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論文

Evidence for the singly Cabibbo-suppressed decay $$Omega^0_ctoXi^-pi^+$$ and search for $$Omega^0_ctoXi^-K^+$$ and $$Omega^-K^+$$ decays at Belle

Han, X.*; 谷田 聖; Belle Collaboration*; 他170名*

Journal of High Energy Physics (Internet), 2023(1), p.55_1 - 55_12, 2023/01

https://doi.org/10.1007/JHEP01(2023)055
 被引用回数：6 パーセンタイル：57.15(Physics, Particles & Fields)

Using a data sample of 980 fb$$^{-1}$$ collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider, we study for the first time the singly Cabibbo-suppressed decays $$Omega^0_ctoXi^{-}pi^{+}$$ and $$Omega^-K^+$$ and the doubly Cabibbo-suppressed decay $$Omega^0_cto Xi^- K^{+}$$. Evidence for an $$Omega^0_c$$ signal in the $$Omega^0_ctoXi^-pi^+$$ mode is reported with a significance of $$4.5sigma$$ including systematic uncertainties. The ratio of branching fractions to the normalization mode $$Omega_c^0to Omega^-pi^+$$ is measured to be $${cal B}(Omega_{c}^{0} to Xi^{-} pi ^{+} )/{cal B}(Omega_c^0to Omega^-pi^+)=0.253pm 0.053({rm stat.})pm 0.030({rm syst.}).$$ No significant signals of $$Omega^0_ctoXi^-K^+$$ and $$Omega^-K^+$$ modes are found. The upper limits at $$90%$$ confidence level on ratios of branching fractions are determined to be $${cal B}(Omega_{c}^{0} to Xi^{-} K ^{+})/{cal B}(Omega_c^0to Omega^-pi^+) < 0.070$$ and $${cal B}(Omega_{c}^{0} to Omega^{-}K^{+})/{cal B}(Omega_c^0to Omega^-pi^+) < 0.29.$$

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：23 パーセンタイル：68.66(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

Observation of $$B^0 to p bar{Lambda}D^{(*)-}$$

Chang, Y.-Y.*; 谷田 聖; Belle Collaboration*; 他170名*

Physical Review Letters, 115(22), p.221803_1 - 221803_8, 2015/11

AA2015-0718.pdf:0.69MB

https://doi.org/10.1103/PhysRevLett.115.221803
 被引用回数：11 パーセンタイル：58.55(Physics, Multidisciplinary)

We report the first observation of the decays $$B^0 to p bar{Lambda}D^{(*)-}$$. The data sample of 711 fb$$^{-1}$$ used in this analysis corresponds to $$772 times 10^6$$ $$Bbar{B}$$ pairs, collected at the $$Upsilon(4S)$$ resonance by the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider. We observe $$19.8sigma$$ and $$10.8sigma$$ excesses of events for the two decay modes and measure the branching fractions of $$B^0 to p bar{Lambda}D^{-}$$ and $$B^0 to p bar{Lambda}D^{*-}$$ to be $$(25.1 pm 2.6 pm 3.5) times 10^{-6}$$ and $$(33.6 pm 6.3 pm 4.4) times 10^{-6}$$, respectively, where the first uncertainties are statistical and the second are systematic. These results are not compatible with the predictions based on the generalized factorization approach. In addition, a threshold enhancement in the dibaryon ($$pbar{Lambda}$$) system is observed, consistent with that observed in similar $$B$$ decays.

論文

Spectroscopic study of hyperon resonances below $$bar{K}N$$ threshold via the $$(K^-,n)$$ reaction on deuteron

山我 拓巳*; 谷田 聖; J-PARC E31 Collaboration*; 他70名*

JPS Conference Proceedings (Internet), 8, p.021016_1 - 021016_5, 2015/09

https://doi.org/10.7566/JPSCP.8.021016

We are planning to carry out an experimental study of hyperon resonance via the $$d(K^-,n)$$ reaction using kaon beam which has momentum of 1 GeV/$$c$$ at the J-PARC hadron experimental facility. In the presented reaction, $$Lambda(1405)$$ can be produced dynamically from meson-baryon resonant state. The performance of the counters was tested at the previous beam time of the J-PARC. The counters worked as expected. The preparation of experimental setup had been done.

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