Updated on 2022/04/19

写真a

 
HAYAKAWA Masashi
 
Organization
Graduate School of Science Associate professor
Graduate School
Graduate School of Science
Undergraduate School
School of Science
Title
Associate professor

Degree 1

  1. 博士(理学) ( 1994.3 ) 

Research Interests 5

  1. lattice gauge theory

  2. anomalous magnetic dipole moment

  3. quantum chromodynamics (QCD)

  4. quantum electrodynamics (QED)

  5. gauge theory

Research Areas 1

  1. Others / Others  / elementary particle physics

Current Research Project and SDGs 1

  1. Study on quantum-mechanical dynamics of gauge theories

 

Papers 40

  1. Hadronic Light-by-Light Scattering Contribution to the Muon Anomalous Magnetic Moment from Lattice QCD Reviewed

    T.Blum, N.Christ, M.Hayakawa, T.Izubuchi, L.Jin, C.Jung and C.Lehner

    Physical Review Letters   Vol. 124 ( 1 ) page: 132002   2020.4

     More details

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

    We report the first result for the hadronic light-by-light scattering contribution to the muon anomalous magnetic moment with all errors systematically controlled. Several ensembles using 2+1 flavors of physical mass Möbius domain-wall fermions, generated by the RBC and UKQCD collaborations, are employed to take the continuum and infinite volume limits of finite volume lattice QED+QCD. We find aμHLbL=7.87(3.06)stat(1.77)sys×10^{-10}. Our value is consistent with previous model results and leaves little room for this notoriously difficult hadronic contribution to explain the difference between the standard model and the BNL experiment.

    DOI: https://doi.org/10.1103/PhysRevLett.124.132002

    arXiv

  2. Connected and Leading Disconnected Hadronic Light-by-Light Contribution to the Muon Anomalous Magnetic Moment with a Physical Pion Mass Reviewed

    T.Blum, N.Christ, M.Hayakawa, T.Izubuchi, L.Jin, C.Jung and C.Lehner

    Physical Review Letters   Vol. 118 ( 2 ) page: 022005   2017.1

     More details

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

    We report a lattice QCD calculation of the hadronic light-by-light contribution to the muon anomalous magnetic moment at physical pion mass. The calculation includes the connected diagrams and the leading, quark-line-disconnected diagrams. We incorporate algorithmic improvements developed in our previous work. The calculation was performed on the 48^3×96 ensemble generated with a physical-pion-mass and a 5.5 fm spatial extent by the RBC and UKQCD collaborations using the chiral, domain wall fermion (DWF) formulation. We find a_\mu(HLbL) =5.35(1.35)×10^{-10}, where the error is statistical only. The finite-volume and finite lattice-spacing errors could be quite large and are the subject of on-going research. The omitted disconnected graphs, while expected to give a correction of order 10%, also need to be computed.

    DOI: 10.1103/PhysRevLett.118.022005

    arXiv

  3. Hadronic light-by-light scattering contribution to the muon anomalous magnetic moment from lattice QCD Reviewed

    T.Blum, S.Chowdhury, M.Hayakawa and T.Izubuchi

    Physical Review Letters   Vol. 114 ( 1 ) page: 012001   2015.1

     More details

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

    The most compelling possibility for a new law of nature beyond the four fundamental forces comprising the standard model of high-energy physics is the discrepancy between measurements and calculations of the muon anomalous magnetic moment. Until now a key part of the calculation, the hadronic light-by-light contribution, has only been accessible from models of QCD, the quantum description of the strong force, whose accuracy at the required level may be questioned. A first principles calculation with systematically improvable errors is needed, along with the upcoming experiments, to decisively settle the matter. For the first time, the form factor that yields the light-by-light scattering contribution to the muon anomalous magnetic moment is computed in such a framework, lattice QCD+QED and QED. A nonperturbative treatment of QED is used and checked against perturbation theory. The hadronic contribution is calculated for unphysical quark and muon masses, and only the diagram with a single quark loop is computed for which statistically significant signals are obtained. Initial results are promising, and the prospect for a complete calculation with physical masses and controlled errors is discussed.

    DOI: 10.1103/PhysRevLett.114.012001

  4. Tenth-Order QED Contribution to the Electron g-2 and an Improved Value of the Fine Structure Constant Reviewed

    Tatsumi Aoyama, Masashi Hayakawa, Toichiro Kinoshita, Makiko Nio

    Physical Review Letters   Vol. 109 ( 11 ) page: 111807   2012.9

     More details

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

    DOI: 10.1103/PhysRevLett.109.111807

  5. Lattice Calculation of Hadronic Light-by-Light Contribution to the Muon Anomalous Magnetic Moment Reviewed

    T.Blum, N.Christ, M.Hayakawa, T.Izubuchi, L.Jin and C.Lehner

    Physical Review D   Vol. 93   page: 014503   2016.1

     More details

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

    The quark-connected part of the hadronic light-by-light scattering contribution to the muon's anomalous magnetic moment is computed using lattice QCD with chiral fermions. We report several significant algorithmic improvements and demonstrate their effectiveness through specific calculations which show a reduction in statistical errors by more than an order of magnitude. The most realistic of these calculations is performed with a near-physical, 171 MeV pion mass on a (4.6fm)^3 spatial volume using the 323×64 Iwasaki+DSDR gauge ensemble of the RBC/UKQCD Collaboration.

    DOI: 10.1103/PhysRevD.93.014503

  6. Complete Tenth-Order QED Contribution to the Muon g-2 Reviewed

    Tatsumi Aoyama, Masashi Hayakawa, Toichiro Kinoshita, Makiko Nio2

    Physical Review Letters   Vol. 109 ( 11 ) page: 111808   2012.9

     More details

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

    DOI: 10.1103/PhysRevLett.109.111808

  7. Electromagnetic mass splittings of the low lying hadrons and quark masses from 2+1 flavor lattice QCD+QED Reviewed

    T.Blum, R.Zhou, T.Doi, M.Hayakawa, T.Izubuchi, S.Uno and N.Yamada

    Physical Review D   Vol. 82   page: 094508   2010.11

     More details

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

    We determine the masses of light quarks by computing the light pseudo-scalar bosons via lattice QCD + QED. We also show that the origin of mass difference between proton and neutron, which is the source of nucleosynthesis, can be obtained from the first principle of quantum field theory.

  8. Tenth-Order Electron Anomalous Magnetic Moment --- Contribution of Diagrams without Closed Lepton Loops Reviewed

    T.Aoyama, M.Hayakawa, T.Kinoshita and M.Nio

    Physical Review D   Vol. 91 ( 3 ) page: 033006   2015.2

     More details

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

    The paper presents a detailed account of the evaluation of the electron anomalous magnetic moment, which arises from 6354 number of Feynman diagrams without closed lepton loops. The most precise value of the fine structure constant is also presented.

    DOI: 10.1103/PhysRevD.91.033006

  9. *Automated Calculation Scheme for alpha^n Contributions of QED to Lepton g-2: New Treatment of Infrared Divergence for Diagrams without Lepton Loops Reviewed

    Tatsumi Aoyama, Masashi Hayakawa, Toichiro Kinoshita, Makiko Nio

    Nuclear Physics B   Vol. 796   page: 184   2008

     More details

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

    Theoretical computation of the tenth-order QED contribution to lepton g-2 is required for the most accurate determination of fine structure constant, strength of electromagnetic interaction. This needs computation of 12,672 number of complicated Feynman diagrams. It may cost you over 700 years if you write correct numerical programs for this computation. The goal of our group started our project to complete this computation within about five years three years ago by developing automation of almost whole computations. The paper is concerned with the remained part of this automation: treatment of infrared divergence from practical point of view.

  10. *Revised value of the eighth-order QED contribution to the anomalous magnetic moment of the electron Reviewed

    T.Aoyama, M.Hayakawa,T.Kinoshita,M.Nio

    Physical Review D   Vol. 77   page: 053012   2008.3

     More details

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

    The author find that the value of the eighth-order QED contribution to the anomalous magnetic moment reported previously is incorrect
    and present its revised value.

  11. Full QED + QCD low-energy constants through reweighting Reviewed

    T.Ishikawa, T.Blum, M. Hayakawa, T. Izubuchi, C. Jung and R. Zhou

    Physical Review Letters   Vol. 109   page: 072002   2012.8

     More details

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

    The effect of sea quark electromagnetic charge on meson masses is investigated, and first results for full QED+QCD low-energy constants are presented. The electromagnetic charge for sea quarks is incorporated in quenched QED+full QCD lattice simulations by a reweighting method. The reweighting factor, which connects quenched and unquenched QED, is estimated using a stochastic method on 2+1 flavor dynamical domain-wall quark ensembles.

    DOI: 10.1103/PhysRevLett.109.072002

  12. *QED in finite volume and finite size scaling effect on electromagnetic properties of hadrons Reviewed

    M. Hayakawa and S. Uno

    Progress of Theoretical Physics   Vol. 120   page: 413-441   2008.4

     More details

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

    The finite volume effect is one of systematic errors contained in the hadronic quantities measured in the lattice (QCD + QED) simulations. We construct QED on finite volume and determine the size of this effect from the low energy effective theory of QCD and QED.

  13. Running coupling constant of ten-flavor QCD with the Schr\'odinger functional method Reviewed

    M. Hayakawa, K.-I.Ishikawa, S. Takeda, S. Uno, N. Yamada

    Physical Review D   Vol. 83   page: 074509   2011.4

     More details

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

    We study the running gauge coupling constant of ten-flavor QCD by the lattice simulation. We give an evidence that the theyr possesses an infrared fixed point.

  14. * Revised value of the eighth-order electron g-2 Reviewed

    T. Aoyama, M. Hayakawa, T. Kinoshita and M. Nio

    Physical Review Letter   Vol. 99   page: 110406   2007.9

     More details

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

    This paper reports the value for the magnitude of the magnetic dipole moment of a single electron to an accuracy of 1/1,000,000,000,000. It is well-known that an electron carries an electric charge. Together with its nonzero spin, this electric charge induces the magnetic dipole. The magnitude of the magnetic dipole moment can be calculated based on quantum electrodynamics (QED). We carry out the eighth-order perturbative calculation in QED. Using the latest value of magnetic dipole moment
    measured by a Harvard group, we obtain the best value for the fine structure constant, which represents the magnitude of the elementary process
    for the electric force.

  15. *Determination of light quark masses from the electromagnetic splitting of pseudoscalar meson masses computed with two-flavors of domain wall fermions Reviewed

    T. Blum, T. Doi, M. Hayakawa, T. Izubuchi, N. Yamada

    Physical Review D   Vol. 76   page: 114508   2007.8

     More details

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

    We determine the values of up and down quarks from the lattice (QCD + QED) simulations formulated with domain wall fermions.

  16. Proper Eighth-Order Vacuum-Polarization Function and its Contribution to the Tenth-Order Lepton g-2 Reviewed

    T.Aoyama, M.Hayakawa, T.Kinoshita and M.Nio

    Physical Review D   Vol. 83 ( 5 ) page: 053053-1~053053-25   2011.3

     More details

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

    We computed the contribution to lepton g-2
    which is induced through the eighth-order one-particle irreducible corrections to the vacuum polarization function by numerical means.

    DOI: 10.1103/PhysRevD.83.053003

  17. Tenth-order lepton g-2: Contribution from diagrams containing a sixth-order light-by-light-scattering subdiagram internally Reviewed

    T.Aoyama, K.Asano, M.Hayakawa, T.Kinoshita, M.Nio and N.Watanabe

    Physical Review D   Vol. 81   page: 053009   2010.3

     More details

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

    This paper reports the result of our evaluation of the tenth-order QED correction to the lepton g-2 from Feynman diagrams which have sixth-order light-by-light-scattering subdiagrams, none of whose vertices couple to the external magnetic field. The gauge-invariant set of these diagrams, called Set II(e), consists of 180 vertex diagrams.

  18. Eighth-Order Vacuum-Polarization Function Formed by Two Light-by-Light-Scattering Diagrams and its Contribution to the Tenth-Order Electron g-2 Reviewed

    T.Aoyama, M.Hayakawa, T.Kinoshita, M.Nio and N.Watanabe

    Physical Review D   Vol. 78   page: 053005   2008.9

     More details

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

    We have evaluated the contribution to the anomalous magnetic moment of the electron from six tenth-order Feynman diagrams which contain eighth-order vacuum-polarization function formed by two light-by-light scattering diagrams connected by three photons. The integrals are constructed by two different methods. In the first method the subtractive counter terms are used to deal with ultraviolet (UV) singularities together with the requirement of gauge-invariance. In the second method, the Ward-Takahashi identity is applied to the light-by-light scattering amplitudes to eliminate UV singularities. Numerical evaluation confirms that the two methods are consistent with each other within their numerical uncertainties.

  19. Tenth-order lepton g-2: Contribution of some fourth-order radiative corrections to the sixth-order g-2 containing light-by-light-scattering subdiagrams Reviewed

    T.Aoyama, M.Hayakawa, T.Kinoshita and M.Nio

    Physical Review D   Vol. 82   page: 113004   2010.12

     More details

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

    We computed the contribution of tenth-order QED correction to lepton g-2, caused by the Feynman diagrams which are obtained as the fourth-order radiative correction to the sixth-order light-by-light scattering subdiagram.

  20. Tenth-Order QED contribution to Lepton Anomalous Magnetic Moment - Fourth-Order Vertices Containing Sixth-Order Vacuum-Polarization Subdiagrams Reviewed

    T.Aoyama,M.Hayakawa,T.Kinoshita and M.Nio

    Physical Review D   Vol. 83 ( 5 ) page: 053002-1~053002-16   2011.3

     More details

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

    We report the results for the tenth-order QED contribution to the electron g-2 and the muon g-2, induced from the Feynman diagrams which are obtained by inserting sixth-order vacuum polarization subdiagrams into the fourth-order vertex diagrams.

    DOI: 10.1103/PhysRevD.83.053002

  21. Tenth-Order Lepton Anomalous Magnetic Moment -- Sixth-Order Vertices Containing Vacuum-Polarization Subdiagrams Reviewed

    T.Aoyama,M.Hayakawa,T.Kinoshita and M.Nio

    Physical Review D   Vol. 84 ( 5 ) page: 053003-1~053003-5   2011.9

     More details

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

    We report the results for the tenth-order QED contribution to the electron g-2 and the muon g-2, induced from the Feynman diagrams which are obtained by inserting vacuum polarizations into the sixth-order vertex diagrams.

    DOI: 10.1103/PhysRevD.84.053003

  22. Tenth-Order Lepton Anomalous Magnetic Moment - Second-Order VertexContaining Two Vacuum Polarization Subdiagrams, One Within the Other Reviewed

    T.Aoyama, M.Hayakawa, T.Kinoshita and M.Nio

    Physical Review D   Vol. 78   page: 113006   2008.12

     More details

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

    This paper reports the tenth-order QED contribution to the g-2 of electron and muon from two gauge-invariant sets: Set I(g) and Set I(h). In the case of electron g-2, Set I(g) consists of nine Feynman diagrams which have a fourth-order vacuum-polarization loop containing another fourth-order vacuum-polarization loop. Set I(h) consists of 30 Feynman diagrams which have a proper sixth-order vacuum-polarization loop containing a second-order vacuum-polarization loop.

  23. Tenth-Order QED Lepton Anomalous Magnetic Moment --- Eighth-Order Vertices Containing a Second-Order Vacuum Polarization Reviewed

    T.Aoyama,M.Hayakawa,T.Kinoshita and M.Nio

    Physical Review D   Vol. 85 ( 3 ) page: 033007-1~033007-17   2012.2

     More details

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

    We report the results for the tenth-order QED contribution to the lepton g-2, induced from the Feynman diagrams which are obtained by inserting the vacuum polarization subdiagram into the eighth-order vertex diagrams.

    DOI: 10.1103/PhysRevD.85.033007

  24. Tenth-Order QED Contribution to the Lepton Anomalous Magnetic Moment -- Sixth-Order Vertices Containing an Internal Light-by-Light-Scattering Subdiagram Reviewed

    T.Aoyama,M.Hayakawa,T.Kinoshita and M.Nio

    Physical Review D   Vol. 85 ( 9 ) page: 093013-1~093013-12   2012.5

     More details

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

    We report the results for the tenth-order QED contribution to the electron g-2 and the muon g-2, induced from the Feynman diagrams which are obtained by inserting the light-by-light scattering subdiagrams into the sixth-order vertex diagrams.

    DOI: 10.1103/PhysRevD.85.093013

  25. The anomalous magnetic moment of the muon in the Standard Model Reviewed International coauthorship

    T. Aoyama, N. Asmussen, M. Benayoun, J. Bijnens, T. Blum, M. Bruno, I. Caprini, C. M. Carloni Calame, M. Cè, G. Colangelo, F. Curciarello, H. Czyż, I. Danilkin, M. Davier, C. T. H. Davies, M. Della Morte, S. I. Eidelman, A. X. El-Khadra, A. Gérardin, D. Giusti, M. Golterman, Steven Gottlieb, V. Gülpers, F. Hagelstein, M. Hayakawa, G. Herdoíza, D. W. Hertzog, A. Hoecker, M. Hoferichter, B.-L. Hoid, R. J. Hudspith, F. Ignatov, T. Izubuchi, F. Jegerlehner, L. Jin, A. Keshavarzi, T. Kinoshita, B. Kubis, A. Kupich, A. Kupść, L. Laub, C. Lehner, L. Lellouch, I. Logashenko, B. Malaescu, K. Maltman, M. K. Marinković, P. Masjuan, A. S. Meyer, H. B. Meyer, T. Mibe, K. Miura, S. E. Müller, M. Nio, D. Nomura, A. Nyffeler, V. Pascalutsa, M. Passera, E. Perez del Rio, S. Peris, A. Portelli, M. Procura, C. F. Redmer, B. L. Roberts, P. Sánchez-Puertas, S. Serednyakov, B. Shwartz, S. Simula, D. Stöckinger, H. Stöckinger-Kim, P. Stoffer, T. Teubner, R. Van de Water, M. Vanderhaeghen, G. Venanzoni, G. von Hippel, H. Wittig, Z. Zhang, M. N. Achasov, A. Bashir, N. Cardoso, B. Chakraborty, E.-H. Chao, J. Charles, A. Crivellin, O. Deineka, A. Denig, C. DeTar, C. A. Dominguez, A. E. Dorokhov, V. P. Druzhinin, G. Eichmann, M. Fael, C. S. Fischer, E. Gámiz, Z. Gelzer, J. R. Green, S. Guellati-Khelifa, D. Hatton, N. Hermansson-Truedsson et al. (32 additional authors not shown)

    Physics Reports   Vol. 887 ( 3 ) page: 1 - 166   2020.12

     More details

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

    DOI: 10.1016/j.physrep.2020.07.006

    Other Link: https://arxiv.org/pdf/2006.04822.pdf

  26. The anomalous magnetic moment of the muon in the Standard Model

    Aoyama T., Asmussen N., Benayoun M., Bijnens J., Blum T., Bruno M., Caprini I, Calame C. M. Carloni, Ce M., Colangelo G., Curciarello F., Czyz H., Danilkin I, Davier M., Davies C. T. H., Della Morte M., Eidelman S. I, El-Khadra A. X., Gerardin A., Giusti D., Golterman M., Gottlieb Steven, Gulpers V, Hagelstein F., Hayakawa M., Herdoiza G., Hertzog D. W., Hoecker A., Hoferichter M., Hoid B-L, Hudspith R. J., Ignatov F., Izubuchi T., Jegerlehner F., Jin L., Keshavarzi A., Kinoshita T., Kubis B., Kupich A., Kupsc A., Laub L., Lehner C., Lellouch L., Logashenko I, Malaescu B., Maltman K., Marinkovic M. K., Masjuan P., Meyer A. S., Meyer H. B., Mibe T., Miura K., Muller S. E., Nio M., Nomura D., Nyffeler A., Pascalutsa V, Passera M., del Rio E. Perez, Peris S., Portelli A., Procura M., Redmer C. F., Roberts B. L., Sanchez-Puertas P., Serednyakov S., Shwartz B., Simula S., Stoeckinger D., Stoeckinger-Kim H., Stoffer P., Teubner T., Van de Water R., Vanderhaeghen M., Venanzoni G., von Hippel G., Wittig H., Zhang Z., Achasov M. N., Bashir A., Cardoso N., Chakraborty B., Chao E-H, Charles J., Crivellin A., Deineka O., Denig A., DeTar C., Dominguez C. A., Dorokhov A. E., Druzhinin V. P., Eichmann G., Fael M., Fischer C. S., Gamiz E., Gelzer Z., Green J. R., Guellati-Khelifa S., Hatton D., Hermansson-Truedsson N., Holz S., Horz B., Knecht M., Koponen J., Kronfeld A. S., Laiho J., Leupold S., Mackenzie P. B., Marciano W. J., McNeile C., Mohler D., Monnard J., Neil E. T., Nesterenko A. V, Ottnad K., Pauk V, Radzhabov A. E., de Rafael E., Raya K., Risch A., Rodriguez-Sanchez A., Roig P., San Jose T., Solodov E. P., Sugar R., Todyshev K. Yu, Vainshtein A., Aviles-Casco A. Vaquero, Weil E., Wilhelm J., Williams R., Zhevlakov A. S.

    PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS   Vol. 887   page: 1 - 166   2020.12

  27. Hadronic Light-by-Light Scattering Contribution to the Muon Anomalous Magnetic Moment from Lattice QCD

    Blum Thomas, Christ Norman, Hayakawa Masashi, Izubuchi Taku, Jin Luchang, Jung Chulwoo, Lehner Christoph

    PHYSICAL REVIEW LETTERS   Vol. 124 ( 13 )   2020.4

  28. Using infinite volume, continuum QED and lattice QCD for the hadronic light-by-light contribution to the muon anomalous magnetic moment Reviewed

    T.Blum, N.Christ, M.Hayakawa, T.Izubuchi, L.Jin, C.Jung, C.Lehner

    Physical Review D   Vol. 96 ( 3 ) page: 034515   2017.8

     More details

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

    DOI: 10.1103/PhysRevD.96.034515

    arXiv

  29. The connected and leading disconnected diagrams of the hadronic light-by-light contribution to muon g - 2 Reviewed

    L.Jin, T.Blum, N.Christ, M.Hayakawa, T.Izubuchi, C.Jung and C.Lehner

    Proceedings of Science   Vol. LATTICE2016   page: 181   2017

     More details

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

    arXiv

  30. On calculating disconnected-type hadronic light-by-light scattering diagrams from lattice QCD Reviewed

    M.Hayakawa, T.Blum, N.H.Christ, T.Izubuchi, L.C.Jin and C.Lehner

    Pos LATTICE   Vol. 2015   page: 104   2016

     More details

    Authorship:Lead author   Language:English  

    For reliable comparison of the standard model prediction to the muon g-2 with its experimental value, the hadronic light-by-light scattering (HLbL) contribution must be calculated by lattice QCD simulation. HLbL contribution has many types of disconnected-type diagrams. Here, we start with recalling the point that must be taken care of in every method to calculate them by lattice QCD, and present one concrete method called nonperturbative QED method.

    arXiv

  31. Hadronic Light by Light Contributions to the Muon Anomalous Magnetic Moment With Physical Pions Reviewed

    L.Jin, T.Blum, N.Christ, M.Hayakawa, T.Izubuchi and C.Lehner

    PoS LATTICE   Vol. 2015   page: 103   2016

     More details

    Language:English  

    We will describe how lattice methods are well-suited to provide a first-principle's result for the hadronic light by light contribution, the various numerical strategies that are presently being used to evaluate it, our current results and the important remaining challenges which must be overcome.

    arXiv

  32. The connected and leading disconnected diagrams of the hadronic light-by-light contribution to muon g - 2 Reviewed

    L.Jin, T.Blum, N.Christ, M.Hayakawa, T.Izubuchi, C.Jung, C.Lehner

    Proceedings of Science, LATTICE   Vol. 2016   page: 181   2016

     More details

    Language:English  

    arXiv

  33. Lattice Study on quantum-mechanical dynamics of two-color QCD with six light flavors Reviewed

    M.Hayakawa, K.-I.Ishikawa, S.Takeda, M.Tomii and N.Yamada

    Physical Review D   Vol. 88 ( 9 ) page: 094506   2013.11

     More details

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

    DOI: 10.1103/PhysRevD.88.094506

  34. Running coupling constant and mass anomalous dimension of six-flavor SU(2) gauge theory Reviewed

    M.Hayakawa, K.-I.Ishikawa, S.Takeda and N.Yamada

    Physical Review D   Vol. 88 ( 9 ) page: 094504   2013.11

     More details

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

    DOI: 10.1103/PhysRevD.88.094504

  35. Non-degenerate light quark masses from 2+1f lattice QCD+QED

    S.Drury, T.Blum, M.Hayakawa, T.Izubuchi, C.Sachrajda and R.Zhou

    Proceedings of Science, LATTICE   Vol. 2013   page: 268   2013

     More details

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

  36. Lattice study on chiral dynamics of two-color six-flavors QCD

    M.Tomii, M.Hayakawa, K.I.Ishikawa, S.Takeda and N.Yamada

    Proceedings of Science, LATTICE   Vol. 2013   page: 068   2013

     More details

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

  37. Update on the hadronic light-by-light contribution to the muon g-2 and inclusion of dynamically charged sea quarks

    T.Blum, M.Hayakawa and T.Izubuchi

    Proceedings of Science   Vol. 2013   page: 439   2013

     More details

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

  38. Quantum electrodynamics calculation of lepton anomalous magnetic moments: Numerical approach to the perturbation theory of QED Invited Reviewed

    T. Aoyama, M. Hayakawa, T. Kinoshita and M. Nio

    Progress of Theoretical and Experimental Physics   Vol. 2012   page: 01A107   2012.11

     More details

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

    In this review, we summarize the results of our numerical work carried out over nearly ten years on the complete determination of the 10th-order contribution to the anomalous magnetic moments of leptons in the perturbation theory of quantum electrodynamics. Our approach is based on a reorganized renormalization method in which no divergent quantities appear explicitly in any part of the calculation, which is crucial for the feasibility of numerical integration. The enormous number of 10th-order diagrams and the complexity of the renormalization procedure are such that we could not have handled this problem without the development of an automated code-generating algorithm. The systematic approach to these problems is described in some detail.

    DOI: 10.1093/ptep/pts030

  39. Hadronic corrections to the muon anomalous magnetic moment from lattice QCD

    T.Blum, M.Hayakawa and T.Izubuchi

      Vol. 2012   page: 040   2012

     More details

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

    After a brief self-contained introduction to the muon anomalous magnetic momen, we review the status of lattice calculations of the hadronic vacuum polarization contribution and present first results from lattice QCD for the hadronic light-by-light scattering contribution. The signal for the latter is consistent with model calculations. While encouraging, the statistical error is large and systematic errors are mostly uncontrolled. The method is applied first to pure QED as a check.

  40. lattice study on two-color QCD with six flavors of dynamical quarks

    M.Hayakawa, K.-I.~Ishikawa, Y.Osaki, S.Takeda and N.Yamada

    PoS LATTICE   Vol. 2012   page: 040   2012

     More details

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

    We study the dynamics of SU(2) gauge theory with six Dirac fermions by means of lattice simulation to investigate if they are appropriate to realization of electroweak symmetry breaking. The discrete analogue of beta function for the running coupling constant defined under the Schrödinger functional boundary condition are computed on the lattices up to linear size of L/a = 24 and preclude the existence of infrared fixed point below g2 ~ 7.6. Gluonic observables such as heavy quark potential, string tension, Polyakov loop suggest that the target system is in the confining phase even in the massless quark limit.

▼display all

Books 1

  1. Theory of Anomalous Magnetic Dipole Moments of the Electron

    Masashi Hayakawa( Role: Sole author)

    Springer  2014.1 

     More details

    Language:English

KAKENHI (Grants-in-Aid for Scientific Research) 4

  1. Anomalous magnetic dipole moment of lepton from quantum electrodynamics

    2004.10

    Grant-in-Aid for Scientific Research 

      More details

    Authorship:Coinvestigator(s) 

  2. ミュー粒子異常磁気能率におけるQCD効果の理解

    2020.4 - 2023.3

    科学研究費補助金 

      More details

    Authorship:Principal investigator 

  3. ミュー粒子の異常磁気能率におけるQCD力学の格子計算方法の開拓

    2013.4 - 2016.3

    科学研究費補助金 

    早川雅司

      More details

    Authorship:Principal investigator 

    素粒子の標準模型の精密検証を推進する上で、ミュー粒子の異常磁気能率も一つの有効な量である。ただし、現時点では、クォーク、及びそれらを結びつける強い相互作用のゲージ理論であるQCDの非摂動かる量子論的な力学に関する定量性の欠如に由来する理論的不定性が大きく、検証の精密化を図る上で最も大きな障害となっている。本研究の目的は、このQCDの力学を数値シミュレーションにより評価する上で実際的な方法を開拓することである。その上で、ミュー粒子の異常磁気能率が未知の素粒子構造の存在を感知する物理量として役割を果たすために必要な精度で、同寄与からの予言値を得ることを目標をする。

  4. ゲージ理論の量子論的力学の解明                         

    2008

    科学研究費補助金  基盤研究(C),課題番号:20540261

    早川 雅司

      More details

    Authorship:Principal investigator 

 

Teaching Experience (On-campus) 48

  1. 素粒子物理学2

    2022

  2. 場の理論1

    2022

  3. 場の理論2

    2022

  4. 素核セミナー1

    2022

  5. 素粒子宇宙物理学セミナー5

    2022

  6. 素粒子物理学2

    2021

  7. Seminar in particle physics and Astrophysics 5

    2021

  8. 素核セミナー1

    2021

  9. 場の理論2

    2021

  10. 場の理論1

    2021

  11. 素粒子物理学2/場の理論1

    2020

  12. 素核セミナー

    2020

  13. 場の理論2

    2020

  14. 場の理論2

    2019

  15. 素核セミナー

    2019

  16. 素粒子物理学2/場の理論1

    2019

  17. 場の理論2

    2018

  18. 素核セミナー

    2018

  19. 素粒子物理学2/場の理論1

    2018

  20. 場の理論2

    2017

  21. 素粒子物理学2/場の理論1

    2017

  22. 素核セミナー

    2017

  23. 場の理論2

    2016

  24. 素核セミナー

    2016

  25. 素粒子物理学2/場の理論1

    2016

  26. 場の理論2

    2015

  27. 素核セミナー

    2015

  28. 素粒子物理学2/場の理論1

    2015

  29. 場の理論2

    2014

  30. 素粒子物理学2/場の理論1

    2014

  31. 素核セミナー

    2014

  32. 場の理論2

    2013

     詳細を見る

    素粒子物理学2/場の理論1に引き続き、場の量子論に関する基礎的事項を学ぶ。

  33. 素核セミナー

    2013

     詳細を見る

    ゼミ形式で場の量子論の基礎に関する基礎を習得していく。

  34. 素粒子物理学2/場の理論1

    2013

     詳細を見る

    素粒子物理学の理論研究を推進する上での「言語/文法」である「場の量子論」の概念と基礎を学ぶ。

  35. 基礎セミナーB

    2012

  36. Quantum field theory II

    2012

  37. Quantum field theory II

    2012

  38. elementary particle physics II / field theory I

    2012

  39. 場の理論2

    2011

  40. 場の理論1

    2011

  41. 基礎セミナーA

    2009

  42. advanced course of physics I

    2009

  43. elementary particle physics I

    2009

  44. 素粒子物理学Ⅰ

    2008

  45. Seminar on elementary particle physics and nuclear physics

    2008

  46. Elementary Particle Physics (A)

    2008

  47. seminar on elementary particle physics and nulear physics

    2007

  48. 素粒子物理学Ⅰ

    2007

▼display all