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Measurement of jet multiplicity distributions in ... formula ... production in pp collisions at ... formula ...

机译:在...公式下pp碰撞中... ...生产中的射流多重性测量

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摘要

The normalised differential top quark-antiquark production cross section is measured as a function of the jet multiplicity in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC with the CMS detector. The measurement is performed in both the dilepton and lepton+jets decay channels using data corresponding to an integrated luminosity of 5.0 fb-1. Using a procedure to associate jets to decay products of the top quarks, the differential cross section of the tt¯ production is determined as a function of the additional jet multiplicity in the lepton+jets channel. Furthermore, the fraction of events with no additional jets is measured in the dilepton channel, as a function of the threshold on the jet transverse momentum. The measurements are compared with predictions from perturbative quantum chromodynamics and no significant deviations are observed.
机译:归一化的差分夸克-反夸克产生的横截面的测量值是使用CMS检测器在LHC质心能量为7 TeV时质子-质子碰撞中射流多重性的函数。使用对应于5.0 fb -1 的综合光度的数据,在dilepton和lepton + jet衰减通道中进行测量。使用关联喷射的程序来衰减顶夸克的乘积, t t math>产量取决于轻子+喷射通道中附加喷射多样性。此外,根据在射流横向动量上的阈值,在离散的通道中测量了没有额外射流的事件分数。将测量结果与微扰量子色动力学的预测结果进行比较,未观察到明显的偏差。

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