The Performance evaluation of lead glass calorimeter for the J-PARC E16 experiment, 2

Ashikaga, Sakiko; Naruki, Megumi*; Hasegawa, Shoichi   

The spontaneous chiral symmetry breaking in QCD vacuum is thought to be an origin of hadron mass. The chiral symmetry is considered to be restored in hot/dense matter. The J-PARC E16 experiment aim to study the mechanism by measuring the mass spectrum of meson in nuclear medium. In our experiment, mesons are produced on nuclear target with the high momentum proton beam at the high-p beam line, which is under construction at the J-PARC Hadron Facility. We will measure electron pairs from the meson decay by using the E16 spectrometer. Lead glass calorimeter is a key device for identification of the electron pairs. We did a test experiment with hadron beam in spring 2017. In this presentation, the result of the test experiment and the performance evaluation of lead glass calorimeter will be explained.