Determination of jet energy calibration and transverse momentum resolution in CMS
Determination of jet energy calibration and transverse momentum resolution in CMS
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DOI：
10.1088/1748-0221/6/11/p11002
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发表时间：
2011-11-01
影响因子：
1.3
通讯作者：
Weinberg, M.
中科院分区：
文献类型：
--
作者：
Chatrchyan, S.;Khachatryan, V.;Weinberg, M.
本文介绍了在质心能量为7TeV的质子-质子碰撞中收集的数据样本，在CMS中进行了射流能量校准和横向动量分辨率的测量，相应的积分光度为36p（-1）。利用dijet和gamma/Z+射流事件中的横向动量平衡测量了CMS探测器中的射流能量响应，以及横向动量分辨率。结果显示了三种不同的方法来重建喷流：一种基于量热计的方法，“jet - plus - track”方法，它通过利用相关的轨迹来改进量热计喷流的测量，以及“Particle Flow”方法，它试图在喷流聚类之前，基于所有相关子探测器的信息来单独重建事件中的每个粒子。
Measurements of the jet energy calibration and transverse momentum resolution in CMS are presented, performed with a data sample collected in proton-proton collisions at a centre-of-mass energy of 7TeV, corresponding to an integrated luminosity of 36p(-1). The transverse momentum balance in dijet and gamma/Z+jets events is used to measure the jet energy response in the CMS detector, as well as the transverse momentum resolution. The results are presented for three different methods to reconstruct jets: a calorimeter-based approach, the "Jet-Plus-Track" approach, which improves the measurement of calorimeter jets by exploiting the associated tracks, and the "Particle Flow" approach, which attempts to reconstruct individually each particle in the event, prior to the jet clustering, based on information from all relevant subdetectors.