J-PARC E19 experiment; Pentaquark search in hadronic reaction at J-PARC

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

https://doi.org/10.7566/JPSCP.8.022011

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.