Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
复制标题
利用大型强子对撞机运行 1 数据，用 ATLAS 探测器进行电子和光子能量校准
DOI：
10.1140/epjc/s10052-014-3071-4
复制
发表时间：
2014-10-01
影响因子：
4.4
通讯作者：
Zwalinski, L.
中科院分区：
文献类型：
--
作者：
Aad, G.;Abbott, B.;Zwalinski, L.
本文给出了用ATLAS探测器在根S=7和8TeV质心能量下获得的约25fb(-1)的大型强子对撞机质子-质子碰撞数据进行的电子和光子能量定标。电子和光子能量的重建是使用多变量算法进行优化的。热量计层的响应在数据和模拟中是均衡的，电磁簇射的纵向轮廓被用来估计量热计前面的被动物质，并重新优化探测器模拟。在所有校正后，使用Z谐振来设置绝对能量标度。对于来自Z衰变的电子，在探测器接受的大部分时间内，所实现的校准通常精确到0.05%，在含有大量无源材料的区域上升到0.2%。对于横向能量为10GeV的电子，剩余不确定度小于0.2-1%，对于光子，剩余不确定度平均为0.3%。对于60GeV以下的电子和光子，探测器分辨率的相对误差小于10%；对于500GeV以上的横向能量，探测器分辨率的相对误差上升到40%。
This paper presents the electron and photon energy calibration achieved with the ATLAS detector using about 25 fb(-1) of LHC proton-proton collision data taken at centre-of-mass energies of root s = 7 and 8 TeV. The reconstruction of electron and photon energies is optimised using multivariate algorithms. The response of the calorimeter layers is equalised in data and simulation, and the longitudinal profile of the electromagnetic showers is exploited to estimate the passive material in front of the calorimeter and reoptimise the detector simulation. After all corrections, the Z resonance is used to set the absolute energy scale. For electrons from Z decays, the achieved calibration is typically accurate to 0.05% in most of the detector acceptance, rising to 0.2% in regions with large amounts of passive material. The remaining inaccuracy is less than 0.2-1% for electrons with a transverse energy of 10 GeV, and is on average 0.3% for photons. The detector resolution is determined with a relative inaccuracy of less than 10% for electrons and photons up to 60 GeV transverse energy, rising to 40% for transverse energies above 500 GeV.