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arXiv 1609.05331hep-ex
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在sqrt(s)= 8 TeV和比为2.76和7 TeV时pp碰撞中双微分包容射流截面的测量和QCD分析

Measurement and QCD analysis of double-differential inclusive jet cross-sections in pp collisions at sqrt(s) = 8 TeV and ratios to 2.76 and 7 TeV

CMS Collaboration

摘要:

本文给出了双微分包容射流截面随射流横向动量pT和绝对射流速度abs(y)变化的测量结果。用CMS探测器收集了sqrt(s)= 8 TeV的LHC质子-质子碰撞数据,对应的积分亮度为19.7毫微微电子能垒。喷流重建使用反kT聚类算法的大小参数为0.7,在相空间区域覆盖喷流pT从74 GeV到2.5 TeV和喷流绝对速度高达abs(y)= 3.0。21和74 GeV之间的低pT喷流范围也研究了abs(y)= 4.7,使用一个专用的数据样本对应的积分亮度为5.6个皮巴。测量的喷流截面的检测器的影响进行了校正,并与微扰QCD在次领先阶(NLO)使用不同的部分子分布函数(PDF)的预测。截面比进行相应的测量在2.76和7 TeV。由测量的双微分射流截面,用CT 10 NLO PDF计算Z质量处强耦合常数的值为α [S(M[Z])]= 0.1164 +0.0060-0.0043,其中误差包括PDF、尺度、非微扰效应和实验不确定性。提出了基于包容射流截面测量的改进PDF约束。

英文摘要:

A measurement of the double-differential inclusive jet cross section as a function of the jet transverse momentum pT and the absolute jet rapidity abs(y) is presented. Data from LHC proton-proton collisions at sqrt(s) = 8 TeV, corresponding to an integrated luminosity of 19.7 inverse femtobarns, have been collected with the CMS detector. Jets are reconstructed using the anti-kT clustering algorithm with a size parameter of 0.7 in a phase space region covering jet pT from 74 GeV up to 2.5 TeV and jet absolute rapidity up to abs(y) = 3.0. The low-pT jet range between 21 and 74 GeV is also studied up to abs(y) = 4.7, using a dedicated data sample corresponding to an integrated luminosity of 5.6 inverse picobarns. The measured jet cross section is corrected for detector effects and compared with the predictions from perturbative QCD at next-to-leading order (NLO) using various sets of parton distribution functions (PDF). Cross section ratios to the corresponding measurements performed at 2.76 and 7 TeV are presented. From the measured double-differential jet cross section, the value of the strong coupling constant evaluated at the Z mass is alpha[S(M[Z]) = 0.1164 +0.0060 -0.0043, where the errors include the PDF, scale, nonperturbative effects and experimental uncertainties, using the CT10 NLO PDFs. Improved constraints on PDFs based on the inclusive jet cross section measurement are presented.

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