Faculty Profiles - IIJIMA, Toru

Papers - IIJIMA, Toru

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Open charm hadron spectroscopy at B-factories

Kato Y, Iijima T

PROGRESS IN PARTICLE AND NUCLEAR PHYSICS Vol. 105 page： 61-81 2019.3

First Measurements of Absolute Branching Fractions of the Xi(0)(c) Baryon at Belle

Li Y. B, Shen C. P, Yuan C. Z, Adachi I, Aihara H, Al Said S, Asner D. M, Aushev T, Ayad R, Badhrees I, Ban Y, Bansal V, Beleno C, Berger M, Bhardwaj V, Bhuyan B, Bilka T, Biswal J, Bondar A, Bozek A, Bracko M, Cao L, Cervenkov D, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S. -K, Choi Y, Cinabro D, Cunliffe S, Di Carlo S, Dolezal Z, Dong T. V, Drasal Z, Eidelman S, Fast J. E, Fulsom B. G, Garg R, Gaur V, Gabyshev N, Garmash A, Giri A, Goldenzweig P

PHYSICAL REVIEW LETTERS Vol. 122 ( 8 ) 2019.2

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

We present the first measurements of absolute branching fractions of Xi(0)(c) decays into Xi(-)pi(+), Lambda K-pi(+), and pK(-)K(-)pi(+) final states. The measurements are made using a dataset comprising (772 +/- 11) x 10(6) B (B) over bar pairs collected at the (sic)(4S) resonance with the Belle detector at the KEKB e(+)e(-)collider. We first measure the absolute branching fraction for B- -> (Lambda) over bar (-)(c)Xi(0)(c) using a missing-mass technique; the result is B(B- -> (Lambda) over bar (-)(c)Xi(0)(c)) = (9.51 +/- 2.10 +/- 0.88) x 10(-4). We subsequently measure the product branching fractions B(B- -> (Lambda) over bar (-)(c)Xi(0)(c))B(Xi(0)(c) -> Xi(-)pi(+)), B(B- -> (Lambda) over bar (-)(c)Xi(0)(c))B(Xi(0)(c) -> Lambda K-pi(+)), and B(B- -> (Lambda) over bar (-)(c)Xi(0)(c))B(Xi(0)(c) -> pK(-)K(-)pi(+)) with improved precision. Dividing these product branching fractions by the result for B- -> (Lambda) over bar (-)(c)Xi(0)(c) yields the following branching fractions: B(Xi(0)(c) -> Xi(-)pi(+)) = (1.80 +/- 0.50 +/- 0.14)%, B(Xi(0)(c) -> Lambda K-pi(+)) = (1.17 +/- 0.37 +/- 0.09)%, and B(Xi(0)(c) -> pK(-)K(-)pi(+) ) = 0.58 +/- 0.23 +/- 0.05)%. For the above branching fractions, the first uncertainties are statistical and the second are systematic. Our result for B(Xi(0)(c) -> Xi(-)pi(+)) can be combined with Xi(0)(c) branching fractions measured relative to Xi(0)(c) -> Xi(-)pi(+) to yield other absolute Xi(0)(c) branching fractions.

DOI： 10.1103/PhysRevLett.122.082001

Web of Science

Measurements of isospin asymmetry and difference of direct CP asymmetries in inclusive B -> X-s gamma decays

Watanuki S, Ishikawa A, Adachi I, Aihara H, Al Said S, Asner D. M, Aushev T, Ayad R, Babu V, Badhrees I, Bakich A. M, Bansal V, Behera P, Beleno C, Berger M, Bhardwaj V, Bhuyan B, Bilka T, Biswal J, Bobrov A, Bonvicini G, Bozek A, Bracko M, Browder T. E, Cao L, Cervenkov D, Chang P, Cheon B. G, Chilikin K, Cho K, Choi Y, Choudhury S, Cinabro D, Cunliffe S, Di Carlo S, Dingfelder J, Dong T. V, Eidelman S, Epifanov D, Fast J. E, Ferber T, Frey A, Fulsom B. G

PHYSICAL REVIEW D Vol. 99 ( 3 ) 2019.2

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

We report measurements of isospin asymmetry Delta(0-) and difference of direct CP asymmetries Delta A(CP) between charged and neutral B -> X-s gamma decays. This analysis is based on the data sample containing 772 x 10(6)B (B) over bar pairs that was collected with the Belle detector at the KEKB energy-asymmetric ethornecollider. Using a sum-of-exclusive technique with invariant X-s mass up to 2.8 GeV= c2, we obtain Delta(0-) = [0.48 +/- 1.49(stat) +/- 0.97(syst) +/- 1.15(f(+-)/f(00))]% and Delta A(CP) = [+3.69 +/- 2.65(stat) +/- 0.76(syst)]%, where the last uncertainty for.0-is due to the uncertainty on the production ratio of B+B- to B-0(B) over bar (0) in.o4Sthorn decays. The measured value of Delta(0-) is consistent with zero, allowing us to constrain the resolved photon contribution in the B -> X-s gamma, and improve the branching fraction prediction. The result for Delta A(CP) is consistent with the prediction of the SM. We also measure the direct CP asymmetries for charged and neutral B -> X-s gamma decays. All the measurements are the most precise to date.

DOI： 10.1103/PhysRevD.99.032012

Web of Science

Measurements of branching fraction and direct CP asymmetry in B-+/- -> (KSKSK +/-)-K-0-K-0 and a search for B-+/- -> (KSKS0)-K-0 pi(+/-)

Kaliyar A. B, Behera P, Mohanty G. B, Gaur V, Adachi I, Ahn J. K, Aihara H, Al Said S, Asner D. M, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bahinipati S, Bakich A. M, Bansal V, Beleno C, Bhardwaj V, Bilka T, Biswal J, Bobrov A, Bozek A, Bracko M, Cao L, Cervenkov D, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho H. E, Cho K, Choi S-K, Choi Y, Choudhury S, Cinabro D, Cunliffe S, Dash N, Di Carlo S, Dingfelder J, Dolezal Z, Dong T. V, Drasal Z, Eidelman

PHYSICAL REVIEW D Vol. 99 ( 3 ) 2019.2

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

We study charmless hadronic decays of charged B mesons to the final states (KSKSK +/-)-K-0-K-0 and (KSKS0)-K-0 pi(+/-) using a 711 fb(-1) data sample that contains 772 x 10(6) B (B) over bar pairs and was collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) ethorne-collider. For B-+/- -> (KSKSK +/-)-K-0-K-0, the measured branching fraction and direct CP asymmetry are [10.42 +/- 0.43(stat) +/- 0.22(syst)] x 10(-6) and [+1.6 +/- 3.9(stat) +/- 0.9(syst)] %, respectively. In the absence of a statistically significant signal for B-+/- -> (KSKS0)-K-0 pi(+/-), we obtain a 90% confidence-level upper limit on its branching fraction as 8.7 x 10(-7).

DOI： 10.1103/PhysRevD.99.031102

Web of Science

Observation of B+ -> p(Lambda)over-barK(+) K- and B+ -> (p)over-bar Lambda K+ K+

Lu P. -C, Wang M. -Z, Chistov R, Chang P, 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, Bakich A. M, Bansal V, Behera P, Beleno C, Berger M, Bhardwaj V, Bhuyan B, Bilka T, Biswal J, Bonvicini G, Bozek A, Bracko M, Browder T. E, Cao L, Cervenkov D, Chang M. -C, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S. -K, Choi Y, Choudhury S, Cinabro D, Cunliffe S, Dash N, Di Carlo S

PHYSICAL REVIEW D Vol. 99 ( 3 ) 2019.2

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

We report the study of B+ -> p (Lambda) over barK(+)K(-) and B+ -> (p) over barK(+)K(+) decays using a 772 x 10(6) B (B) over bar pair data sample recorded on the gamma(4S) resonance with the Belle detector at KEKB. The following branching fractions are measured: B(B+ -> p (Lambda) over barK(+)K(-)) = (4.10(-0.43)(+0.45) +/- 0.50) x 10(-6), B(B+ -> (p) over bar Lambda K+K+) = (3.70(-0.37)(+0.39) +/- 0.44) x 10(-6), B(eta(c) -> p (Lambda) over barK(-) + c.c.) = (2.83(-0.34)(+0.36) +/- 0.35) x 10(-3) and B(B+ -> p (Lambda) over bar phi) = (7.95 +/- 2.09 +/- 0.77) x 10(-7), where c.c. denotes the corresponding charge-conjugation process. The intermediate resonance decays are excluded in the four-body decay measurements. We also find evidence for B(eta(c) -> Lambda(1520)(Lambda) over bar + c.c.) = (3.48 +/- 1.48 +/- 0.46) x 10(-3) and B(B+-> Lambda(1520)(Lambda) over barK(+)) = (2.23 +/- 0.63 +/- 0.25) x 10(-6). No significant signals are found for J/psi -> Lambda(1520)(Lambda) over bar + c.c. and B+ -> (Lambda) over bar (1520)Lambda K+; we set the 90% confidence level upper limits on their decay branching fractions as < 1.80 x 10(-3) and < 2.08 x 10(-6), respectively.

DOI： 10.1103/PhysRevD.99.032003

Web of Science

Physics at the SuperKEKB/Belle II Experiment

Iijima Toru

Journal of the Particle Accelerator Society of Japan Vol. 15 ( 4 ) page： 221 - 228 2019.1

Language：Japanese Publisher：Particle Accelerator Society of Japan

The high luminosity e+e−collisions at the SuperKEKB accelerator produce heavy flavor particles, the B and D mesons as well as the τ lepton, at the rate of about 1010 particles/year with the designed luminosity of 8×1035 cm−2 s−1. These high statistics data provide rich physics programs at the Belle II experiment, to search for new phenomena beyond the Standard Model of particle physics. I present the physics program, recent status and prospect of the Belle II experiment.

DOI： 10.50868/pasj.15.4_221

CiNii Research

Search for CP violation with kinematic asymmetries in the D-0 -> K+K- pi(+)pi(-) decay

Kim J. B, Won E, Adachi I, Aihara H, Al Said S, Asner D. M, Atmacan H, Aulchenko V, Aushev T, Babu V, Badhrees I, Bahinipati S, Bakich A. M, Bansal V, Behera P, Beleno C, Bhuyan B, Bilka T, Biswal J, Bobrov A, Bozek A, Bracko M, Cao L, Cervenkov D, Chang P, 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, Dong T. V, Eidelman S, Epifanov D, Fast J. E, Ferber T, Frey A, Fulsom B

PHYSICAL REVIEW D Vol. 99 ( 1 ) 2019.1

Observation of Transverse Lambda/(Lambda)over-bar Hyperon Polarization in e(+)e(-) Annihilation at Belle

Guan Y, Vossen A, Adachi I, Adamczyk K, Ahn J. K, Aihara H, Al Said S, Asner D. M, Atmacan H, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bakich A. M, Bansal V, Behera P, Beleno C, Berger M, Bhardwaj V, Bhuyan B, Bilka T, Biswal J, Bobrov A, Bonvicini G, Bozek A, Bracko M, Browder T. E, Cao L, Cervenkov D, Chang P, 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, Dingfelder J, Dole

PHYSICAL REVIEW LETTERS Vol. 122 ( 4 ) 2019.1

Search for a Light CP-odd Higgs Boson and Low-Mass Dark Matter at the Belle Experiment

Seong I. S, Vahsen S. E, Adachi I, Aihara H, Al Said S, Asner D. M, Aulchenko V, Aushev T, Ayad R, Babu V, Bakich A. M, Bansal V, Behera P, Bhardwaj V, Bhuyan B, Bilka T, Biswal J, Bobrov A, Bonvicini G, Bozek A, Bracko M, Browder T. E, Cao L, Cervenkov D, Chang P, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi Y, Choudhury S, Cinabro D, Cunliffe S, Dash N, Di Carlo S, Dingfelder J, Dong T. V, Eidelman S, Epifanov D, Fast J. E, Frey A, Fulsom B. G

PHYSICAL REVIEW LETTERS Vol. 122 ( 1 ) 2019.1

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

We report on the first Belle search for a light CP-odd Higgs boson, A(0), that decays into low mass dark matter, chi, in final states with a single photon and missing energy. We search for events produced via the dipion transition (sic)(2S) -> (sic)(1S)pi(+)pi(-), followed by the on-shell process (sic)(1S) -> gamma A(0) with A(0) -> chi chi, or by the off-shell process (sic)(1S) -> gamma chi chi. Utilizing a data sample of 157.3 x 10(6) (sic)(2S) decays, we find no evidence for a signal. We set limits on the branching fractions of such processes in the mass ranges M-A0 < 8.97 GeV/c(2) and M-chi < 4.44 GeV/c(2). We then use the limits on the off-shell process to set competitive limits on WIMP-nucleon scattering in the WIMP mass range below 5 GeV/c(2).

DOI： 10.1103/PhysRevLett.122.011801

Web of Science

Negative Muonium Ion Production With a C12A7 Electride Film

Otani M, Fukao Y, Futatsukawa K, Kawamura N, Matoba S, Mibe T, Miyake Y, Shimomura K, Yamazaki T, Hasegawa K, Kitamura R, Kondo Y, Morishita T, Iijima T, Inami K, Sue Y, Yotsuzuka M, Iinuma H, Nakazawa Y, Ishida K, Saito N, Yasuda H

10TH INTERNATIONAL PARTICLE ACCELERATOR CONFERENCE Vol. 1350 2019

Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD

Negative muonium atom (mu(+) e(-) e(-) , Mu) has unique features stimulating potential interesting for several scientific fields. Since its discovery in late 1980's in vacuum, it has been discussed that the production efficiency would be improved using a low-work function material. C12A7 was a well-known insulator as a constituent of alumina cement, but was recently confirmed to exhibit electric conductivity by electron doping. The C12A7 electride has relatively low-work function (2.9 eV). In this paper, the negative muonium production measurement with several materials including a C12A7 electride film will be presented.

DOI： 10.1088/1742-6596/1350/1/012067

Web of Science

Measurement of the decays Lambda c -> Sigma pi pi at Belle

Berger M, Schwanda C, Suzuki K, Adachi I, Ahn J. K, Aihara H, Al Said S, Asner D. M, Atmacan H, Aulchenlco V, Aushev T, Ayad R, Babu V, Badhrees I, Bakich A. M, Bansa V, Behera R, Bhardw V, Bhuyan B, Biswal J, Bonvicini G, Bozek A, Brako M, Browder T. E, Ervenkov D. T, Chen A, Cheon B. G, Chilikin K, Cho K, Choi Y, Cinabro D, Czank T, Dash N, Di Carlo S, Dolezal Z, Dutta D, Eidelman S, Epifanov D, Fast J. E, Ferber T, Fulsom B. G, Garg R, Gaur V, Gabyshev N

PHYSICAL REVIEW D Vol. 98 ( 11 ) 2018.12

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

We report measurements of the branching fractions of the decays Lambda(+)(c) -> Sigma(+)pi(-)pi(+), Lambda(+)(c) -> Sigma(0)pi(+)pi(0) and Lambda(+)(c) -> Sigma(+)pi(0)pi(0) relative to the reference channel Lambda(+)(c) -> pK(-)p(+). The analysis is based on the full data sample collected at and near the gamma(4S) resonance by the Belle detector at the KEKB asymmetric-energy ethorne-collider, corresponding to an integrated luminosity of 711 fb(-1). We measure B(Lambda(+)(c) -> Sigma(+)pi(-)pi(+))/B(Lambda(+)(c) -> pK(-)pi(+)) = 0.719 +/- 0.003 +/- 0.024, B(Lambda(+)(c) -> Sigma(0) pi(+)pi(0))/B(Lambda(+)(c) -> pK(-)pi(+)) = 0.575 +/- 0.005 +/- 0.036 and B(Lambda(+)(c) -> Sigma(+)pi(0)pi(0))/B(Lambda(+)(c) -> pK(-)pi(+)) = 0.247 +/- 0.006 +/- 0.019. The listed uncertainties are statistical and systematic, respectively.

DOI： 10.1103/PhysRevD.98.112006

Web of Science

Observation of gamma(2S) -> gamma eta(b)(1S) Decay

Fulsom B. G, Pedlar T. K, Adachi I, Aihara H, Al Said S, Asner D. M, Atmacan H, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bakich A. M, Bansal V, Behera P, Beleno C, Berger M, Bhardwaj V, Bhuyan B, Bilka T, Biswal J, Bondar A, Bonvicini G, Bozek A, Bracko M, Browder T. E, Cao L, Cervenkov D, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S-K, Choi Y, Choudhury S, Cinabro D, Cunliffe S, Dash N, Di Carlo S, Dingfelder J, Dolezal Z, Dong T

PHYSICAL REVIEW LETTERS Vol. 121 ( 23 ) 2018.12

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

We report the observation of gamma(2S) -> gamma eta(b)(1S) based on an analysis of the inclusive photon spectrum of 24.7 fb(-1) of e(+)e(-) collisions at the gamma(2s) center-of-mass energy collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We measure a branching fraction of B [gamma(2S) -> gamma eta(b)(1S)] = (6.1(-0.7-0.6)(+0.6+0.9) x 10(-4) and derive an eta(b) (1S) mass of 9394.8(-3.1-2.7)(+2.7+4.5) MeV/c(2), where the uncertainties are statistical and systematic, respectively. The significance of our measurement is greater than 7 standard deviations, constituting the first observation of this decay mode.

DOI： 10.1103/PhysRevLett.121.232001

Web of Science

Observation of e(+) e(-) -> gamma chi(c1) and search for e(+) e(-) -> gamma chi(c0), gamma chi(c2), and gamma eta(c) at root s near 10.6 GeV at Belle

Jia S, Wang X. L, Shen C. P, Yuan C. Z, Adachi I, Aihara H, Al Said S, Asner D. M, Atmacan H, Aulchenko V, Aushev T, Ayad R, Babu V, Bansal V, Behera P, Beleno C, Berger M, Bhuyan B, Bilka T, Biswal J, Bobrov A, Bozek A, Bracko M, Browder T. E, Cao L, Cervenkov D, Chang P, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S. -K, Choi Y, Choudhury S, Cinabro D, Cunliffe S, Dash N, Di Carlo S, Dolezal Z, Dong T. V, Eidelman S, Epifanov D, Fast J. E

PHYSICAL REVIEW D Vol. 98 ( 9 ) 2018.11

Observation of e(+) e(-) -> pi(+) pi(-) pi(0)chi(b1,2) (1P) and search for e(+) e (-) -> phi chi(b1,2) (1P) at root s=10.96-11.05 GeV

Yin J. H, Yuan C. Z, Adachi I, Aihara H, Al Said S, Asner D. M, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bahinipati S, Bakich A. M, Bansal V, Behera P, Beleno C, Bhuyan B, Bilka T, Biswal J, Bobrov A, Bozek A, Bracko M, Browder T. E, Cao L, Cervenkov D, Chang P, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S. -K, Choi Y, Choudhury S, Cinabro D, Cunliffe S, Dash N, Di Carlo S, Dingfelder J, Dolezal Z, Dong T. V, Drasal Z, Eidelman S

PHYSICAL REVIEW D Vol. 98 ( 9 ) 2018.11

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

We report searches for the processes e(+) e(-) -> pi(+)pi(-)pi(0)chi(bJ) and e(+) e(-) -> phi chi(bJ) ( J = 1, 2) based on data samples collected by the Belle experiment at the KEKB collider. We report the first observation of the process e(+) e(-) -> (pi(+)pi(-)pi(0))non-omega(b1) and first evidence for e(+) e(-) -> omega chi(bJ) in the vicinity of the gamma(11020) resonance, with center- of- mass energies from 10.96 to 11.05 GeV. The significances for (pi(+)pi(-)pi(0))non-omega chi(b1) and omega chi(bJ) are greater than 5.3 sigma and 4.0 sigma, respectively. We also investigate the energy dependence of the e(+)e(-) -> (pi(+)pi(-)pi(0)) chi(bJ) cross section, but we cannot determine whether the contributions are from the gamma(10860) and gamma(11020) resonances or nonresonant continuum processes. The signals for e(+) e(-) ->phi chi(bj) are not significant, and the upper limits of the Born cross sections at the 90% confidence level are 0.7 and 1.0 pb for e(+)e(-) -> phi chi(bJ) and phi chi b(2), respectively, for center- of- mass energies from 10.96 to 11.05 GeV.

DOI： 10.1103/PhysRevD.98.091102

Web of Science

Evidence of a structure in (K)over-bar(0)Lambda(+)(c) consistent with a charged Xi(c)(2930)(+), and updated measurement of (B)over-bar(0) -> (K)over-bar(0)Lambda(+)(c) (Lambda)over-bar(c)(-) at Belle

Li Y. B, Shen C. P, Adachi I, Aihara H, Al Said S, Asner D. M, Aushev T, Ayad R, Babu V, Badhrees I, Bahinipati S, Ban Y, Bansal V, Behera P, Beleno C, Bhardwaj V, Bhuyan B, Biswal J, Bobrov A, Bozek A, Bracko M, Browder T. E, Cao L, Cervenkov D, Chang P, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S. -K, Choi Y, Choudhury S, Cinabro D, Cunliffe S, Dash N, Di Carlo S, Dingfelder J, Dolezal Z, Dong T. V, Drasal Z, Eidelman S, Epifanov D., Fas

EUROPEAN PHYSICAL JOURNAL C Vol. 78 ( 11 ) 2018.11

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

We report evidence for the charged charmed-strange baryon Xi(c)(2930)(+) with a signal significance of 3.9 sigma with systematic errors included. The charged Xi(c)(2930)(+) is found in its decay to K-S(0)Lambda(+)(c) in the substructure of (B) over bar (0) -> K-S(0)Lambda(+)(c)(Lambda) over bar (-)(c) decays. The measured mass and width are [2942.3 +/- 4.4(stat.) +/- 1.5(syst.)] MeV/c(2) and [14.8 +/- 8.8(stat.) +/- 2.5(syst.)] MeV, respectively, and the product branching fraction is B((B) over bar (0) -> Xi(c)(2930)(+)(Lambda) over bar (-)(c)) B(Xi(c)(2930)(+) -> (K) over bar (0)(S)Lambda(+)(c)) = [2.37 +/- 0.51(stat.) +/- 0.31 (syst.)] x 10(-4). We also measure B((B) over bar (0) -> (K) over bar (0)(S)Lambda(+)(c)(Lambda) over bar (-)(c)) = [3.99 +/- 0.76(stat.) +/- 0.51(syst.)] x 10(-4) with greater precision than previous experiments, and present the results of a search for the charmonium-like state Y (4660) and its spin partner, Y-eta, in the Lambda(+)(c)(Lambda) over bar (-)(c) invariant mass spectrum. No clear signals of the Y (4660) or Y-eta are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. Thesemeasurements are obtained from a sample of (772 +/- 11) x 10(6) B (B) over bar pairs collected at the Upsilon(4S) resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider.

DOI： 10.1140/epjc/s10052-018-6425-5

Web of Science

Search for the lepton-flavor-violating decay B-0 -> K-*0 mu(+/-)e(-/+)

Sandilya S, Trabelsi K, Schwartz A. J, Adachi I, Aihara H, Al Said S, Asner D. M, Atmacan H, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bahinipati S, Bakich A. M, Bansal V, Behera P, Beleno C, Bhardwaj V, Bhuyan B, Bilka T, Biswal J, Bobrov A, Bozek A, Bracko M, Browder T. E, Cao L, Cervenkov D, Chang P, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S. -K, Choi Y, Choudhury S, Cinabro D, Cunliffe S, Dash N, Di Carlo S, Dingfelder J., Do

PHYSICAL REVIEW D Vol. 98 ( 7 ) 2018.10

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

We have searched for the lepton-flavor-violating decay B-0 -> K-*0 mu(+/-)e(-/+) using a data sample of 711 fb(-1) that contains 772 x 10(6) B (B) over bar pairs. The data were collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+) e(-) collider. No signals were observed, and we set 90% confidence level upper limits on the branching fractions of B(B-0 -> K-*0 mu(+)e(-)) < 1.2 x 10(-7), B(B-0 -> K-*0 mu(-)e(+)) < 1.6 x 10(-7), and, for both decays combined, B(B-0 -> K-*0 mu(+/-)e(-/+)) < 1.8 x 10(-7). These are the most stringent limits on these decays to date.

DOI： 10.1103/PhysRevD.98.071101

Web of Science

Search for B- -> mu(-)(nu)over-bar(mu) Decays at the Belle Experiment

Sibidanov A, Varvell K. E, Adachi I, Aihara H, Al Said S, Asner D. M, Aushev T, Ayad R, Babu V, Badhrees I, Bahinipati S, Bakich A. M, Bansal V, Barberio E, Behera P, Bhuyan B, Biswal J, Bozek A, Bracko M, Browder T. E, Cervenkov D, 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, Drasal Z, Dutta D, Eidelman S, Epifanov D, Fast J. E, Ferber T, Fulsom B. G, Gaur V, Gabyshev

PHYSICAL REVIEW LETTERS Vol. 121 ( 3 ) 2018.7

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

We report the results of a search for the rare, purely leptonic decay B- -> mu(-)(nu) over bar (mu) performed with a 711 fb(-1) data sample that contains 772 x 10(6) B (B) over bar pairs, collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The signal events are selected based on the presence of a high momentum muon and the topology of the rest of the event showing properties of a generic B-meson decay, as well as the missing energy and momentum being consistent with the hypothesis of a neutrino from the signal decay. We find a 2.4 standard deviation excess above background including systematic uncertainties, which corresponds to a branching fraction of B(B- -> mu(-)(nu) over bar (mu)) = (6.46 +/- 2.22 +/- 1.60) x 10(-7) or a frequentist 90% confidence level interval on the B- -> mu(-)(nu) over bar (mu) branching fraction of [2.9, 10.7] x 10(-7).

DOI： 10.1103/PhysRevLett.121.031801

Web of Science

Search for gamma (1S,2S) -> Z(c)(+)Z(c)((')-) and e(+)e(-) -> Z(c)(+)Z(c)((')-) at root s=10.52, 10.58, and 10.867 Gev

Jia S, Shen C. P, Yuan C. Z, Adachi I, Aihara H, Al Said S, Asner D. M, Aulchenko V, Aushev T, Ayad R, Baba V, Badhrees I, Bansa V, Behera P, Beleno C, Bhuyan B, Bilka T, Biswa J, Bozek A, Bracko M, Cervenkov D, Chekelian V, Chen A, Cheon B. G, Chilikin K, Cho K, Choi S-K, Choi Y, Choudhuroy S, Cinabro D, Cunliffe S, Dash N, Di Carlo S, Dolezal Z, Eidelman S, Fast J. E, Ferber T, Fulsom B. G, Garg R, Gaur V, Gabyshev N, Garmash A, Gelb M, Giri A, Golde

PHYSICAL REVIEW D Vol. 97 ( 11 ) 2018.6

Physics potentials with the second Hyper-Kamiokande detector in Korea

Abe K, Abe Ke, Ahn S. H, Aihara H, Aimi A, Akutsu R, Andreopoulos C, Anghel I, Anthony L. H. V, Antonova M, Ashida Y, Aushev V, Barbi M, Barker G. J, Barr G, Beltrame P, Berardi V, Bergevin M, Berkman S, Berns L, Berry T, Bhadra S, Blaszczyk F. D. M, Blondel A, Bolognesi S, Boyd S. B, Bravar A, Bronner C, Avanzini M. Buizza, Cafagna F. S, Calland R, Cao S, Cartwright S. L, Catanesi M. G, Checchia C, Chen-Wishart Z, Cheon B. G, Cheoun M. K, Cho K, Choi J. H

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS Vol. 2018 ( 6 ) 2018.6

Language：English Publishing type：Research paper (scientific journal) Publisher：OXFORD UNIV PRESS INC

Hyper-Kamiokande consists of two identical water-Cherenkov detectors of total 520 kt, with the first one in Japan at 295 km from the J-PARC neutrino beam with 2.5 degrees off-axis angles (OAAs), and the second one possibly in Korea at a later stage. Having the second detector in Korea would benefit almost all areas of neutrino oscillation physics, mainly due to longer baselines. There are several candidate sites in Korea with baselines of 1000-1300 km and OAAs of 1 degrees-3 degrees.We conducted sensitivity studies on neutrino oscillation physics for a second detector, either in Japan (JD x 2) or Korea (JD + KD), and compared the results with a single detector in Japan. Leptonic charge-parity (CP) symmetry violation sensitivity is improved, especially when the CP is non-maximally violated. The larger matter effect at Korean candidate sites significantly enhances sensitivities to non-standard interactions of neutrinos and mass ordering determination. Current studies indicate the best sensitivity is obtained at Mt. Bisul (1088 km baseline, 1.3 degrees OAA). Thanks to a larger (1000 m) overburden than the first detector site, clear improvements to sensitivities for solar and supernova relic neutrino searches are expected.

DOI： 10.1093/ptep/pty044

Web of Science

Measurement of time-dependent CP asymmetries in B-0 -> K-S(0)eta gamma decays

Nakano H, Ishikawa A, Sumisawa K, Yamamoto H, Adachi I, Aihara H, Al Said S, Asner D. M, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bansal V, Behera P, Beleno C, Bhuyan B, Bilka T, Biswal J, Bozek A, Bracko M, Cervenkov D, Chekelian V, Cheon B. G, Chilikin K, Cho K, Choi S-K, Choi Y, Choudhury S, Cinabro D, Cunliffe S, Dash N, Di Carlo S, Dolezal Z, Eidelman S, Fast J. E, Ferber T, Fulsom B. G, Garg R, Gaur V, Gabyshev N, Garmash A, Gelb M, Giri A., Gol

PHYSICAL REVIEW D Vol. 97 ( 9 ) 2018.5

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

We report a measurement of time-dependent CP violation parameters in B-0 -> K-S(0)eta gamma decays. The study is based on a data sample, containing 772 x 10(6)B(B)over-bar pairs, that was collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We obtain the CP violation parameters of S = -1.32 +/- 0.77(stat) +/- 0.36(syst) and A = -0.48 +/- 0.41(stat) f 0.07(syst) for the invariant mass of the K-S(0)eta system up to 2.1 GeV/c(2).

DOI： 10.1103/PhysRevD.97.092003

Web of Science

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