论文标题
proton-proton碰撞中的高dilepton群众在$ \ sqrt {s} = $ 13 tev中测量proton-proton碰撞中的drell-yan向前不对称的测量
Measurement of the Drell-Yan forward-backward asymmetry at high dilepton masses in proton-proton collisions at $\sqrt{s} =$ 13 TeV
论文作者
论文摘要
提出了对质子 - 普罗顿碰撞中的drell-yan过程产生的一对相对带电的钩子（Dimuons and Dielectron）对前向后不对称的测量。数据样本对应于138 fb $^{ - 1} $的集成发光度在LHC处收集的cms检测器的质量中心能量为13 TEV。对大于170 GEV的质量的Lepton对质量的函数测量不对称，并与标准模型预测进行了比较。两个频道和完整质量范围的包含度量的不对称性为0.612 $ \ pm $ 0.005（Stat）$ \ pm $ 0.007（SYST）。作为Lepton风味普遍性的测试，也测量了Dimuon和Dielectron不对称的差异。没有观察到与标准模型预测的统计学意义偏差。测量结果用于设定额外的玻色子存在的限制。对于顺序标准模型中的z'玻色子，观察到的（预期）Z质量的95％置信度下限为4.4（3.7）TEV。
A measurement of the forward-backward asymmetry of pairs of oppositely charged leptons (dimuons and dielectrons) produced by the Drell-Yan process in proton-proton collisions is presented. The data sample corresponds to an integrated luminosity of 138 fb$^{-1}$ collected with the CMS detector at the LHC at a center-of-mass energy of 13 TeV. The asymmetry is measured as a function of lepton pair mass for masses larger than 170 GeV and compared with standard model predictions. An inclusive measurement across both channels and the full mass range yields an asymmetry of 0.612 $\pm$ 0.005 (stat) $\pm$ 0.007 (syst). As a test of lepton flavor universality, the difference between the dimuon and dielectron asymmetries is measured as well. No statistically significant deviations from standard model predictions are observed. The measurements are used to set limits on the presence of additional gauge bosons. For a Z' boson in the sequential standard model the observed (expected) 95% confidence level lower limit on the Z' mass is 4.4 (3.7) TeV.
