arXiv 1002.25372010-02-12hep-ph

在LHC上用pA碰撞测试核部分子分布

Testing nuclear parton distributions with pA collisions at the LHC

Paloma Quiroga-Arias, Jose Guilherme Milhano, Urs Achin Wiedemann

备注：: 4 pages, 3 figures
发表信息：: Phys.Rev.C82:034903,2010
DOI：: 10.1103/PhysRevC.82.034903

摘要：

基于电子-质子和强子对撞机实验的大数据集的整体微扰QCD分析，提供了质子中部分子分布函数（PDF）的严格约束。近年来，将这些分析扩展到核部分子分布（nPDF）引起了人们的极大兴趣。nPDF需要作为基准的热QCD物质在核-核碰撞的表征，并吸引进一步的兴趣，因为它们可能会显示新的签名的非线性密度依赖QCD演化。然而，它是不知道从第一原理是否因式分解的长程现象到过程无关的部分子分布，这是全球PDF提取的质子，延伸到核效应。因此，评估基准计算的nPDF的可靠性超出了测试其提取的数值准确性，并需要因式分解假设的现象学测试。在这里，我们认为，在大型强子对撞机的质子-核碰撞计划将提供一组测量允许前所未有的测试的因子分解假设的基础上的全球nPDF拟合。

英文摘要：

Global perturbative QCD analyses, based on large data sets from electron-proton and hadron collider experiments, provide tight constraints on the parton distribution function (PDF) in the proton. The extension of these analyses to nuclear parton distributions (nPDF) has attracted much interest in recent years. nPDFs are needed as benchmarks for the characterization of hot QCD matter in nucleus-nucleus collisions, and attract further interest since they may show novel signatures of non-linear density-dependent QCD evolution. However, it is not known from first principles whether the factorization of long-range phenomena into process-independent parton distribution, which underlies global PDF extractions for the proton, extends to nuclear effects. As a consequence, assessing the reliability of nPDFs for benchmark calculations goes beyond testing the numerical accuracy of their extraction and requires phenomenological tests of the factorization assumption. Here we argue that a proton-nucleus collision program at the LHC would provide a set of measurements allowing for unprecedented tests of the factorization assumption underlying global nPDF fits.

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