Estimates of Z′ couplings within data on the AFB for Drell-Yan process at the LHC at s=7 and 8 TeV

作     者：A. Pevzner V. Skalozub 

作者机构：Theoretical Physics Department Oles Honchar Dnipropetrovsk National University 72 Gagarin Avenue Dnipro 49010 Ukraine 

出 版 物：《Physical Review D》 (物理学评论D辑：粒子、场、重力与宇宙学)

年 卷 期：2016年第94卷第1期

页      面：015029-015029页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

主　　题：Extensions of gauge sector Leptonic, semileptonic & radiative decays Precision measurements 

摘      要：A model-independent search for the Abelian Z′ gauge boson in the Drell-Yan process at the LHC at s=7 and 8 TeV is fulfilled. Estimations of the Z′ axial-vector coupling af2 to the standard model fermions, the couplings of the axial vector to lepton vector currents afvl, and the couplings of the axial vector to quark vector currents afvq are derived within data on the forward-backward asymmetry presented by the CMS Collaboration. The analysis takes into consideration the behavior of the differential cross section, which exhibits itself if the derived already special relations between the couplings proper to the renormalizable theories are accounted for. In particular, they hold in all the models of Abelian Z′ usually considered in the model-dependent analysis of the LHC data. The coupling values are estimated at ∼92% confidence level by means of the maximum likelihood function. They weakly depend on the Z′ mass in the investigated interval 1.2 TeVmZ′5 TeV. Taking into account the dependence of Z−Z′ mixing angle θ0 on mZ′ and the LEP constraints |θ0|∼10−3–10−4, the optimistic limits on mZ′ are established as 3mZ′7–8 TeV. Comparison with the results of other authors is given.