Development of Resistivity Plate Chamber for E50 Experiment in Japan

Natsuki Tomidaa¹, Futaba Hayashi², Ryusuke Uda², Wen-Chen Chang³, Ming-Lee Chu³, Chia-Yu Hsieh^3*

¹Department of Physics, Kyoto University, Kyoto, Japan
²Department of Physics, Osaka University, Toyonaka, Osaka, Japan
³Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan

* Presenter:Chia-Yu Hsieh, email:cyhsieh0531@gmail.com

E50 experiment is a future experiment at J-PARC in Japan. There are two physics goals. One is to investigate charmed baryons via missing-mass spectroscopy of π- p → XD* reaction. Particle identification of π/K/p from the decay of D* meson and charmed baryons is necessary. The time-of-flight (TOF) RPC is used for particle identification of π/K/p below 1.7 GeV/c. The requirement of TOF RPC requires an efficiency of more than 99 % and a time resolution of 100 ps. Another physics goal is to study nucleon structure via exclusive Drell-Yan process: π-p→μ+μ-p. A muon-identification system will be additionally installed in the downstream of the original E50 spectrometer. It consists of two heavy absorbers and a tracking RPC. The requirement of muon-wall tracking RPC are the time resolution less than 150 ps, position resolution better than 1.3 mm in x direction, and 8.1 mm in y direction. In this presentation, the development of the E50 RPCs and the current status will be discussed.

Keywords: Resistivity Plate Chamber