應用CERN SPS CMS (緊湊渺子線圈) 高顆粒度電磁量能器原型之研究

Abstract

本研究利用在 2016 年大強子對撞機測束的新型高空間、高時間解析度矽量能器模組所獲得之實驗數據作為基礎，提出一種辨識粒子的鑑別變數。藉由電子測束能量 20, 32, 70, 100, 150, 200, 250 吉電子伏特及介子測束能量 125 吉電子伏特之實驗數據測得該量能器模組之能量線性度與能量解析度，並以測束之橫向與縱向粒子射叢特徵比較，確認摩地卡羅模擬之有效性。 在測束落於量能器模組首層中心範圍2毫米乘2毫米的範圍、末層測量能量小於3百萬電子伏特及該鑑別變數取於粒子射叢最大位置之條件下雙點相關變數的有效性獲得證實。並進一步以蒙地卡羅模擬電子與似電子-介子在同能量下應用該變數後，得到粒子在高時空間粒度量能器模組內粒子射叢之相異特徵，顯示未來應用的可能性。

This study proposes a particle identification discriminator analysis which based on the new-architected detector module with high spatial and temporal resolution com- posed of silicon-pads which was tested in 2016 CERN H2 testbeam campaign. The linearity and energy resolution measurements of the detector is initially obtained using the testbeam data of electron energies of 20, 32, 70, 100, 150, 200, 250GeV, pion energy of 125GeV while the longitudinal and transverse shower profiles are verified from the data/MC comparison. The validity of the discriminator two-point-correlation variable is then verified under the requirements of the alignment of testbeam with the center of the first layer within 2mm × 2mm window and the profile of the variable is acquired at which the shower maximum of the event is developed. Eventually, the distinctive signatures of electron and pion shower shape are presented by comparing the MC profiles, showing the disparity behavior in HGCAL and suggesting its potential for further application.