arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0911.4604hep-phhep-exnucl-exnucl-th
收藏

大横动量强子产生中的高扭动力学

Higher-Twist Dynamics in Large Transverse Momentum Hadron Production

Francois Arleo, Stanley J. Brodsky, Dae Sung Hwang, Anne M. Sickles

摘要:

本文对强子碰撞中大pT强子产生的标度律进行了分析。一个显着的偏离领导扭曲微扰QCD预测在次领先的顺序报告。观察到的差异在xT= 2 pT/sqrt(s)的高值处最大。与此相反,产生的即时光子和喷流表现出的标度行为,这是接近共形极限,在协议的领先扭转的预期。这些结果带来的证据,一个不可忽略的贡献,在强子碰撞,强子直接产生的硬子过程,而不是胶子或夸克喷流碎裂的大pT强子生产的高扭曲过程。给出了RHIC和LHC标度指数的预测,并建议触发孤立的大pT强子产生以增强高扭过程。

英文摘要:

A scaling law analysis of the world data on inclusive large-pT hadron production in hadronic collisions is carried out. A significant deviation from leading-twist perturbative QCD predictions at next-to-leading order is reported. The observed discrepancy is largest at high values of xT=2pT/sqrt(s). In contrast, the production of prompt photons and jets exhibits the scaling behavior which is close to the conformal limit, in agreement with the leading-twist expectation. These results bring evidence for a non-negligible contribution of higher-twist processes in large-pT hadron production in hadronic collisions, where the hadron is produced directly in the hard subprocess rather than by gluon or quark jet fragmentation. Predictions for scaling exponents at RHIC and LHC are given, and it is suggested to trigger the isolated large-pT hadron production to enhance higher-twist processes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑