Impact of lepton pT threshold on charge asymmetry predictions for inclusive W boson production in pp collisions at 13 TeV

• 作者: Kadir Ocalan
• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: PARTICLES AND FIELDS
• 页码范围: 36-44
• 页数: 9页
• 语种: 英文
• DOI: 10.1088/1674-1137/ac03ad

摘要

This paper presents the impact of the lepton transverse momentum plT threshold on the W boson charge asymmetry predictions in perturbative QCD for the inclusive W±+X → l±v+X production in proton-proton(pp)collisions.The predictions are obtained at various low-plT thresholds plT＞20,25,30,and 40 GeV in a fiducial re-gion encompassing both the central and forward detector acceptances in terms of the lepton pseudorapidity 0＜ηl≤4.5.The predicted distributions for the lepton charge asymmetry,which is defined by ηl(Aηl),at the next-to-next-to-leading order(NNLO)accuracy are compared with the CMS and LHCb data at 8 TeV center-of-mass col-lision energy.The 8 TeV predictions reproduce the data fairly well within the quoted uncertainties.The predictions from the CT14 parton distribution function(PDF)model are in a slightly better agreement with the data over the oth-er PDF sets that are tested.The 13 TeV predictions using various plT thresholds are reported for Aηl and the charge asymmetries that are defined in terms of the differential cross sections in bins of the W boson rapidity yw(AyW)and transverse momentum pWT(ApWT).The NNLO predictions for the Aηl,AyW,and A pWT distributions are assessed to be in close correlation with the plT value.The Aηl and AyW distributions are particularly shown to be more correlated at a higher plT threshold.The ApwT distributions are also reported from the merged predictions with improved accuracy by the inclusion of the next-to-next-to-next-to-leading logarithm(N3LL)corrections,i.e.,at NNLO+N3LL.The pre-dicted distributions from various plT thresholds represent a finer probe in terms of the capability to provide more constraints on the ratio of u and d quark distribution functions in the parton momentum fraction range 10-4＜x＜1.