$\sqrt{s}$=510 GeV $p$$+$$p$ 碰撞中双强子与直接光子-强子角关联的非微扰横向动量效应与演化
高能物理 - 实验
2019-08-13 v2 核实验
摘要
本文测量了 GeV 碰撞中的双强子与孤立直接光子-强子角关联。利用 GeV/ 的带电强子与 GeV/ 的 介子或 GeV/ 的孤立直接光子的关联，研究了由初态部分子横向动量与碎裂产生的末态横向动量所引发的非微扰效应。通过测量垂直于触发粒子（即高 直接光子或 ）轴的离面横向动量分量 来表征非微扰行为。通过对不同触发粒子横向动量（）下的背向包容带电强子产额进行高斯拟合，提取非微扰演化效应。报告了高斯宽度与 的均方根作为相互作用硬标度 的函数，以研究 -h 与直接光子-h 关联之间可能的横向动量依赖演化差异以及因子化破坏效应。发现宽度随 减小，这表明在 碰撞中近背向背的双强子与直接光子-强子产生中，Collins-Soper-Sterman 软因子并未驱动随硬标度的演化。该行为与 Drell-Yan 和半单举深度非弹性散射测量结果相反。
引用
@article{arxiv.1609.04769,
title = {Nonperturbative-transverse-momentum effects and evolution in dihadron and direct photon-hadron angular correlations in $p$$+$$p$ collisions at $\sqrt{s}$=510 GeV},
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journal= {arXiv preprint arXiv:1609.04769},
year = {2019}
}
备注
467 authors, 20 pages, 15 figures, 1 table. Accepted for publication by Phys. Rev. D. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html