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

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Impact of lepton pT threshold on charge asymmetry predictions for inclusive W boson production in pp collisions at 13 TeV
Chinese Physics C ( IF 3.6 ) Pub Date : 2021-07-23 , DOI: 10.1088/1674-1137/ac03ad
Kadir Ocalan ₁

Affiliation

This paper presents the impact of the lepton transverse momentum $p^{l}_{T}$ threshold on the $W$ boson charge asymmetry predictions in perturbative QCD for the inclusive $W^{\pm}+X \rightarrow l^{\pm} \nu +X$ production in proton-proton ( $pp$ ) collisions. The predictions are obtained at various low- $p^{l}_{T}$ thresholds $p^{l}_{T} \gt$ 20, 25, 30, and 40 GeV in a fiducial region encompassing both the central and forward detector acceptances in terms of the lepton pseudorapidity $0 \leq \eta_{l} \leq 4.5$ . The predicted distributions for the lepton charge asymmetry, which is defined by $\eta_{l}$ ( $A_{\eta_{l}}$ ), at the next-to-next-to-leading order (NNLO) accuracy are compared with the CMS and LHCb data at 8 TeV center-of-mass collision 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 other PDF sets that are tested. The 13 TeV predictions using various $p^{l}_{T}$ thresholds are reported for $A_{\eta_{l}}$ and the charge asymmetries that are defined in terms of the differential cross sections in bins of the $W$ boson rapidity $y_{W}$ ( $A_{y_{W}}$ ) and transverse momentum $p^{W}_{T}$ ( $A_{p^{W}_{T}}$ ). The NNLO predictions for the $A_{\eta_{l}}$ , $A_{y_{W}}$ , and $A_{p^{W}_{T}}$ distributions are assessed to be in close correlation with the $p^{l}_{T}$ value. The $A_{\eta_{l}}$ and $A_{y_{W}}$ distributions are particularly shown to be more correlated at a higher $p^{l}_{T}$ threshold. The $A_{p^{W}_{T}}$ 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 predicted distributions from various $p^{l}_{T}$ 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 $10^{-4} \lt x \lt 1$ .

中文翻译：

轻子 pT 阈值对 13 TeV pp 碰撞中包容性 W 玻色子产生的电荷不对称预测的影响

本文介绍了轻子横向动量 $p^{l}_{T}$ 阈值对 $W$ 微扰 QCD 中玻色子电荷不对称预测的影响，用于 $W^{\pm}+X \rightarrow l^{\pm} \nu +X$ 质子 - 质子 ( $pp$ ) 碰撞中的包容性产生。预测是在 20、25、30和 40 GeV 的各种低 $p^{l}_{T}$ 阈值下获得的， $p^{l}_{T} \gt$ 基准区域包括在轻子赝快速度方面的中心和前向探测器接受度 $0 \leq \eta_{l} \leq 4.5$ 。轻子电荷不对称的预测分布，定义为 $\eta_{l}$ ( $A_{\eta_{l}}$ )，以次先行顺序 (NNLO) 精度与 8 TeV 质心碰撞能量下的 CMS 和 LHCb 数据进行比较。8 TeV 预测在引用的不确定性内相当好地再现了数据。CT14 部分分布函数 (PDF) 模型的预测与测试的其他 PDF 集的数据的一致性稍好。 $p^{l}_{T}$ 报告了使用各种阈值的 13 TeV 预测， $A_{\eta_{l}}$ 以及根据 $W$ 玻色子速度 $y_{W}$ ( $A_{y_{W}}$ ) 和横向动量 $p^{W}_{T}$ ( $A_{p^{W}_{T}}$ )箱中的微分横截面定义的电荷不对称性。该NNLO预测的 $A_{\eta_{l}}$ ， $A_{y_{W}}$ 和 $A_{p^{W}_{T}}$ 分布被评估为与密切相关 $p^{l}_{T}$ 价值。的 $A_{\eta_{l}}$ 和 $A_{y_{W}}$ 分布特别地示出在更高的更相关 $p^{l}_{T}$ 的阈值。的 $A_{p^{W}_{T}}$ 分布还报道从通过包含下一个到下一个到下一个要领先对数（N的合并以提高的精度预测³ LL）校正，即，在NNLO + N ³ LL。 $p^{l}_{T}$ 就在部分子动量分数范围内对比值 $u$ 和 $d$ 夸克分布函数提供更多约束的能力而言，来自各种阈值的预测分布代表了更精细的探测 $10^{-4} \lt x \lt 1$ 。

更新日期：2021-07-23

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