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Vossen, A.*; 谷田 聖; Belle Collaboration*; 他164名*
Physical Review D, 98(1), p.012005_1 - 012005_9, 2018/07
被引用回数:5 パーセンタイル:28.36(Astronomy & Astrophysics)We report a measurement of the branching fraction of the decay . The analysis uses 772 pairs produced in data recorded by the Belle experiment at the KEKB asymmetric-energy collider. The tagging meson in the decay is fully reconstructed in a hadronic decay mode. On the signal side, we reconstruct the decay . The measured branching fractions are = [4.55 0.27 (stat.) 0.39 (syst.)], = [4.05 0.36 (stat.) 0.41 (syst.)], = [6.03 0.43 (stat.) 0.38 (syst.)], and = [6.46 0.53 (stat.) 0.52 (syst.)]. These are in good agreement with the current world average values.
高橋 智則*; 江川 弘行; 早川 修平; 細見 健二; 市川 裕大; 今井 憲一; 佐甲 博之; 佐藤 進; 杉村 仁志; 谷田 聖; et al.
JPS Conference Proceedings (Internet), 8, p.022011_1 - 022011_6, 2015/09
A search for the pentaquark in the reaction was performed at the J-PARC Hadron Facility. Two data samples were collected in 2010 and 2012 at beam momenta of 1.92 and 2.0 GeV/, respectively. No peak structure was observed in the missing mass spectra obtained from either data set. The upper limit for the production cross section averaged over the scattering-angle range of to in the laboratory frame was found to be 0.28 b/sr. The decay width of the can be directly connected to the production cross section through a theoretical calculation using an effective Lagrangian. The estimated upper limits of the width were 0.41 and 2.8 MeV for the spin-parities of and , respectively.
白鳥 昂太郎; 今井 憲一; 佐甲 博之; 佐藤 進; 他64名*
Physical Review Letters, 109(13), p.132002_1 - 132002_5, 2012/09
J-PARCにおいてペンタクォークの探索実験を1.4MeV/の高分解能のを用いて行った。1.92GeV/の中間子ビームを液体水素標的に照射し生成を試みた。しかしながら、ミッシングマススペクトルに明瞭なピーク構造を観測することはできなかった。質量領域1.51-1.55GeV/にて、微分生成断面積の上限値をの散乱角度2から15の範囲で求め0.26b/srを得た。この生成断面積の上限値からの幅の上限値をeffective Lagrangianによる理論計算を用いて求め、スピンパリティに応じ、0.72MeV/と3.1MeV/を得た。