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arXiv 1206.4071physics.ins-dethep-ex
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CMS μ子重构在sqrt(s)= 7时pp碰撞事件中的性能TeV

Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV

CMS Collaboration

摘要:

使用2010年LHC在sqrt(s)= 7 TeV的pp碰撞中收集的40个逆皮电子的数据,研究了CMS中μ子重建、识别和触发的性能。一些基准集的选择标准,涵盖了广泛的物理分析的需要进行了审查。对于所有考虑的选择,在CMS μ子系统覆盖的整个赝快度区域内,重建和识别横动量pT大于几个GeV的μ子的效率超过95%,abs(eta)< 2.4,而将强子误认为μ子的概率远低于1%。在pT高于几个GeV的情况下,在整个eta范围内触发单个μ子的效率高于90%,并且通常基本上更好。整体动量尺度测量的精度为0.2%的μ子从Z衰变。的横向动量分辨率从1%到6%不等,取决于赝快μ子与pT低于100 GeV,使用宇宙射线,它被证明是优于10%的中心区域的pT = 1 TeV。观测到的所有量的分布很好地再现了蒙特卡罗模拟。

英文摘要:

The performance of muon reconstruction, identification, and triggering in CMS has been studied using 40 inverse picobarns of data collected in pp collisions at sqrt(s) = 7 TeV at the LHC in 2010. A few benchmark sets of selection criteria covering a wide range of physics analysis needs have been examined. For all considered selections, the efficiency to reconstruct and identify a muon with a transverse momentum pT larger than a few GeV is above 95% over the whole region of pseudorapidity covered by the CMS muon system, abs(eta) < 2.4, while the probability to misidentify a hadron as a muon is well below 1%. The efficiency to trigger on single muons with pT above a few GeV is higher than 90% over the full eta range, and typically substantially better. The overall momentum scale is measured to a precision of 0.2% with muons from Z decays. The transverse momentum resolution varies from 1% to 6% depending on pseudorapidity for muons with pT below 100 GeV and, using cosmic rays, it is shown to be better than 10% in the central region up to pT = 1 TeV. Observed distributions of all quantities are well reproduced by the Monte Carlo simulation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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