arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.02288hep-ph
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旁观者模型中与横动量相关的胶子分布函数

Transverse-momentum-dependent gluon distribution functions in a spectator model

Alessandro Bacchetta, Francesco Giovanni Celiberto, Marco Radici, Pieter Taels

摘要:

本文提出了一个计算核子中胶子横动量相关分布的模型。该模型基于这样的假设:核子可以发射胶子,而发射后剩下的粒子被视为单个旁观粒子。这个旁观者粒子被认为是在壳层上的,但它的质量可以取一个连续的值范围,由谱函数描述。核子-胶子-旁观者耦合用一个包含两个形状因子的有效顶点来描述。我们固定的模型参数,以获得最好的协议与共线胶子分布提取的全球拟合。本文研究了核子内胶子在各种极化组合下的动量空间层析成像。这些可以用来预测在当前和未来的对撞机设施的胶子TMD研究相关的观测值。

英文摘要:

We present a model calculation of transverse-momentum-dependent distributions (TMDs) of gluons in the nucleon. The model is based on the assumption that a nucleon can emit a gluon, and what remains after the emission is treated as a single spectator particle. This spectator particle is considered to be on-shell, but its mass is allowed to take a continuous range of values, described by a spectral function. The nucleon-gluon-spectator coupling is described by an effective vertex containing two form factors. We fix the model parameters to obtain the best agreement with collinear gluon distributions extracted from global fits. We study the tomography in momentum space of gluons inside nucleons for various combinations of their polarizations. These can be used to make predictions of observables relevant for gluon TMD studies at current and future collider facilities.

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。

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