Measurement of pion and proton response and longitudinal shower profiles up to 20 nuclear interaction lengths with the ATLAS Tile calorimeter
Measurement of pion and proton response and longitudinal shower profiles up to 20 nuclear interaction lengths with the ATLAS Tile calorimeter
复制标题
DOI：
10.1016/j.nima.2010.01.037
复制
发表时间：
2010-04-01
影响因子：
1.4
通讯作者：
Zenis, T.
中科院分区：
文献类型：
--
作者：
Adragna, P.;Alexa, C.;Zenis, T.
已经测量了在 ATLAS 铁闪烁体瓦强子量热计中由 CERN 的 SPS H8 测试光束线产生的 20-180 GeV 能量范围内的介子和质子的响应。测试光束配置允许测量介子和质子的纵向簇射发展，最多可达 20 个核相互作用长度。研究发现介子在热量计中的穿透深度比质子更深。然而，质子引起的簇射在撞击粒子方向的横向上更宽。包括测量的总能量响应、π介子与质子能量比和分辨率，所有观测结果都与π介子引起的簇射中较高的电磁能量分数一致。使用多个强子物理列表将数据与 GEANT4 模拟进行比较。测量的纵向阵雨剖面通过分析阵雨参数化进行描述，精度为 5-10%。热量计后面泄漏的能量量被确定并参数化为光束能量和热量计深度的函数。这允许对标准投影几何中的测试光束结果进行泄漏校正。 (C) 2010 Elsevier B.V. 保留所有权利。
The response of pions and protons in the energy range of 20-180 GeV, produced at CERN's SPS H8 test-beam line in the ATLAS iron-scintillator Tile hadron calorimeter, has been measured. The test-beam configuration allowed the measurement of the longitudinal shower development for pions and protons up to 20 nuclear interaction lengths. It was found that pions penetrate deeper in the calorimeter than protons. However, protons induce showers that are wider laterally to the direction of the impinging particle. Including the measured total energy response, the pion-to-proton energy ratio and the resolution, all observations are consistent with a higher electromagnetic energy fraction in pion-induced showers. The data are compared with GEANT4 simulations using several hadronic physics lists. The measured longitudinal shower profiles are described by an analytical shower parametrization within an accuracy of 5-10%. The amount of energy leaking out behind the calorimeter is determined and parametrized as a function of the beam energy and the calorimeter depth. This allows for a leakage correction of test-beam results in the standard projective geometry. (C) 2010 Elsevier B.V. All rights reserved.