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Measurements of W(+/-)Z production cross sections in pp collisions at root s=8 TeV with the ATLAS detector and limits on anomalous gauge boson self-couplings

机译:Root S = 8 TEV的PP碰撞中的W(+/-)Z生产横截面的测量与ATLAS检测器,并限制异常仪表玻色子自耦合

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This paper presents measurements of W(+/-)Z production in pp collisions at a center-of-mass energy of 8 TeV. The gauge bosons are reconstructed using their leptonic decay modes into electrons and muons. The data were collected in 2012 by the ATLAS experiment at the Large Hadron Collider and correspond to an integrated luminosity of 20.3 fb(-1). The measured inclusive cross section in the detector fiducial region is sigma W(+/-)Z -> l'nu ll = 35.1 +/- 0.9(stat) +/- 0.8(sys) +/- 0.8(lumi) fb, for one leptonic decay channel. In comparison, the next-to-leading-order Standard Model expectation is 30.0 +/- 2.1 fb. Cross sections for W(+)Z and W(-)Z production and their ratio are presented as well as differential cross sections for several kinematic observables. Limits on anomalous triple gauge boson couplings are derived from the transverse mass spectrum of the W(+/-)Z system. From the analysis of events with a W and a Z boson associated with two or more forward jets an upper limit at 95% confidence level on the W(+/-)Z scattering cross section of 0.63 fb, for each leptonic decay channel, is established, while the Standard Model prediction at next-to-leading order is 0.13 +/- 0.01 fb. Limits on anomalous quartic gauge boson couplings are also extracted.
机译:本文介绍了8 TEV的质量中心的PP碰撞中的W(+/-)Z生产的测量。使用它们的Leptonic衰减模式重建测量玻色子,进入电子和μONs。 2012年通过大型特罗龙撞机的地图集实验收集数据,并对应于20.3FB(-1)的集成光度。检测器基准区域中的测量的包容性横截面是Sigma W(+/-)Z - > L'nu LL = 35.1 +/- 0.9(stat)+/- 0.8(Sys)+/- 0.8(Lumi)FB,对于一个轻型衰减频道。相比之下,下一阶标准模型期望是30.0 +/- 2.1 FB。对于W(+)Z和W( - )Z产生的横截面及其比例以及用于几种运动道可观察的差分横截面。异常三仪型玻色子耦合的限制来自W(+/-)Z系统的横向质谱。根据与W的事件的分析和与两个或多个前进喷射相关联的Z玻色子的Z·ZOSON在0.63 FB的W(+/-)Z散射截面上的95%置信水平上的上限为0.63 fb,对于每个Leptonic衰减通道,是建立,而在下面的下一级订单上的标准模型预测为0.13 +/- 0.01 FB。还提取了异常的四分之一计玻色子偶联的限制。

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