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arXiv 1602.07152hep-ex
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在sqrt(s)= 8 TeV时pp碰撞中Z γ到nu巴γ产生截面的测量和反常Z-Z-γ和Z-γ-γ三线性规范玻色子耦合的限制

Measurement of the Z gamma to nu nu-bar gamma production cross section in pp collisions at sqrt(s) = 8 TeV and limits on anomalous Z-Z-gamma and Z-gamma-gamma trilinear gauge boson couplings

CMS Collaboration

摘要:

本文利用LHC上CMS探测器收集的19.6毫微微垒的积分亮度数据,测量了sqrt(s)= 8 TeV pp碰撞中Z γ到nu-bar γ产生的截面。该测量基于对具有大的缺失能量的事件的观测,并且具有横向动量高于145 GeV且绝对赝快度在|eta| < 1.44的范围内的单光子。测得的Z伽马-努巴伽马生产截面为52.7 +/- 2.1(静态)+/- 6.4(系统)+/- 1.4(光)fb,与标准模型预测的50.0 + 2.4 - 2.2 fb吻合良好。对光子横动量谱的研究给出了迄今为止对反常Z-Z-gamma和Z-gamma-gamma三线性规范玻色子耦合的最严格的限制。

英文摘要:

A measurement of the Z gamma to nu nu-bar gamma production cross section in pp collisions at sqrt(s) = 8 TeV is presented, using data corresponding to an integrated luminosity of 19.6 inverse femtobarns collected with the CMS detector at the LHC. This measurement is based on the observation of events with large missing energy and with a single photon with transverse momentum above 145 GeV and absolute pseudorapidity in the range |eta| < 1.44. The measured Z gamma to nu nu-bar gamma production cross section, 52.7 +/- 2.1(stat) +/- 6.4 (syst) +/- 1.4 (lumi) fb, agrees well with the standard model prediction of 50.0 +2.4 -2.2 fb. A study of the photon transverse momentum spectrum yields the most stringent limits to date on the anomalous Z-Z-gamma and Z-gamma-gamma trilinear gauge boson couplings.

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