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Measurements of t(t)over-bar spin correlations and top quark polarization using dilepton final states in pp collisions at root s=8 TeV

机译:使用Dilepton Final状态在Root S = 8 Tev的PP碰撞中使用Dilepton Final状态的T(t)过度旋转相关和顶部夸克极化的测量

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Measurements of the top quark-antiquark (t (t) over bar) spin correlations and the top quark polarization are presented for t (t) over bar pairs produced in pp collisions at root s = 8 TeV. The data correspond to an integrated luminosity of 19.5 fb(-1) collected with the CMS detector at the LHC. The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The spin correlations and polarization are measured from the angular distributions of the two selected leptons, both inclusively and differentially, with respect to the invariant mass, rapidity, and transverse momentum of the t (t) over bar system. The measurements are unfolded to the parton level and found to be in agreement with predictions of the standard model. A search for new physics in the form of anomalous top quark chromo moments is performed. No evidence of new physics is observed, and exclusion limits on the real part of the chromo-magnetic dipole moment and the imaginary part of the chromo-electric dipole moment are evaluated.
机译:顶部Quark-antiquark(T(t)上方的T(t)旋转相关性和顶部痕迹极化的测量对于在根S = 8 Tev的PP碰撞中产生的T(t)呈现T(t)。数据对应于在LHC处的CMS检测器收集的19.5FB(-1)的集成光度。使用具有两个相对电荷的leptons(电子或muONs)和两个或更多个喷射的事件来执行测量,其中至少一个喷射被识别为源自底夸克。旋转相关性和极化从两个选定的leptons的角度分布,包括在条形系上的t(t)的不变质量,快速和横向动量的不变质量,速度和横向动量。测量值对Parton级别展开,并发现与标准模型的预测一致。以异常顶部夸克色度矩的形式搜索新物理学。没有观察到新物理学的证据,并且评估了染色体偶极偶像力矩的实部的排除限制以及铬电偶极矩的虚部。

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