arXiv 1502.025172015-02hep-phhep-exnucl-ex

部分子分布统计方法的新发展：直到LHC能量的试验和预言

New developments in the statistical approach of parton distributions: tests and predictions up to LHC energies

Claude Bourrely, Jacques Soffer

备注：: 40 pages, 21 figures, revised version to appear in Nuclear Physics A
DOI：: 10.1016/j.nuclphysa.2015.06.018

摘要：

通过考虑一组更大的最近和准确的深度非弹性散射实验结果，重新审视了十多年前提出的量子统计部分子分布方法。它使我们能够通过一个新的测定的部分子分布，以改善数据的描述。这种全球次领先的顺序QCD分析导致了一个很好的描述的几个结构功能，涉及非极化部分子分布和螺旋度分布，在广泛的$x$和$Q^2$，并在一个相当小的自由参数。有几个具有挑战性的问题，特别是确认一个大的正胶子螺旋度分布。这种理论方法的预测将测试单喷生产和电荷不对称的$W^{\pm}$生产$\bar p p$和$p p$碰撞到大型强子对撞机的能量，使用最近的数据和即将到来的实验结果。

英文摘要：

The quantum statistical parton distributions approach proposed more than one decade ago is revisited by considering a larger set of recent and accurate Deep Inelastic Scattering experimental results. It enables us to improve the description of the data by means of a new determination of the parton distributions. This global next-to-leading order QCD analysis leads to a good description of several structure functions, involving unpolarized parton distributions and helicity distributions, in a broad range of $x$ and $Q^2$ and in terms of a rather small number of free parameters. There are several challenging issues and in particular the confirmation of a large positive gluon helicity distribution. The predictions of this theoretical approach will be tested for single-jet production and charge asymmetry in $W^{\pm}$ production in $\bar p p$ and $p p$ collisions up to LHC energies, using recent data and also for forthcoming experimental results.

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