"Table 35" of "Measurement of t-tbar production with additional jet activity, including b quark jets, in the dilepton channel using pp collisions at sqrt(s) = 8TeV"

Jet multiplicity distributions in top quark pair (ttbar) events are measured in pp collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC using a data set corresponding to an integrated luminosity of 19.7 inverse-femtobarns. The measurement is performed in the dilepton decay channels (e+ e-, mu+ mu-, and e+/- mu-/+). The absolute and normalized differential cross sections for t-tbar production are measured as a function of the jet multiplicity in the event for different jet transverse momentum thresholds and the kinematic properties of the leading additional jets. The differential t-tbar-b and t-tbar-b-bbar cross sections are presented for the first time as a function of the kinematic properties of the leading additional b jets. Furthermore, the fraction of events without additional jets above a threshold is measured as a function of the transverse momenta of the leading additional jets and the scalar sum of the transverse momenta of all additional jets. The data are compared and found to be consistent with predictions from several perturbative quantum chromodynamics event generators and a next-to-leading order calculation.利用大型强子对撞机（LHC）上的CMS探测器，针对质心系能量为8 TeV的质子-质子碰撞过程，采集了对应积分亮度为19.7反飞靶的数据集，对顶夸克对（ttbar）事件的喷注多重数分布进行了测量。本次测量针对双轻子衰变道（e⁺e⁻、μ⁺μ⁻以及e⁺/⁻μ⁻/⁺末态）开展。针对不同喷注横向动量阈值与领头额外喷注的运动学特性，我们以事件内喷注多重数为变量，测量了顶夸克对产生的绝对与归一化微分截面。我们首次给出了包含单个b喷注的顶夸克对（ttbar-b）与包含一对正反b喷注的顶夸克对（ttbar-b-bbar）的产生微分截面，其分布随领头额外b喷注的运动学特性变化。此外，我们还测量了不存在横向动量超过给定阈值的额外喷注的事件占比，该占比随领头额外喷注的横向动量以及所有额外喷注的横向动量标量和变化。将本测量数据与多款微扰量子色动力学事件产生器的预言以及次领头阶（NLO）计算结果进行对比后发现，实验数据与理论预言一致。