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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：59.14(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

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：7.79(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

$$beta$$ decay of $$^{133}$$In; $$gamma$$ emission from neutron-unbound states in $$^{133}$$Sn

Piersa, M.*; Korgul, A.*; Benito, J.*; Andreyev, A. N.; 他75名*

Physical Review C, 99(2), p.024304_1 - 024304_10, 2019/02

https://doi.org/10.1103/PhysRevC.99.024304
 被引用回数：11 パーセンタイル：74.44(Physics, Nuclear)

Excited states in $$^{133}$$Sn were investigated through the $$beta$$ decay of $$^{133}$$In at the ISOLDE facility. The ISOLDE Resonance Ionization Laser Ion Source (RILIS) provided isomer-selective ionization for $$^{133}$$In, allowing us to study separately, and in detail, the $$beta$$-decay branch of $$^{133}$$In $$J^{pi}$$ = (9/2$$^{+}$$) ground state and its $$J^{pi}$$ = (1/2$$^{-}$$) isomer. Thanks to the large spin difference of the two $$beta$$-decaying states of $$^{133}$$In, it is possible to investigate separately the lower and higher spin states in the daughter, $$^{133}$$Sn, and thus to probe independently different single-particle and single-hole levels. We report here new $$gamma$$ transitions observed in the decay of $$^{133}$$In, including those assigned to the deexcitation of the neutron-unbound states.

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：60.85(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：65.68(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

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：85.73(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.

論文

Measurement of the strong interaction induced shift and width of the 1s state of kaonic deuterium at J-PARC

Zmeskal, J.*; 谷田 聖; 他75名*

Acta Physica Polonica B, 46(1), p.101 - 112, 2015/01

https://doi.org/10.5506/APhysPolB.46.101
 被引用回数：10 パーセンタイル：58.48(Physics, Multidisciplinary)

The antikaon-nucleon ($$KN$$) interaction close to threshold provides crucial information on the interplay between spontaneous and explicit chiral symmetry breaking in low-energy QCD. In this context, the importance of kaonic deuterium X-ray spectroscopy has been well recognized, but no experimental results have yet been obtained due to the difficulty of the measurement. We propose to measure the shift and width of the kaonic deuterium $$1s$$ state with an accuracy of 60 eV and 140 eV, respectively, at J-PARC. These results, together with the kaonic hydrogen data (KpX at KEK, DEAR and SIDDHARTA at DA$$phi$$NE), will then permit the determination of values of both the isospin $$I = 0$$ and $$I = 1$$ antikaon-nucleon scattering lengths and will provide the most stringent constraints on the antikaon-nucleon interaction, promising a breakthrough. Refined Monte Carlo studies were performed, including the investigation of background suppression factors for the described setup. These studies have demonstrated the feasibility of determining the shift and width of the kaonic deuterium atom $$1s$$ state with the desired accuracy of 60 eV and 140 eV.

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