. Charmed mesons in medium based on chiral effective models Invited

    2018.6.6 

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    Event date: 2018.6

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  11. Analysis of $\Lambda_c(2595)$, $\Lambda_c(2625)$, $\Lambda_b(5912)$, $\Lambda_b(5920)$ based on a chiral partner structure

    2018.3.25 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  12. Analysis of $\Lambda_c(2595)$, $\Lambda_c(2625)$, $\Lambda_b(5912)$, $\Lambda_b(5920)$ based on a chiral partner structure

    2018.3.6 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  13. Doubly heavy baryons based on chiral effective Lagrangians International conference

    Masayasu Harada

    Reimei Workshop "Hadronic Resonances and Dense Nuclear Matter"  2017.12.12 

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    Event date: 2017.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:JAERI, Tokai   Country:Japan  

  14. 核物質中におけるカイラル対称性の部分的回復とハドロンの質量変化

    原田正康

    ハドロン・原子核物理の理論研究最前線2017  2017.11.20 

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    Event date: 2017.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:KEK   Country:Japan  

  15. Delta matter in a parity doublet model Invited International conference

    Masayasu Harada

    Workshop on Dense Matter from Chiral Effective Theory  2017.9.10 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Jilin University   Country:China  

  16. Delta matter in a parity doublet model Invited

    2017.6.10 

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    Event date: 2017.6 - 2016.6

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  17. Effect of omega meson on the heavy-light mesons with chiral partner structure in dense medium

    2017.3.18 

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    Event date: 2017.3 - 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  18. Effect of partial chiral symmetry restoration in nuclear matter to charmed meson masses based on a chiral partner structure International conference

    Masayasu Harada

    Quarks and Compact Stars 2017  2017.2.22 

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    Event date: 2017.2

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  19. Charmed meson masses in medium based on effective chiral models International conference

    Masayasu Harada

    KEK theory center workshop on Hadron and Nuclear Physics in 2017  2017.1.9 

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    Event date: 2017.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:KEK   Country:Japan  

  20. Mass modification of Delta baryon in nuclear matter based on a parity doublet model Invited International coauthorship International conference

    Masayasu Harada

    APCTP 2016 Workshop on Frontiers of Physics: Dense Matter from Chiral Effective Theories  2016.12.8 

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    Event date: 2016.12

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:APCTP, Pohang   Country:Korea, Republic of  

  21. Medium modification of charmed meson masses based on an effective chiral model International conference

    Masayasu Harada

    2016 JAEA/ASRC Reimei Workshop: New exotic hadron matter at J-PARC 

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    Event date: 2016.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Inha University   Country:Korea, Republic of  

  22. Mass modification of hadrons associated with partial chiral symmetry restoration Invited

    Masayasu Harada

    The 34th Reimei Workshop"Physics of Heavy-Ion Collisions at J-PARC" 

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    Event date: 2016.8

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  23. Medium modification of charmed meson masses through one-boson exchange International conference

    Masayasu Harada

    Mesons in Nucleus 2016 

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    Event date: 2016.7 - 2016.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  24. Effects of the chiral invariant mass of nucleon in nuclear matter Invited International conference

    Masayasu Harada

    J-PARC Workshop 2016: From Exotic hadrons to QGP 

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    Event date: 2016.6

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Korea, Republic of  

  25. Degeneracy of doubly heavy baryons from heavy quark symmetry

    Masayasu Harada and Yong-Liang Ma

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  26. Degeneracy of doubly heavy baryons from heavy quark symmetry

    Masayasu Harada

    Progress on J-PARC hadron physics in 2016 

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    Event date: 2016.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  27. Degeneracy of doubly heavy baryons from heavy quark symmetry

    Masayasu Harada

    he 31st Reimei WorkShop on Hadron Physics in Extreme Conditions at J-PARC 

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    Event date: 2016.1

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  28. A study of asymmetric nuclear matter in a parity doublet model Invited International conference

    Masayasu Harada

    Workshop on Dense Matter from Chiral Effective Theory 

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    Event date: 2015.6

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:China  

  29. Charmed hadrons in nuclear medium Invited

    Masayasu Harada

    KEK theory center workshop on Hadron physics with high-momentum hadron beams at J-PARC in 2015 

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    Event date: 2015.3

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  30. Modification of spectrum of heavy-light mesons in nuclear medium Invited International conference

    Masayasu Harada

    Hadrons and Hadron Interaction in QCD (HHIQCD 2015) 

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    Event date: 2015.3

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  31. Hadron phenomenology based on holographic QCD models International conference

    Masayasu Harada

    The 27th Spring School on Particles and Fields in Taiwan (SS2014) 

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    Event date: 2014.4

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Taiwan, Province of China  

  32. ヘビーハドロン有効理論

    原田正康

    ヘビークォークハドロンと原子核のスペクトルと構造 

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    Event date: 2014.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  33. Chiral Doubling of Heavy Baryons from the Bound State Approach

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  34. Holographic Mean-Field Theory for Baryon Many-Body Systems International conference

    Masayasu Harada

    4th Year of APCTP-WCU Focus program "From dense matter to compact stars in QCD and in hQCD" 

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    Event date: 2013.4

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Korea, Republic of  

  35. Holographic Mean-Field Theory for Baryon Many-Body Systems International conference

    Masayasu Harada

    WCU Mini-workshop on "holographic landscape of dense matter" 

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    Event date: 2012.10

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Korea, Republic of  

  36. Effects of vector - axial-vector mixing to dilepton spectrum in hot and/or dense matter International conference

    Heavy Ion Meeting 2010-12 at Yonsei 

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    Event date: 2010.12

    Language:English   Presentation type:Oral presentation (invited, special)  

  37. New approaches to in-medium spectral functions International conference

    International Workshop on "Electromagnetic Probes of Strongly Interacting Matter: Status and Future of Low-Mass Lepton-Pair Spectroscopy" 

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    Event date: 2010.9

    Language:English   Presentation type:Oral presentation (invited, special)  

  38. Revisiting bound state approach to heavy baryons

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    Event date: 2009.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  39. Effects of vector - axial-vector mixing to dilepton spectrum in hot and/or dense matter International conference

    2009 International Workshop on``Strong Coupling Gauge Theories in LHC Era'' (SCGT 09) 

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    Event date: 2009.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  40. Effects of vector -- axial-vector mixing to dilepton spectrum in hot and/or dense matter

    YITP Molecule workshop, "Algebraic aspect of chiral symmetry for the study of excited baryons" 

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    Event date: 2009.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  41. ベクトル中間子-軸性ベクトル中間子混合を通して探る有限密度・有限温度中のカイラル対称性

    新学術領域「多彩なフレーバーで探る新しいハドロン存在形態の包括的研究」キックオフ研究会 

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    Event date: 2009.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  42. A novel spectral broadening from vector--axial-vectormixing in sense matter International conference

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    Event date: 2009.10

    Language:English   Presentation type:Oral presentation (general)  

  43. D-Meson Mass Splitting obtained in a model based on the hidden local symmetry International conference

    "HEAVY QUARK PHYSICS IN QCD" at KEK 

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    Event date: 2009.9

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  44. A novel spectral broadening from vector-axial-vector mixing in densematter

    YITP workshop on ``Thermal Quantum Field Theory and Their Applications 2009'' 

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    Event date: 2009.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  45. Effects of vector - axial-vector mixing to dilepton spectrumin hot and/or dense matter

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    Event date: 2009.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  46. Effects of vector - axial-vector mixing to dilepton spectrumin hot and/or dense matter International conference

    ``A hot summer week at Yonsei'' 

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    Event date: 2009.7

    Language:English   Presentation type:Oral presentation (general)  

  47. 『カイラル対称性と中間子の質量変化』 (招待講演)

    KEK研究会 『J-PARCの物理:ハドロン・原子核研究の新しい局面』 

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    Event date: 2008.8

    Language:Japanese  

    Country:Japan  

  48. Vector Manifestation at Chiral Phase Transition in the large Nf QCD

    mini-Workshop on Phase Structure of Large Nf QCD 

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    Event date: 2008.5

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  49. Dilepton production from Dropping Rho in theVector Manifestation

    Chiral Symmetry in Hadron and Nuclear Physics 

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    Event date: 2007.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  50. Thermal dilepton production from the dropping rho in the vectormanifestation

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    Event date: 2007.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  51. Thermal dilepton production from the dropping rho in the vector manifestation International conference

    Nagoya Mini-Workshop ``Chiral Symmetry in hot and/or dense matter'' 

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    Event date: 2007.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  52. Thermal dilepton production from dropping ρ based on the vector manifestation International conference

    Workshop on ``Strongly Coupled Quark-Gluon Plasma: SPS, RHIC and LHC'' 

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    Event date: 2007.2

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  53. Two or Four: A Hint from Scalar Mesons in Radiative Phi Decays? International conference

    Yukawa International Seminar (YKIS) 2006``New Frontiers in QCD -Exiotic Hadrons and Hadronic Matter-'' 

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    Event date: 2006.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  54. Thermal Dilepton Production from Dropping Rho based on the VectorManifestation International conference

    APCTP International Workshop on ``Quarks, Nuclei and Universe'' 

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    Event date: 2006.11

    Language:English   Presentation type:Oral presentation (invited, special)  

  55. Dropping rho and A1 meson masses at the chiral phase transition in the generalized hidden local symmetry International conference

    2006 International Workshop on the ``Origin of Mass and Strong Coupling Gauge Theories (SCGT 06)'' 

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    Event date: 2006.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  56. Dropping rho and A1 Meson Masses at Chiral Phase Transition inthe Generalized Hidden Local Symmetry International conference

    Japan-Korea Mini-Workshop on ``QCD and hidden local symmetry in matter under extreme conditions'' 

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    Event date: 2005.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  57. Chiral Structure of D Mesons in the Vector Manifestation International conference

    Second joint meeting of the nuclar physics division of the APSand JPS 

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    Event date: 2005.9

    Language:English   Presentation type:Oral presentation (invited, special)  

  58. Vector Manifestation and the Hidden Local Symmetry International conference

    ``International Conference on QCD and Hadronic Physics'' 

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    Event date: 2005.6

    Language:English   Presentation type:Oral presentation (general)  

  59. Vector Manifestation of Chiral Symmetry International conference

    ECT* Programme ``Electromagnetic Probes of Hot and Dense Matter'' 

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    Event date: 2005.6

    Language:English   Presentation type:Oral presentation (invited, special)  

  60. Chiral approach to the phi radiative decays and the quark structure of the scalar mesons

    ``Exotic Hadrons Workshop'' 

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    Event date: 2005.5

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  61. Radiative Decays involving Scalar Mesons International conference

    Japan-US Workshop on``Electromagnetic Meson Production and Chiral Dynamics'' 

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    Event date: 2005.4

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  62. Hidden Local Symmetry Theory as an Effective Field Theory of QCD

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    Event date: 2005.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  63. Pion Velocity near the Chiral Phase Transition Point in the Vector Manifestation

    YITP workshop on ``Non-equilibrium dynamics in the QCD phase transitions'' 

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    Event date: 2005.2

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  64. Hidden Local Symmetry Theory as an Effective Field Theory of QCD International conference

    Workshop on ``Dynamical Symmetry Breaking'' 

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    Event date: 2004.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  65. Chiral Approach to Radiative Phi Decays

    日本物理学会 

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    Event date: 2004.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  66. Vector manifestation and hidden local symmetry International conference

    ECT*-APCTP International Workshop on``Novel Approaches to the Nuclear Many-Body Problem: From Nuclei to Stellar Matter'' 

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    Event date: 2004.9

    Language:English   Presentation type:Oral presentation (general)  

  67. A Dynamical Origin of Little Higgs: Hidden Local Symmetry in Large Nf QCD International conference

    12th International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY 04) 

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    Event date: 2004.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  68. Scalar Mesons in Radiative Decays and π-π Scattering International conference

    2004 International Workshop on Hadron Physics:``Penta quark, Heavy-light hadron and hot/dense matter'' 

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    Event date: 2004.5

    Language:English   Presentation type:Oral presentation (invited, special)  

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KAKENHI (Grants-in-Aid for Scientific Research) 3

  1. Study of Neutron Stars and Elucidation of origin of hadron masses using chiral effective models

    Grant number:20K03927  2020.4 - 2023.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Authorship:Principal investigator 

    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

  2. Research on high density matter using parity doublet models

    Grant number:16K05345  2016.4 - 2020.3

    Harada Masayasu

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    Authorship:Principal investigator 

    Grant amount:\4550000 ( Direct Cost: \3500000 、 Indirect Cost:\1050000 )

    I constructed an effective model including the nucleon and its parity partner based on the parity doublet structure, and obtained constraints to the model parameters from experimental data for the masses and decay widths of them. Then, I showed that the chiral invariant mass is more than half of the mass of nucleon by using the constraint to the equation of state obtained in the effective model from the observation of neutron stars.
    Furthermore, I constructed effective models of hadrons including heavy quarks based on the chiral symmetry and the heavy-quark symmetry. I gave predictions on the modification of masses for existing hadrons in medium, and masses and decay widths for undiscovered hadrons.

  3. 有限温度・有限密度カイラル相転移とハドロン・クォークの性質の研究        

    2008

    科学研究費補助金  基盤研究(C),課題番号:20540262

    原田 正康

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    Authorship:Principal investigator 

 

Teaching Experience (On-campus) 1

  1. Fundamentals of Physics I

    2011

Teaching Experience (Off-campus) 5

  1. QCDのカイラル有効理論とハドロン物理

    2009.4 - 2010.3 京都大学)

  2. 有効場の理論入門

    2008.4 - 2009.3 奈良女子大学)

  3. 「QCDの有効理論とハドロン物理」

    2006.4 - 2007.3 東京大学)

  4. 「有効場の理論入門」

    2005.4 - 2006.3 大阪大学)

  5. 「有効場の理論入門」

    2004.4 - 2005.3 東京大学)