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論文

Performance of RHICf detector during operation in 2017

Adriani, O.*; 谷田 聖; RHICf Collaboration*; 他17名*

Journal of Instrumentation (Internet), 16(10), p.P10027_1 - P10027_16, 2021/10

https://doi.org/10.1088/1748-0221/16/10/P10027
 被引用回数：0 パーセンタイル：0(Instruments & Instrumentation)

In the RHIC forward (RHICf) experiment, an operation with $$pp$$ collisions was performed at $$sqrt{s},=,$$510 GeV from 24-27 June 2017. The performances, energy and position resolutions, trigger efficiency, stability, and background during the operation, have been studied using data and simulations, which revealed that the requirements for production cross-section and transverse single-spin asymmetry measurements of very forward photons, $$pi^0$$s, and neutrons were satisfied. In this paper, we describe the details of these studies.

論文

Search for $$B_{s}^{0} rightarrow eta^{prime} X_{sbar{s}}$$ at Belle using a semi-inclusive method

Dubey, S.*; 谷田 聖; Belle Collaboration*; 他171名*

Physical Review D, 104(1), p.012007_1 - 012007_11, 2021/07

https://doi.org/10.1103/PhysRevD.104.012007
 被引用回数：1 パーセンタイル：10.04(Astronomy & Astrophysics)

We report the first search for the penguin-dominated process $$B_{s}^{0} rightarrow eta^{prime} X_{sbar{s}}$$ using a semi-inclusive method. A 121.4 $$mathrm{fb}^{-1}$$ integrated luminosity $$Upsilon(5S)$$ data set collected by the Belle experiment, at the KEKB asymmetric-energy $$e^+e^-$$ collider, is used. We observe no statistically significant signal and including all uncertainties, we set a 90% confidence level upper limit on the partial branching fraction at 1.4 $$times$$ 10$$^{-3}$$ for $$M(X_{sbar{s}})$$ $$leq$$ 2.4 GeV/$$c^{2}$$.

論文

Search for the dark photon in $$B^0 to A^{prime} A^{prime}$$, $$A^{prime} to e^+ e^-$$, $$mu^+ mu^-$$, and $$pi^+ pi^-$$ decays at Belle

Park, S.-H.*; 谷田 聖; Belle Collaboration*; 他217名*

Journal of High Energy Physics (Internet), 2021(4), p.191_1 - 191_15, 2021/04

https://doi.org/10.1007/JHEP04(2021)191
 被引用回数：0 パーセンタイル：0.01(Physics, Particles & Fields)

We present a search for the dark photon $$A^{prime}$$ in the $$B^0 to A^{prime} A^{prime}$$ decays, where $$A^{prime}$$ subsequently decays to $$e^+e^-$$, $$mu^+ mu^-$$, and $$pi^+ pi^-$$. The search is performed by analyzing $$772 times 10^6$$ $$Boverline{B}$$ events collected by the Belle detector at the KEKB $$e^+ e^-$$ energy-asymmetric collider at the $$Upsilon (4S)$$ resonance. No signal is found in the dark photon mass range $$0.01~mathrm{GeV}/c^2 le m_{A^{prime}} le 2.62~mathrm{GeV}/c^2$$, and we set upper limits of the branching fraction of $$B^0 to A^{prime} A^{prime}$$ at the 90% confidence level. The products of branching fractions, $$mathcal{B}(B^0 to A^{prime} A^{prime}) times mathcal{B}(A^{prime} to e^+ e^-)^2$$ and $$mathcal{B}(B^0 to A^{prime} A^{prime}) times mathcal{B}(A^{prime} to mu^+ mu^-)^2$$, have limits of the order of $$10^{-8}$$ depending on the $$A^{prime}$$ mass. Furthermore, considering $$A^{prime}$$ decay rate to each pair of charged particles, the upper limits of $$mathcal{B}(B^0 to A^{prime} A^{prime})$$ are of the order of $$10^{-8}$$-$$10^{-5}$$. From the upper limits of $$mathcal{B}(B^0 to A^{prime} A^{prime})$$, we obtain the Higgs portal coupling for each assumed dark photon and dark Higgs mass. The Higgs portal couplings are of the order of $$10^{-2}$$-$$10^{-1}$$ at $$m_{h'} simeq m_{B^0} pm 40~mathrm{MeV}/c^2$$ and $$10^{-1}$$-$$1$$ at $$m_{h'} simeq m_{B^0} pm 3~mathrm{GeV}/c^2$$.

論文

Test of lepton-flavor universality in $${Bto K^astell^+ell^-}$$ decays at Belle

Wehle, S.*; 谷田 聖; Belle Collaboration*; 他179名*

Physical Review Letters, 126(16), p.161801_1 - 161801_8, 2021/04

https://doi.org/10.1103/PhysRevLett.126.161801
 被引用回数：20 パーセンタイル：88.59(Physics, Multidisciplinary)

We present a measurement of $$R_{K^{ast}}$$, the branching fraction ratio $${{cal B}(Bto K^ast mu^+ mu^-)}$$/ $${{cal B}(Bto K^ast e^+ e^-)}$$, for both charged and neutral $$B$$ mesons. The ratio for the charged case, $$R_{K{^{ast +}}}$$, is the first measurement ever performed. In addition, we report absolute branching fractions for the individual modes in bins of the squared dilepton invariant mass, $$q^2$$. The analysis is based on a data sample of $$711~mathrm{fb}^{-1}$$, containing $$772times 10^{6}$$ $$Bbar B$$ events, recorded at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider. The obtained results are consistent with Standard Model expectations.

論文

Evidence for a vector charmoniumlike state in $$e^+e^- to D^+_sD^*_{s2}(2573)^-+c.c.$$

Jia, S.*; 谷田 聖; Belle Collaboration*; 他175名*

Physical Review D, 101(9), p.091101_1 - 091101_8, 2020/05

https://doi.org/10.1103/PhysRevD.101.091101
 被引用回数：11 パーセンタイル：61.3(Astronomy & Astrophysics)

We report the measurement of $$e^+e^- to D^+_sD^*_{s2}(2573)^-+c.c.$$ via initial-state radiation using a data sample of an integrated luminosity of 921.9 fb$$^{-1}$$ collected with the Belle detector at the $$Upsilon(4S)$$ and nearby. We find evidence for an enhancement with a 3.4$$sigma$$ significance in the invariant mass of $$D^+_sD^*_{s2}(2573)^- +c.c.$$ The measured mass and width are $$(4619.8^{+8.9}_{-8.0}({rm stat.})pm2.3({rm syst.}))~{rm MeV}/c^{2}$$ and $$(47.0^{+31.3}_{-14.8}({rm stat.})pm4.6({rm syst.}))~{rm MeV}$$, respectively. The mass, width, and quantum numbers of this enhancement are consistent with the charmonium-like state at 4626 MeV/$$c^2$$ recently reported by Belle in $$e^+e^-to D^+_sD_{s1}(2536)^-+c.c.$$ The product of the $$e^+e^-to D^+_sD^*_{s2}(2573)^-+c.c.$$ cross section and the branching fraction of $$D^*_{s2}(2573)^-to{bar D}^0K^-$$ is measured from $$D^+_sD^*_{s2}(2573)^-$$ threshold to 5.6 GeV.

論文

Study of $$B to p {bar p} pi pi$$

Chu, K.*; 谷田 聖; Belle Collaboration*; 他176名*

Physical Review D, 101(5), p.052012_1 - 052012_8, 2020/03

https://doi.org/10.1103/PhysRevD.101.052012
 被引用回数：2 パーセンタイル：15.55(Astronomy & Astrophysics)

Using a data sample of $$772 times 10^6$$ BB pairs collected on the $${Upsilon}(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider, we report the observations of $$B^0to p{bar p}pi^+pi^-$$ and $$B^+ to p{bar p}pi^+pi^0$$. We measure a decay branching fraction of $$(0.83 pm 0.17 pm 0.17) times 10^-6$$ in $$B^0to p{bar{p}}pi^+pi^-$$ for $$M_{pi^+pi^-} < 1.22 GeV/c^2$$ with a significance of 5.5 standard deviations. The contribution from $$B0 to p{bar p}K^0$$ is excluded. We measure a decay branching fraction of $$(4.58 pm 1.17 pm 0.67) times 10^-6$$ for $$B^+ to p{bar p}pi^+pi^0$$ with $$M_{pi^+pi^0} < 1.3 GeV/c^2$$ with a significance of 5.4 standard deviations. We study the difference of the $$M_{p{bar p}}$$ distributions in $$B^0to p{bar p}pi^+pi^-$$ and $$B^+ to p{bar p}pi^+pi^0$$.

論文

Measurements of the branching fractions $${cal B}(B^{-} to bar{Lambda}_{c}^{-} Xi_{c}^{'0})$$, $${cal B}(B^{-} to bar{Lambda}_{c}^{-} Xi_{c}(2645)^{0})$$ and $${cal B}(B^{-} to bar{Lambda}_{c}^{-} Xi_{c}(2790)^{0})$$

Li, Y.*; 谷田 聖; Belle Collaboration*; 他175名*

Physical Review D, 100(11), p.112010_1 - 112010_8, 2019/12

https://doi.org/10.1103/PhysRevD.100.112010
 被引用回数：1 パーセンタイル：7.66(Astronomy & Astrophysics)

Using the data sample of 711 fb$$^{-1}$$ of $$Upsilon(4S)$$ on-resonance data taken by the Belle detector at the KEKB asymmetric-energy electron-positron collider, we present the first measurements of branching fractions of the decays $$B^{-} to bar{Lambda}_{c}^{-} Xi_{c}^{'0}$$, $$B^{-} to bar{Lambda}_{c}^{-} Xi_{c}(2645)^{0}$$, and $$B^{-} to bar{Lambda}_{c}^{-} Xi_{c}(2790)^{0}$$. The signal yields for these decays are extracted from the recoil mass spectrum of the system recoiling against $$bar{Lambda}_{c}^{-}$$ baryons in selected $$B^-$$ candidates. The branching fraction of $$B^{-} to bar{Lambda}_{c}^{-} Xi_{c}(2790)^{0}$$ is measured to be $$(1.1 pm 0.4 pm 0.2)times 10^{-3}$$, where the first uncertainty is statistical and the second is systematic. The 90% credibility level upper limits on $${cal B}(B^{-} to bar{Lambda}_{c}^{-} Xi_{c}^{'0})$$ and $${cal B}(B^{-} to bar{Lambda}_{c}^{-} Xi_{c}(2645)^{0})$$ are determined to be $$6.5times 10^{-4}$$ and $$7.9times 10^{-4}$$, respectively.

論文

Observation of a vector charmoniumlike state in $$e^+e^- to D^+_sD_{s1}(2536)^-+c.c.$$

Jia, S.*; 谷田 聖; Belle Collaboration*; 他172名*

Physical Review D, 100(11), p.111103_1 - 111103_8, 2019/12

https://doi.org/10.1103/PhysRevD.100.111103
 被引用回数：25 パーセンタイル：79.99(Astronomy & Astrophysics)

Using a data sample of 921.9 fb$$^{-1}$$ collected with the Belle detector, we study the process of $$e^+e^-to D^+_sD_{s1}(2536)^-+c.c.$$ via initial-state radiation. We report the first observation of a vector charmoniumlike state decaying to $$D^+_sD_{s1}(2536)^-+c.c.$$ with a significance of 5.9$$sigma$$, including the systematic uncertainties. The measured mass and width are $$(4625.9^{+6.2}_{-6.0}({rm stat.})pm0.4({rm syst.}))~{rm MeV}/c^{2}$$ and $$(49.8^{+13.9}_{-11.5}({rm stat.})pm4.0({rm syst.}))~{rm MeV}$$, respectively. The product of the $$e^+e^-to D^+_sD_{s1}(2536)^-+c.c.$$ cross section and the branching fraction of $$D_{s1}(2536)^-to{bar D}^{*0}K^-$$ is measured from the $$D_s bar{D}_{s1}(2536)$$ threshold to 5.59 GeV.

論文

Evidence for $$B^+ rightarrow h_c K^+$$ and observation of $$eta_c(2S) to p bar{p} pi^+ pi^-$$

Chilikin, K.*; 谷田 聖; Belle Collaboration*; 他173名*

Physical Review D, 100(1), p.012001_1 - 012001_16, 2019/07

https://doi.org/10.1103/PhysRevD.100.012001
 被引用回数：5 パーセンタイル：30.59(Astronomy & Astrophysics)

A search for the decays $$B^+ rightarrow h_c K^+$$ and $$B^0 rightarrow h_c K_S^0$$ is performed. Evidence for the decay $$B^+ rightarrow h_c K^+$$ is found; its significance is $$4.8sigma$$. No evidence is found for $$B^0 rightarrow h_c K_S^0$$. The branching fraction for $$B^+ rightarrow h_c K^+$$ is measured to be $$(3.7^{+1.0}_{-0.9}{}^{+0.8}_{-0.8}) times 10^{-5}$$; the upper limit for the $$B^0 rightarrow h_c K_S^0$$ branching fraction is $$1.4 times 10^{-5}$$ at $$90%$$ C.L. In addition, a study of the $$p bar{p} pi^+ pi^-$$ invariant mass distribution in the channel $$B^+ to (p bar{p} pi^+ pi^-) K^+$$ results in the first observation of the decay $$eta_c(2S) to p bar{p} pi^+ pi^-$$ with $$12.1sigma$$ significance. The analysis is based on the 711 $$mathrm{fb}^{-1}$$ data sample collected by the Belle detector at the asymmetric-energy $$e^+ e^-$$ collider KEKB at the $$Upsilon(4S)$$ resonance.

論文

Evidence for the decay $$B^0to pbar{p}pi^0$$

Pal, B.*; 谷田 聖; Belle Collaboration*; 他173名*

Physical Review D, 99(9), p.091104_1 - 091104_8, 2019/05

AA2019-0571.pdf:0.38MB

https://doi.org/10.1103/PhysRevD.99.091104
 被引用回数：6 パーセンタイル：35.61(Astronomy & Astrophysics)

We report a search for the charmless baryonic decay $$B^0to pbar{p}pi^0$$ with a data sample corresponding to an integrated luminosity of 711~$$rm fb^{-1}$$ containing $$(772pm 10)times 10^6$$ $$B^0bar{B}^0$$ pairs. The data was collected by the Belle experiment running on the $$Upsilon(4S)$$ resonance at the KEKB $$e^+e^-$$ collider. We measure a branching fraction $$mathcal{B}(B^0to pbar{p}pi^0)= (5.0pm1.8pm0.6)times 10^{-7}$$, where the first uncertainty is statistical and the second is systematic. The signal has a significance of 3.1 standard deviations and constitutes the first evidence for this decay mode. We also search for the intermediate two-body decays $$B^{0}toDelta^+bar{p}$$ and $$B^0tobar{Delta}^-p$$, and set an upper limit on the branching fraction: $$mathcal{B}(B^0to Delta^+bar{p})+mathcal{B}(B^0tobar{Delta}^-p) < 1.6times10^{-6}$$ at 90% confidence level.

論文

Search for the $$B to Y(4260) K, Y(4260) to J/psi pi^+pi^-$$ decays

Garg, R.*; 谷田 聖; Belle Collaboration*; 他172名*

Physical Review D, 99(7), p.071102_1 - 071102_8, 2019/04

AA2019-0539.pdf:0.41MB

https://doi.org/10.1103/PhysRevD.99.071102
 被引用回数：3 パーセンタイル：19.81(Astronomy & Astrophysics)

We report the results of a search for the $$B to Y(4260) K, Y(4260)to J/psipi^+pi^-$$ decays. This study is based on a data sample corresponding to an integrated luminosity of 711 fb$$^{-1}$$, collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider. We investigate the $$J/psipi^+pi^-$$ invariant mass distribution in the range 4.0 to 4.6 GeV/$$c^2$$ using both $$B^+ to J/psi pi^+pi^- K^+$$ and $$B^0 to J/psi pi^+pi^- K^0_S$$ decays. We find excesses of events above the background levels, with a significances of 2.1 and 0.9 standard deviations for charged and neutral $$B to Y(4260) K$$ decays, respectively, taking into account the systematic uncertainties. These correspond to upper limits on the product of branching fractions, $${cal B}(B^+ to Y(4260) K^+) times {cal B}(Y(4260) to J/psi pi^+ pi^-) < 1.4 times 10^{-5}$$ and $${cal B}(B^0 to Y(4260) K^0) times {cal B}(Y(4260) to J/psi pi^+ pi^-) < 1.7 times 10^{-5}$$ at the 90% confidence level.

論文

Multiparticle azimuthal correlations for extracting event-by-event elliptic and triangular flow in Au+Au collisions at $$sqrt{s_{_{NN}}}$$ = 200 GeV

Adare, A.*; 長谷川 勝一; 今井 憲一; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他317名*

Physical Review C, 99(2), p.024903_1 - 024903_16, 2019/02

AA2019-0531.pdf:1.31MB

https://doi.org/10.1103/PhysRevC.99.024903
 被引用回数：12 パーセンタイル：73.85(Physics, Nuclear)

We present measurements of elliptic and triangular azimuthal anisotropy of charged particles detected at forward rapidity $$1 < |eta| < 3$$ in Au$$+$$Au collisions at $$sqrt{s_{_{NN}}}=200$$ GeV, as a function of centrality. The multiparticle cumulant technique is used to obtain the elliptic flow coefficients $$v_2{2}$$, $$v_2{4}$$, $$v_2{6}$$, and $$v_2{8}$$, and triangular flow coefficients $$v_3{2}$$ and $$v_3{4}$$. Using the small-variance limit, we estimate the mean and variance of the event-by-event $$v_2$$ distribution from $$v_2{2}$$ and $$v_2{4}$$. In a complementary analysis, we also use a folding procedure to study the distributions of $$v_2$$ and $$v_3$$ directly, extracting both the mean and variance. Implications for initial geometrical fluctuations and their translation into the final state momentum distributions are discussed.

論文

Measurements of isospin asymmetry and difference of direct $$CP$$ asymmetries in inclusive $$B to X_s gamma$$ decays

綿貫 峻*; 谷田 聖; Belle Collaboration*; 他175名*

Physical Review D, 99(3), p.032012_1 - 032012_13, 2019/02

AA2019-0536.pdf:0.41MB

https://doi.org/10.1103/PhysRevD.99.032012
 被引用回数：13 パーセンタイル：60.14(Astronomy & Astrophysics)

We report measurements of isospin asymmetry $$Delta_{0-}$$ and difference of direct $$CP$$ asymmetries $$Delta A_{CP}$$ between charged and neutral $$B to X_s gamma$$ decays. This analysis is based on the data sample containing $$772 times 10^6 Bbar{B}$$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric $$e^+ e^-$$ collider. Using a sum-of-exclusive technique with invariant $$X_s$$ mass up to 2.8 GeV/$$c^2$$, we obtain $$Delta_{0-} = bigl[-0.48 pm 1.49 {rm (stat.)} pm 0.97 {rm (syst.)} pm 1.15 {(f_{+-}/f_{00})}bigr]$$% and $$Delta A_{CP} = bigl[+3.69 pm 2.65 {rm (stat.)} pm 0.76{rm (syst.)}bigr]$$%, where the last uncertainty for $$Delta_{0-}$$ is due to the uncertainty on the production ratio of $$B^+B^-$$ to $$B^0bar{B}^0$$ in $$Upsilon(4S)$$ decays. The measured value of $$Delta_{0-}$$ is consistent with zero, allowing us to constrain the resolved photon contribution in the $$B to X_s gamma$$, 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 $$B to X_s gamma$$ decays. All the measurements are the most precise to date.

論文

Evidence of a structure in $$bar{K}^{0} Lambda _{c}^{+}$$ consistent with a charged $$Xi _c(2930)^{+}$$, and updated measurement of $$bar{B}^{0} rightarrow bar{K}^{0} Lambda _{c}^{+} bar{Lambda }_{c}^{-}$$ at Belle

Li, Y. B.*; 谷田 聖; Belle Collaboration*; 他175名*

European Physical Journal C, 78(11), p.928_1 - 928_8, 2018/11

https://doi.org/10.1140/epjc/s10052-018-6425-5
 被引用回数：17 パーセンタイル：65.21(Physics, Particles & Fields)

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 $$bar{B}^{0} to K^{0}_{S} Lambda_{c}^{+} bar{Lambda}_{c}^{-}$$ decays. The measured mass and width are $$[2942.3 pm 4.4 (rm stat.) pm 1.5(rm syst.)]$$~MeV/$$c^{2}$$ and $$[14.8 pm 8.8(rm stat.) pm 2.5(rm syst.)]$$~MeV, respectively, and the product branching fraction is $${cal B}(bar{B}^{0} to Xi_c(2930)^{+} bar{Lambda}_{c}^{-})$$ $${cal B}(Xi_c(2930)^{+}to bar{K}^{0} Lambda_{c}^{+})=[2.37 pm 0.51 (rm stat.)pm 0.31(rm syst.)]times 10^{-4}$$. We also measure $${cal B}(bar{B}^{0} to bar{K}^{0} Lambda_{c}^{+} bar{Lambda}_{c}^{-}) = [3.99 pm 0.76(rm stat.) pm 0.51(rm syst.)] times 10^{-4}$$ 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 $$Lambda_{c}^{+}bar{Lambda}_{c}^{-}$$ 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. These measurements are obtained from a sample of $$(772pm11)times 10^{6} Bbar{B}$$ pairs collected at the $$Upsilon(4S)$$ resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider.

論文

Measurement of $$eta_c(1S)$$, $$eta_c(2S)$$, and nonresonant $$eta' pi^+ pi^-$$ production via two-photon collisions

Xu, Q. N.*; 谷田 聖; Belle Collaboration*; 他176名*

Physical Review D, 98(7), p.072001_1 - 072001_17, 2018/10

AA2018-0654.pdf:0.86MB

https://doi.org/10.1103/PhysRevD.98.072001
 被引用回数：6 パーセンタイル：32.94(Astronomy & Astrophysics)

We report the measurement of $$gamma gamma to eta_c(1S)$$, $$eta_c(2S) to eta' pi^+ pi^-$$ with $$eta'$$ decays to $$gamma rho$$ and $$eta pi^+ pi^-$$ using 941 fb$$^{-1}$$ of data collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider. The $$eta_c(1S)$$ mass and width are measured to be $$M = [2984.6pm0.7 (stat.)pm2.2 (syst.)]$$ MeV/$$c^{2}$$ and $$Gamma = [30.8^{+2.3}_{-2.2}~(stat.) pm 2.5~(syst.)]$$ MeV, respectively. First observation of $$eta_c(2S) to eta' pi^+ pi^-$$ with a significance of $$5.5sigma$$ including systematic error is obtained, and the $$eta_c(2S)$$ mass is measured to be $$M = [3635.1pm3.7~(stat.)pm2.9~(syst.)]$$ MeV/$$c^{2}$$. The products of the two-photon decay width and branching fraction $$(B)$$ of decays to $$eta'pi^+ pi^-$$ are determined to be $$Gamma_{gamma gamma}B = [65.4pm2.6~(stat.)pm6.9~(syst.)]$$ eV for $$eta_c(1S)$$ and $$[5.6^{+1.2}_{-1.1}~(stat.)pm1.1~(syst.)]$$ eV for $$eta_c(2S)$$. A new decay mode for the $$eta_c(1S)$$ to $$eta'f_0(2080)$$ with $$f_0(2080) to pi^+ pi^-$$ is observed with a statistical significance of $$20sigma$$. The $$f_0(2080)$$ mass and width are determined to be $$M = [2083^{+63}_{-66}~(stat.)pm 32~(syst.)]$$ MeV/$$c^{2}$$ and $$Gamma = [178^{+60}_{-178}~(stat.) pm 55~(syst.)]$$ MeV. The cross sections for $$gamma gamma to eta' pi^+ pi^-$$ and $$eta'f_{2}(1270)$$ are measured for the first time.

論文

Inclusive study of bottomonium production in association with an $$eta $$ meson in $$e^+e^-$$ annihilations near $$Upsilon (5S)$$

Tamponi, U.*; 谷田 聖; Belle Collaboration*; 他174名*

European Physical Journal C, 78(8), p.633_1 - 633_10, 2018/08

https://doi.org/10.1140/epjc/s10052-018-6086-4
 被引用回数：14 パーセンタイル：58.56(Physics, Particles & Fields)

We study bottomonium production in association with an $$eta$$ meson in $$e^+e^-$$ annihilations near the $$Upsilon(5S)$$, at a center of mass energy of $$sqrt{s}=10.866,$$GeV. The results are based on the $$121.4,$$fb$$^{-1}$$ data sample collected by the Belle experiment at the asymmetric energy KEKB collider. Only the $$eta$$ meson is reconstructed and the missing-mass spectrum of $$eta$$ candidates is investigated. We observe the $$e^+e^-toetaUpsilon_J(1D)$$ process and find evidence for the $$e^+e^-toetaUpsilon(2S)$$ process, while no significant signals of $$Upsilon(1S)$$, $$h_b(1P)$$, nor $$h_b(2P)$$ are found. Cross sections for the studied processes are reported.

論文

Observation of $$Xi_{c}(2930)^0$$ and updated measurement of $$B^{-} to K^{-} Lambda_{c}^{+} bar{Lambda}_{c}^{-}$$ at Belle

Li, Y. B.*; 谷田 聖; Belle Collaboration*; 他178名*

European Physical Journal C, 78(3), p.252_1 - 252_8, 2018/03

https://doi.org/10.1140/epjc/s10052-018-5720-5
 被引用回数：32 パーセンタイル：83.05(Physics, Particles & Fields)

We report the first observation of the $$Xi_{c}(2930)^0$$ charmed-strange baryon with a significance greater than 5$$sigma$$. The $$Xi_{c}(2930)^0$$ is found in its decay to $$K^- Lambda_{c}^+$$ in $$B^{-} to K^{-} Lambda_{c}^{+} bar{Lambda}_{c}^{-}$$ decays. The measured mass and width are $$[2928.9 pm 3.0(rm stat.)^{+0.9}_{-12.0}(rm syst.)]$$ MeV/$$c^{2}$$ and $$[19.5 pm 8.4(rm stat.) ^{+5.9}_{-7.9}(rm syst.)]$$ MeV, respectively, and the product branching fraction is $${cal B}(B^{-} to Xi_{c}(2930)^0 bar{Lambda}_{c}^{-})$$$$ {cal B}(Xi_{c}(2930)^0 to K^- Lambda_{c}^{+})$$=$$[1.73 pm 0.45(rm stat.) pm 0.21(rm syst.)] times 10^{-4}$$. We also measure $${cal B}(B^{-} to K^{-} Lambda_{c}^{+} bar{Lambda}_{c}^{-}) = [4.80 pm 0.43(rm stat.) pm 0.60(rm syst.)] times 10^{-4}$$ with improved precision, and search for the charmonium-like state $$Y(4660)$$ and its spin partner, $$Y_{eta}$$, in the $$Lambda_{c}^{+}bar{Lambda}_{c}^{-}$$ invariant mass spectrum. No clear signals of the $$Y(4660)$$ nor its spin partner are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of $$(772pm11)times 10^{6} Bbar{B}$$ pairs collected at the $$Upsilon(4S)$$ resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider.

論文

Observation of excited $$Omega_c$$ charmed baryons in $$e^+e^-$$ collisions

Yelton, J.*; 谷田 聖; Belle Collaboration*; 他177名*

Physical Review D, 97(5), p.051102_1 - 051102_6, 2018/03

AA2018-0513.pdf:0.37MB

https://doi.org/10.1103/PhysRevD.97.051102
 被引用回数：65 パーセンタイル：94.99(Astronomy & Astrophysics)

Using the entire Belle data sample of 980 $${rm fb}^{-1}$$ of $$e^+e^-$$ collisions, we present the results of a study of excited $$Omega_c$$ charmed baryons in the decay mode $$Xi_c^+K^-$$. We show confirmation of four of the five narrow states reported by the LHCb Collaboration: the $$Omega_c(3000)$$, $$Omega_c(3050)$$, $$Omega_c(3066)$$, and $$Omega_c(3090)$$.

論文

Search for the $$0^{--}$$ Glueball in $$Upsilon(1S)$$ and $$Upsilon(2S)$$ decays

Jia, S.*; 谷田 聖; Belle Collaboration*; 他170名*

Physical Review D, 95(1), p.012001_1 - 012001_13, 2017/01

AA2016-0474.pdf:1.26MB

https://doi.org/10.1103/PhysRevD.95.012001
 被引用回数：21 パーセンタイル：68.39(Astronomy & Astrophysics)

We report the first search for the $$J^{PC}=0^{--}$$ glueball in $$Upsilon(1S)$$ and $$Upsilon(2S)$$ decays with data samples of $$(102pm2)$$ million and $$(158pm4)$$ million events, respectively, collected with the Belle detector. No significant signals are observed in any of the proposed production modes, and the 90% credibility level 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 a $$chi_{c1}$$ are measured to be $$B(Upsilon(1S) to chi_{c1} + {rm anything} = (1.90 pm 0.43 ({rm stat.}) pm 0.14 ({rm syst.})) times 10^{-4}$$ with an improved precision over prior measurements and $$B(Upsilon(2S) to chi_{c1} + {rm anything} = (2.24 pm 0.44 ({rm stat.}) pm 0.20 ({rm syst.})) times 10^{-4}$$ for the first time.

論文

Studies of charmed strange baryons in the $$Lambda D$$ final state at Belle

加藤 悠司*; 谷田 聖; Belle Collaboration*; 他175名*

Physical Review D, 94(3), p.032002_1 - 032002_10, 2016/08

AA2016-0393.pdf:0.32MB

https://doi.org/10.1103/PhysRevD.94.032002
 被引用回数：42 パーセンタイル：85.98(Astronomy & Astrophysics)

We report the discovery of $$Xi_c(3055)^0$$, observed by its decay into the final-state $$Lambda D^0$$, and present the first observation and evidence of the decays of $$Xi_c(3055)^+$$ and $$Xi_c(3080)^+$$ into $$Lambda D^+$$. We also perform a combined analysis of the $$Lambda D^+$$ with the $$Sigma_c^{++}K^-$$ and $$Sigma_c^{*++}K^-$$ decay modes to measure the ratios of branching fractions, masses and widths with improved accuracy. We measure the ratios of branching fractions $${cal B}(Xi_c(3055)^+ to Lambda D^+)/{cal B}(Xi_c(3055)^+ to Sigma_c^{++}K^- = 5.09 pm 1.01 pm 0.76$$, $${cal B}(Xi_c(3080)^+ to Lambda D^+)/{cal B}(Xi_c(3080)^+ to Sigma_c^{++}K^- = 1.29 pm 0.30 pm 0.15$$, and $${cal B}(Xi_c(3080)^+ to Sigma_c^{*++}K^-)/{cal B}(Xi_c(3080)^+ to Sigma_c^{++}K^- = 1.07 pm 0.27 pm 0.04$$, where the uncertainties are statistical and systematic. The analysis is performed using a 980 fb$$^{-1}$$ data sample collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider.

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