Studies of meson mass modification in cold nuclear matter in p+A collisions at J-PARC

佐甲 博之   ; 市川 真也; 成木 恵; 坂口 貴男; 佐藤 進  ; 他12名*

Sako, Hiroyuki; Ichikawa, Masaya; Naruki, Megumi; Sakaguchi, Takao; Sato, Susumu; 12 of others*

J-PARC E88 experiment is proposed to study meson mass modification in nuclei in 30 GeV p+A collisions with extremely high statistics. In KEK-E325 experiment, reduction of phi mass inside Cu nucleus at the lowest was observed. In this experiment, we will collect M decay events, in p+C, p+Cu, and p+Pb collisions. With the high-statistics events, we will study the momentum dependence of mass shift with high accuracy. We aim to evaluate condensate in a nucleon with the zero-momentum extrapolation of the mass shift. Furthermore, we will study the dispersion relations for longitudinally and transversely polarized separately, which are predicted to differ in the QCD sum rules. In this presentation, we will show the experimental feasibility, the detector R&D status, and the prospect.