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arXiv 2202.01074hep-ph
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从p+Pb碰撞产生的$W^\pm$中提取核PDF的质子PDF不确定性

Proton-PDF uncertainties in extracting nuclear PDFs from $W^\pm$ production in p+Pb collisions

Kari J. Eskola, Petja Paakkinen, Hannu Paukkunen, Carlos A. Salgado

摘要:

讨论了最近CMS协作组测量的8.16 TeV p+Pb碰撞中$W^\pm$玻色子产生对核部分子分布函数(PDF)的约束能力.通过理论协方差矩阵方法和Hessian PDF重新加权,量化了自由质子PDF不确定性对核PDF提取的影响。我们讨论了不同的方法来减轻这些理论的不确定性,包括自归一化,向前向后的比率和核修改比率。结果发现,这些方法都没有提供完美的取消的自由质子PDF,但与目前的数据不确定性,剩余的自由质子PDF的依赖,方便的全球分析,对提取的核修改的影响不大。基于对LHC运行3可获得的统计数据的简单估计,我们认为这将在不久的将来发生变化,因此传播质子PDF不确定性变得更加重要。使用所获得的信息的相关性的自由质子的不确定性,我们还确定了一个新的电荷不对称比,其中取消的质子PDF的不确定性被发现是非常好的。

英文摘要:

We discuss the recent CMS Collaboration measurement of $W^\pm$ boson production in p+Pb collisions at 8.16 TeV in terms of the constraining power on nuclear parton distribution functions (PDFs). The impact of the free-proton PDF uncertainties on the nuclear PDF extraction is quantified by using a theoretical covariance-matrix method and Hessian PDF reweighting. We discuss different ways to mitigate these theoretical uncertainties, including self-normalization, forward-to-backward ratios and nuclear-modification ratios. It is found that none of these methods offer perfect cancellation of the free-proton PDFs but, with the present data uncertainties, the residual free-proton-PDF dependence has, conveniently for the global analyses, little effect on the extraction of the nuclear modifications. Based on a simple estimate of obtainable statistics at the LHC Run 3, we argue that this will change in the near future and it becomes more important to propagate the proton-PDF uncertainties accordingly. Using the obtained information on the correlations of the free-proton uncertainties, we also identify a new charge asymmetry ratio, where the cancellation of the proton-PDF uncertainties is found to be extremely good.

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