Faculty Profiles - IIJIMA, Toru

Papers - IIJIMA, Toru

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First muon acceleration using a radio-frequency accelerator

Bae S, Choi H, Choi S, Fukao Y, Futatsukawa K, Hasegawa K, Iijima T, Iinuma H, Ishida K, Kawamura N, Kim B, Kitamura R, Ko H. S, Kondo Y, Li S, Mibe T, Miyake Y, Morishita T, Nakazawa Y, Otani M, Razuvaev G. P, Saito N, Shimomura K, Sue Y, Won E, Yamazaki T

PHYSICAL REVIEW ACCELERATORS AND BEAMS Vol. 21 ( 5 ) 2018.5

Production cross sections of hyperons and charmed baryons from e(+)e(-) annihilation near root s=10.52 GeV

Niiyama M, Sumihama M, Nakano T, Adachi I, Aihara H, Al Said S, Asner D. M, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bakich A. M, Bansal V, Barberio E, Berger M, Bhardwaj V, Bhuyan B, Biswal J, Bobrov A, Bonvicini G, Bozek A, Bracko M, Browder T. E, Cervenkov D, Chang M. -C, Chekelian V, Chen A, Cheon B. G, Chilikin K, Chistov R, Cho K, Choi Y, Cinabro D, Dash N, Di Carlo S, Dolezal Z, Drasal Z, Dutta D, Eidelman S, Farhat H, Fast J. E, Ferber

PHYSICAL REVIEW D Vol. 97 ( 7 ) 2018.4

Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society (APS)

We measure the inclusive production cross sections of hyperons and charmed baryons from e⁺e⁻ annihilation using a 800 fb⁻¹ data sample taken near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e⁺e⁻ collider. The feed-down contributions from heavy particles are subtracted using our data, and the direct production cross sections are presented for the first time. The production cross sections divided by the number of spin states for S= -1 hyperons follow an exponential function with a single slope parameter except for the Σ(1385)⁺ resonance. Suppression for Σ(1385)⁺ and Ξ(1530)⁰ hyperons is observed. Among the production cross sections of charmed baryons, a factor of 3 difference for Λc⁺ states over Σc states is observed. This observation suggests a diquark structure for these baryons.

DOI： 10.1103/PhysRevD.97.072005

Web of Science

Observation of Xi(c)(2930)(0) and updated measurement of B- -> K- Lambda(+)(c)(Lambda)over-bar(c)(-) at Belle

Li Y. B, Shen C. P, Adachi I, Ahn J. K, Aihara H, Al Said S, Asner D. M, Aushev T, Ayad R, Babu V, Badhrees I, Bakich A. M, Ban Y, Bansal V, Behera P, Berger M, Bhardwaj V, Bhuyan B, Biswal J, Bonvicini G, Bozek A, Bracko M, Browder T. E, Cervenkov D, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S. -K, Choi Y, Cinabro D, Cunliffe S, Dash N, Di Carlo S, Dolezal Z, Drasal Z, Eidelman S, Epifanov D, Fast J. E, Ferber T, Fulsom B. G, Garg R., Gau

EUROPEAN PHYSICAL JOURNAL C Vol. 78 ( 3 ) 2018.3

Study of K-S(0) pair production in single-tag two-photon collisions

Masuda M, Uehara S, Watanabe Y, Adachi I, Ahn J. K, Aihara H, Al Said S, Asner D. M, Atmacan H, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bansal V, Behera P, Berger M, Bhardwaj V, Bhuyan B, Biswal J, Bondar A, Bonvicini G, Bozek A, Bracko M, Cervenkov D, Chen A, Cheon B. G, Chilikin K, Cho K, Choi Y, Choudhury S, Cinabro D, Czank T, Dash N, Di Carlo S, Dolezal Z, Drasal Z, Dutta D, Eidelman S, Epifanov D, Fast J. E, Ferber T, Fulsom B. G, Garg

PHYSICAL REVIEW D Vol. 97 ( 5 ) 2018.3

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

We report a measurement of the cross section for K-S(0) pair production in single-tag two-photon collisions, gamma*gamma -> (KSKS0)-K-0, for Q(2) up to 30 GeV2, where Q(2) is the negative of the invariant mass squared of the tagged photon. The measurement covers the kinematic range 1.0 GeV < W < 2.6 GeV and vertical bar cos theta*vertical bar < 1.0 for the total energy and kaon scattering angle, respectively, in the gamma*gamma center-of-mass system. These results are based on a data sample of 759 fb(-1) collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. For the first time, the transition form factor of the f'(2)(1525) meson is measured separately for the helicity-0, -1, and -2 components and also compared with theoretical calculations. We have derived the cross section for the process for W < 2.6 GeV from 121 signal candidate events. Finally, the gamma*gamma partial decay widths of the chi(c0) and chi(c2) mesons are measured as a function of Q(2) based on 10 candidate events in total.

DOI： 10.1103/PhysRevD.97.052003

Web of Science

Measurement of branching fractions of hadronic decays of the Omega(0)(c) baryon

Yelton J, Adachi I, Aihara H, Al Said S, Asner D. M, Atmacan H, Aulchenko V, Aushev T, Ayad R, Aziz T, Babu V, Bakich A. M, Bansal V, Behera P, Berger M, Bhardwaj V, Biswal J, Bobrov A, Bondar A, Bozek A, Bracko M, Browder T. E, Cervenkov D, Chang M. -C, Chang P, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S. -K, Choi Y, Choudhury S, Cinabro D, Czank T, Dash N, Di Carlo S, Dolezal Z, Eidelman S, Fast J. E, Ferber T, Fulsom B. G, Garg R., Gau

PHYSICAL REVIEW D Vol. 97 ( 3 ) 2018.2

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

Using a data sample of 980 fb(-1) of e(+)e(-) annihilation data taken with the Belle detector operating at the KEKB asymmetric-energy e(+)e(-) collider, we report the results of a study of the decays of the Omega(0)(c) charmed baryon into hadronic final states. We report the most precise measurements to date of the relative branching fractions of the Omega(0)(c) into Omega(-)pi(+)pi(0), Omega(-)pi(+)pi(-)pi(+), Xi K--(-)pi(+)pi(+), and Xi K-0(-)pi(+), as well as the first measurements of the branching fractions of the Omega(0)(c) into Xi(-)(K) over bar (0)pi(+), Xi(0)(K) over bar (0), and Lambda(K) over bar (0)(K) over bar (0), all with respect to the Omega(-)pi(+) decay. In addition, we investigate the resonant substructure of these modes. Finally, we present a limit on the branching fraction for the decay Omega(0)(c) -> Sigma+K-K-pi(+).

DOI： 10.1103/PhysRevD.97.032001

Web of Science

Measurement of the tau Michel parameters (eta)over-bar and xi kappa in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu)over-bar(l)gamma

Shimizu N, Aihara H, Epifanov D, Adachi I, Al Said S, Asner D. M, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bakich A. M, Bansal V, Barberio E, Bhardwaj V, Bhuyan B, Biswal J, Bobrov A, Bozek A, Bracko M, Browder T. E, Cervenkov D, Chang M. -C, Chang P, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S. -K, Choi Y, Cinabro D, Czank T, Dash N, Di Carlo S, Dolezal Z, Dutta D, Eidelman S, Fast J. E, Ferber T, Fulsom B. G, Garg R, Gaur V., G

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS Vol. 2018 ( 2 ) 2018.2

Measurements of the absolute branching fractions of B+ -> Xc(c)over-barK(+) and B+ -> (D)over-bar((*)0)pi(+) at Belle

Kato Y, Iijima T, Adachi I, Aihara H, Al Said S, Asner D. M, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bakich A. M, Bansal V, Barberio E, Behera P, Bhardwaj V, Bhuyan B, Biswal J, Bozek A, Bracko M, Browder T. E, Cervenkov D, Chang P, Cheaib R, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S. -K, Choi Y, Cinabro D, Czank T, Dash N, Di Carlo S, Dolezal Z, Drasal Z, Dutta D, Eidelman S, Epifanov D, Fast J. E, Ferber T, Fulsom B. G., Gau

PHYSICAL REVIEW D Vol. 97 ( 1 ) 2018.1

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

We present the measurement of the absolute branching fractions of B+ -> Xc (c) over barK+ and B+ -> (D) over bar ((*)0)pi(+) decays, using a data sample of 772 x 10(6) B (B) over bar pairs collected at the gamma(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. Here, X-c (c) over bar denotes eta(c), J/psi, chi(c0), chi(c1), eta(c) (2S), psi(2S), psi(3770), X(3872), and X(3915). We do not observe significant signals for X(3872) or X(3915) and set the 90% confidence level upper limits at B(B+ -> X(3872)K+) < 2.6 x 10(-4) and B(B+ -> X(3915)K+) < 2.8 x 10(-4). These represent the most stringent upper limit for B(B+ -> X(3872)K+) to date and the first limit for B(B+ -> X(3915)K+). The measured branching fractions for eta(c) and eta(c)(2S) are the most precise to date, B(B+ -> eta K-c(+)) = (12.0 +/- 0.8 +/- 0.7) x 10(-4) and B(B+ -> eta(c)(2S)K+) = (4.8 +/- 1.1 +/- 0.3) x 10(-4), where the first and second uncertainties are statistical and systematic, respectively.

DOI： 10.1103/PhysRevD.97.012005

Web of Science

Measurement of the tau lepton polarization and R(D*) in the decay (B)over-bar -> D*tau(-)(nu)over-bar(tau) with one-prong hadronic tau decays at Belle

Hirose S, Iijima T, Adachi I, Adamczyk K, Aihara H, Al Said S, Asner D. M, Atmacan H, Aushev T, Ayad R, Aziz T, Babu V, Badhrees I, Bakich A. M, Bansal V, Berger M, Bhardwaj V, Bhuyan B, Biswal J, Bondar A, Bozek A, Bracko M, Browder T. E, Cervenkov D, Chang M. -C, Chang P, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S. -K, Choi Y, Choudhury S, Cinabro D, Czank T, Dash N, Di Carlo S, Dolezal Z, Dutta D, Eidelman S, Fast J. E, Ferber T, Fuls

PHYSICAL REVIEW D Vol. 97 ( 1 ) 2018.1

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

With the full data sample of 772 x 10(6) B (B) over bar pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay (B) over bar -> D+ tau(-)(nu) over bar (tau) is studied with the hadronic tau decays tau(-) -> pi(-)nu(tau) and tau(-) -> rho(-)nu(tau). The tau polarization P-tau(D*) in two-body hadronic tau decays is measured, as well as the ratio of the branching fractions R(D*) = B((B) over bar -> D*tau(-) (nu) over bar (tau))/B((B) over bar -> D*l(-) (nu) over bar (l),where l(-) denotes an electron or a muon. Our results, P-tau (D*) = - 0.38 +/- 0.51(stat)(+0.21)(-0.16) (syst) and R(D*) = 0.270 +/- 0.035(stat)(+0.028)(-0.025)(syst), are consistent with the theoretical predictions of the standard model. The polarization values of P-tau(D*) > +0.5 are excluded at the 90% confidence level.

DOI： 10.1103/PhysRevD.97.012004

Web of Science

Muon Profile Measurement After Acceleration With a Radio-Frequency Quadrupole linac

Otani M., Sue Y., Fukao Y., Futatsukawa K., Kawamura N., Mibe T., Miyake Y., Shimomura K., Yamazaki T., Iijima T., Bae, Choi H., Choi S., Kim B., Ko H. S., Hasegawa K., Kondo Y., Morishita T., Iinuma H., Nakazawa Y., Ishida K., Kitamura R., Li S., Razuvaev G. P., Saito N., Won E.

9TH INTERNATIONAL PARTICLE ACCELERATOR CONFERENCE (IPAC18) Vol. 1067 2018

SuperKEKB/Belle II実験の物理

飯嶋徹

日本加速器学会誌 Vol. 15 page： 221 - 228 2018

Extension of the MCP-PMT lifetime

Matsuoka K, Hirose S, Iijima T, Inami K, Kato Y, Kobayashi K, Maeda Y, Omori R, Suzuki K

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 876 page： 93-95 - 95 2017.12

Search for light tetraquark states in Upsilon(1S) and Upsilon(2S) decays

Jia S, Shen C. P, Yuan C. Z, Adachi I, Ahn J. K, Aihara H, Al Said S, Asner D. M, Atmacan H, Aushev T, Ayad R, Babu V, Badhrees I, Bahinipati S, Bakich A. M, Bansal V, Behera P, Berger M, Bhardwaj V, Bhuyan B, Biswal J, Bonvicini G, Bozek A, Bracko M, Browder T. E, Cervenkov D, Chang M. -C, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S. -K, Choi Y, Cinabro D, Czank T, Dash N, Di Carlo S, Dolezal Z, Dutta D, Eidelman S, Epifanov D, Fast J. E

PHYSICAL REVIEW D Vol. 96 ( 11 ) 2017.12

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

We search for the J(PC) = 0(--) and 1(+-) light tetraquark states with masses up to 2.46 GeV/c(2) in gamma(1S) and gamma(2S) decays with data samples of (102 +/- 2) million and (158 +/- 4) million events, respectively, collected with the Belle detector. No significant signals are observed in any of the studied production modes, and 90% credibility level (C. L.) upper limits on their branching fractions in Upsilon(1S) and Upsilon(2S) decays are obtained. The inclusive branching fractions of the Upsilon(1S) and Upsilon(2S) decays into final states with f(1)(1285) are measured to be B(Upsilon(1S) -> f(1)(1285) + anything) = (46 +/- 28(stat) +/- 13(syst)) x 10(-4) and B(Upsilon(2S) -> f(1)(1285) + anything) = (22 +/- 15(stat) +/- 6.3(syst)) x 10(-4). The measured chi(b2) -> J/Psi + anything branching fraction is measured to be (1.50 +/- 0.34(stat) +/- 0.22(syst)) x 10(-3), and 90% C. L. upper limits for the chi(b0;b1) -> J/Psi + anything branching fractions are found to be 2.3 x 10(-3) and 1.1 x 10(-3), respectively. For B(chi(b1) -> omega + anything), the branching fraction is measured to be (4.9 +/- 1.3(stat) +/- 0.6(syst) x 10(-2). All results reported here are the first measurements for these modes.

DOI： 10.1103/PhysRevD.96.112002

Web of Science

Measurement of the decays B -> eta lv(l) and B -> eta ' lv(l) in fully reconstructed events at Belle

Beleno C, Dingfelder J, Urquijo P, Aihara H, Al Said S, Asner D. M, Aushev T, Ayad R, Babu V, Badhrees I, Bakich A. M, Bansal V, Behera P, Bhuyan B, Biswal J, Bobrov A, Bracko M, Browder T. E, Cervenkov D, Chen A, Cheon B. G, Chistov R, Cho K, Choi S. -K, Choi Y, Cinabro D, Dash N, Di Carlo S, Dolezal Z, Eidelman S, Farhat H, Fast J. E, Ferber T, Frey A, Fulsom B. G, Gaur V, Gabyshev N, Garmash A, Gillard R, Goldenzweig P, Hara T, Hayashii H, Hedges M. T

PHYSICAL REVIEW D Vol. 96 ( 9 ) 2017.11

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

We report branching fraction measurements of the decays B+ -> eta l(+)v(l) and B+ -> eta'l(+)v(l) based on 711 fb(-1) of data collected near the (sic)(4S) resonance with the Belle experiment at the KEKB asymmetric-energy e(+)e(-) collider. This data sample contains 772 million B (B) over bar events. One of the two B mesons is fully reconstructed in a hadronic decay mode. Among the remaining ("signal-B") daughters, we search for the eta meson in two decay channels, eta -> gamma gamma and eta -> pi(+)pi(-)pi(0), and reconstruct the eta' meson in eta' -> eta pi(+)pi(-) with subsequent decay of the eta into gamma gamma Combining the two. modes and using an extended maximum likelihood, the B+ -> eta l(+)v(l) branching fraction is measured to be (4.2 +/- 1.1 (stat.) +/- 0.3 (syst.)) x 10(-5). For B+ -> eta l(+)v(l),we observe no significant signal and set an upper limit of 0.72 x 10(-4) at 90% confidence level.

DOI： 10.1103/PhysRevD.96.091102

Web of Science

Search for B -> h nu(nu)over-bar decays with semileptonic tagging at Belle

Grygier J, Goldenzweig P, Heck M, Adachi I, Aihara H, Al Said S, Asner D. M, Aushev T, Ayad R, Aziz T, Babu V, Badhrees I, Bahinipati S, Bakich A. M, Bansal V, Barberio E, Behera P, Bhuyan B, Biswal J, Bobrov A, Bondar A, Bonvicini G, Bozek A, Bracko M, Browder T. E, Chang P, Chekelian V, Chen A, Cheon B. G, Chilikin K, Chistov R, Cho K, Choi Y, Cinabro D, Dash N, Di Carlo S, Dolezal Z, Drasal Z, Dutta D, Eidelman S, Farhat H, Fast J. E, Ferber T., Fulso

PHYSICAL REVIEW D Vol. 96 ( 9 ) 2017.11

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

We present the results of a search for the rare decays B -> h nu(nu) over bar, where h stands for K+, K-S(0), K*(+); K*(0); pi(+); pi(0), rho(+) and rho(0). The results are obtained with 772 x 10(6) B (B) over bar pairs collected with the Belle detector at the KEKB e(+)e(-) collider. We reconstruct one B meson in a semileptonic decay and require a single h meson but nothing else on the signal side. We observe no significant signal and set upper limits on the branching fractions. The limits set on the B-0 -> K-S(0)nu(nu) over bar, B-0 -> K*(0)nu(nu) over bar, B+ -> pi(+)nu(nu) over bar, B-0 -> pi(0)nu(nu) over bar, B+ -> rho(+)nu(nu) over bar, and B-0 -> rho(0)nu(nu) over bar channels are the world's most stringent.

DOI： 10.1103/PhysRevD.96.091101

Web of Science

Evidence for Isospin Violation and Measurement of CP Asymmetries in B -> K*(892)gamma

Horiguchi T, Ishikawa A, Yamamoto H, Adachi I, Aihara H, Al Said S, Asner D. M, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bakich A. M, Bansal V, Behera P, Bhardwaj V, Bhuyan B, Biswal J, Bobrov A, Bonvicini G, Bozek A, Bracko M, Browder T. E, Cervenkov D, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi Y, Cinabro D, Czank T, Dash N, Di Carlo S, Dolezal Z, Drasal Z, Dutta D, Eidelman S, Epifanov D, Farhat H, Fast J. E, Ferber T, Fulsom B

PHYSICAL REVIEW LETTERS Vol. 119 ( 19 ) 2017.11

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

We report the first evidence for isospin violation in B -> K*gamma and the first measurement of the difference of CP asymmetries between B+->.K*(+)gamma and B-0 -> K-*0 gamma. This analysis is based on the data sample containing 772 x 10(6)BB pairs that was collected with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. We find evidence for the isospin violation with a significance of 3.1 sigma, Delta(0+) = [+6.2 +/- 1.5(stat) +/- 0.6(syst) +/- 1.2(f (+-)/f(00))] %, where the third uncertainty is due to the uncertainty on the fraction of B+B- to (BB0)-B-0 production in gamma(4S) decays. The measured value is consistent with predictions of the standard model. The result for the difference of CP asymmetries is Delta A(CP) = [+2.4 +/- 2.8(stat) +/- 0.5(syst)] %, consistent with zero. The measured branching fractions and CP asymmetries for charged and neutral B meson decays are the most precise to date. We also calculate the ratio of branching fractions of B-0 -> K-*0 gamma to B-s(0) -> phi gamma.

DOI： 10.1103/PhysRevLett.119.191802

Web of Science

Recent progress of divertor simulation research using the GAMMA 10/PDX tandem mirror

Nakashima Y, Ichimura K, Islam M. S, Sakamoto M, Ezumi N, Hirata M, Ichimura M, Ikezoe R, Imai T, Kariya T, Katanuma I, Kohagura J, Minami R, Numakura T, Yoshikawa M, Iijima T, Islam M. M, Nojiri K, Shimizu K, Terakado A, Togo S, Asakura N, Fukumoto M, Hatayama A, Hirooka Y, Kado S, Kubo H, Masuzaki S, Matsuura H, Nakano T, Nagata S, Nishino N, Ohno N, Sagara A, Sawada K, Shoji M, Tonegawa A, Ueda Y

NUCLEAR FUSION Vol. 57 ( 11 ) 2017.11

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

© 2017 IAEA, Vienna. This paper describes the recent progress in divertor simulation research using the GAMMA 10/PDX tandem mirror towards the development of divertors in fusion reactors. During a plasma flow generation experiment in the end cell of the GAMMA 10/PDX, ICRF heating in the anchor cell successfully extended the particle flux up to 3.3 1023 m2 s-1. Superimposing the short pulse of the ECH also attained a maximum heat flux of ∼30 MW m-2. We have succeeded in achieving and characterizing the detachment of the high-temperature plasma, which is equivalent to the SOL plasma of tokamaks, by using the divertor simulation experimental module (D-module) in the GAMMA 10/PDX end cell, in spite of using a linear device with a short magnetic field line connection length. Various gases (Ar, Xe, Ne and N2) are examined to evaluate the effect of radiation cooling against the plasma flow at the MW m-2 level in the divertor simulation region and the following results are obtained: (i) Xe gas was most effective in the reduction of heat and particle fluxes (1%, 3%, respectively) and has a stronger effect on electron cooling (down to ∼1.6 eV) in the used gas species. (ii) Ne gas was less effective. On the other hand, (iii) N2 gas showed more favorable effects than Ar in the lower pressure range. These results will contribute to the progress in detached plasma operation and in clarifying the radiation cooling mechanism towards the development of future divertors.

DOI： 10.1088/1741-4326/aa7cb4

Web of Science

Scopus

Search for CP Violation and Measurement of the Branching Fraction in the Decay D-0 -> (KSKS0)-K-0

Dash N, Bahinipati S, Bhardwaj V, Trabelsi K, Adachi I, Aihara H, Al Said S, Asner D. M, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bakich A. M, Bansal V, Barberio E, Bhuyan B, Biswal J, Bobrov A, Bondar A, Bonvicini G, Bozek A, Bracko M, Breibeck F, Browder T. E, Cervenkov D, Chang M. -C, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi Y, Cinabro D, Di Carlo S, Dolezal Z, Drasal Z, Dutta D, Eidelman S, Epifanov D, Farhat H, Fast J. E

PHYSICAL REVIEW LETTERS Vol. 119 ( 17 ) 2017.10

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

We report a study of the decay D-0 -> (KSKS0)-K-0 using 921 fb(-1) of data collected at or near the (sic)(4S) and (sic)(5S) resonances with the Belle detector at the KEKB asymmetric energy e(+)e(-) collider. The measured time-integrated CP asymmetry is A(CP)(D-0 -> (KSKS0)-K-0) = (-0.02 +/- 1.53 +/- 0.02 +/- 0.17)%, and the branching fraction is B(D-0 -> (KSKS0)-K-0) = (1.321 +/- 0.023 +/- 0.036 +/- 0.044) x 10(-4), where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode (D-0 -> K-S(0)pi(0)). These results are significantly more precise than previous measurements available for this mode. The A(CP) measurement is consistent with the standard model expectation.

DOI： 10.1103/PhysRevLett.119.171801

Web of Science

Study of eta and dipion transitions in Upsilon(4S) decays to lower bottomonia

Guido E, Mussa R, Tamponi U, Adachi I, Aihara H, Al Said S, Asner D. M, Aulchenko V, Aushev T, Ayad R, Badhrees I, Bakich A. M, Bansal V, Behera P, Bhardwaj V, Bhuyan B, Biswal J, Bobrov A, Bondar A, Bozek A, Bracko M, Browder T. E, Cervenkov D, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S. -K, Choi Y, Cinabro D, Dash N, Di Carlo S, Dolezal Z, Drasal Z, Eidelman S, Epifanov D, Farhat H, Fast J. E, Ferber T, Fulsom B. G, Gaur V, Gabyshev N

PHYSICAL REVIEW D Vol. 96 ( 5 ) 2017.9

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

We study hadronic transitions between bottomonium states using 496 fb(-1) data collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e(+)e(-) collider. We measure: B(Upsilon(4S) -> pi(+)pi(-)Upsilon(1S)) = (8.2 +/- 0.5(stat.)+/- 0.4(syst.)) x 10(-5), B(Upsilon(4S) -> pi(+)pi(-)Upsilon(2S)) = (7.9 +/- 1.0(stat.)+/- 0.4(syst.)) x 10(-5), and B(Upsilon(4S) -> eta Upsilon(1S)) = (1.70 +/- 0.23(stat.) +/- 0.08(syst.)) x 10(-4). We measure the ratio of branching fractions R=B(Upsilon(4S) -> eta Upsilon(1S))/B(Upsilon(4S) -> pi(+)pi(-)Upsilon(1S)) = 2.07 +/- 0.30(stat.)+/- 0.11(syst.). We search for the decay Upsilon(1(3)D(1,2)) -> eta Upsilon(1S), but do not find significant evidence for such a transition. We also measure the initial state radiation production cross sections of the Upsilon(2S,3S) resonances and we find values compatible with the expected ones. Finally, the analysis of the Upsilon(4S) -> pi(+)pi(-)Upsilon(1S) events shows indications for a resonant contribution due to the f(0)(980) meson.

DOI： 10.1103/PhysRevD.96.052005

Web of Science

Measurement of the branching fraction and CP asymmetry in B-0 -> pi(0)pi(0) decays, and an improved constraint on phi(2)

Julius T, Sevior M. E, Mohanty G. B, Adachi I, Aihara H, Al Said S, Asner D. M, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bakich A. M, Bansal V, Barberio E, Barrett M, Berger M, Bhardwaj V, Bhuyan B, Biswal J, Bloomfield T, Bobrov A, Bondar A, Bonvicini G, Bozek A, Bracko M, Browder T. E, Cervenkov D, Chang M-C, Chao Y, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi Y, Cinabro D, Dash N, Di Carlo S, Dolezal Z, Dossett D, Drasal Z, Dutta

PHYSICAL REVIEW D Vol. 96 ( 3 ) 2017.8

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

We measure the branching fraction and CP violation asymmetry in the decay B-0 -> pi(0)pi(0), using a data sample of 752 x 10(6) B (B) over bar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. The obtained branching fraction and direct CP asymmetry are B(B -> pi(0)pi(0)) = [1.31 +/- 0.19(stat) +/- 0.19(syst)] x 10(-6) and A(CP) = +0.14 +/- 0.36(stat) +/- 0.10(syst), respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle's earlier measurements of B-0 -> pi(+)pi(-) and B-+/- -> pi(+/-)pi(0) to exclude the CP-violating parameter phi(2) from the range 15.5 degrees < phi(2) < 75.0 degrees at 95% confidence level.

DOI： 10.1103/PhysRevD.96.032007

Web of Science

Invariant-mass and fractional-energy dependence of inclusive production of dihadrons in e(+) e(-) annihilation at root s=10.58 GeV

Seidl R, Adachi I, Aihara H, Al Said S, Asner D. M, Aushev T, Ayad R, Badhrees I, Bakich A. M, Bansal V, Behera P, Bhardwaj V, Bhuyan B, Biswal J, Bobrov A, Bozek A, Bracko M, Browder T. E, Cervenkov D, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S-K, Choi Y, Cinabro D, Dash N, Di Carlo S, Dolezal Z, Drasal Z, Eidelman S, Farhat H, Fast J. E, Ferber T, Fulsom B. G, Gaur V, Gabyshev N, Garmash A, Gillard R, Goldenzweig P, Guido E, Haba J, Hay

PHYSICAL REVIEW D Vol. 96 ( 3 ) 2017.8

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

The inclusive cross sections for dihadrons of charged pions and kaons (e(+)e(-) -> hhX) in electron-positron annihilation are reported. They are obtained as a function of the total fractional energy and invariant mass for any di-hadron combination in the same hemisphere as defined by the thrust event-shape variable and its axis. Since same-hemisphere dihadrons can be assumed to originate predominantly from the same initial parton, di-hadron fragmentation functions are probed. These di-hadron fragmentation functions are needed as an unpolarized baseline in order to quantitatively understand related spindependent measurements in other processes and to apply them to the extraction of quark transversity distribution functions in the nucleon. The di- hadron cross sections are obtained from a 655 fb(-1) data sample collected at or near the Y (4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider.

DOI： 10.1103/PhysRevD.96.032005

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