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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

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.

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