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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

 被引用回数:16 パーセンタイル:72.74(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

 被引用回数:7 パーセンタイル:54.9(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

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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