Constraining parton distribution functions from neutral current Drell-Yan measurements
Constraining parton distribution functions from neutral current Drell-Yan measurements
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DOI：
10.1103/physrevd.98.013003
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发表时间：
2017-12
影响因子：
5
通讯作者：
E. Accomando;J. Fiaschi;F. Hautmann;S. Moretti
中科院分区：
文献类型：
--
作者：
E. Accomando;J. Fiaschi;F. Hautmann;S. Moretti
本文研究了质子pp→γ π，Z→+-（其中=e，μ）过程中的截面σ和前后不对称性（AFB），以确定质子的部分子分布函数（PDF）。我们表明，一旦映射到双轻子末态的不变质量M（）中，两个可观测量σ和AFB都显示出一个统计误差，该误差目前与分配给现有PDF集的统计误差具有竞争力，并且随着LHC运行II中累积的光度的增加，该误差将迅速变得小于后者。这一陈述适用于峰上和峰外M（）区域，既（刚好）低于它，也（刚好）高于它，从而提供了一种将夸克PDF约束在相当大的（x，Q2）范围内的方法。
We study the cross section σ and forward-backward asymmetry (AFB) in the process pp→γ∗,Z→+- (with =e, μ) for determinations of parton distribution functions (PDFs) of the proton. We show that, once mapped in the invariant mass of the dilepton final state, M(), both observables, σ and AFB, display a statistical error which is presently competitive with that assigned to the existing PDF sets and which will rapidly become smaller than the latter as the luminosity being accumulated at Run-II of the LHC grows. This statement is applicable to both on-peak and off-peak M() regions, both (just) below and above it, thereby offering a means of constraining the quark PDFs over a sizable (x,Q2) range.