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arXiv 2103.14495hep-ph
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用低$x$改进的TMD方法研究重夸克对的轻子和强子产生

Low-$x$ improved TMD approach to the lepto- and hadroproduction of a heavy-quark pair

Tolga Altinoluk, Cyrille Marquet, Pieter Taels

摘要:

我们在ITMD分解框架下研究了稀密碰撞中重夸克对的轻子和强子产生。由于非零夸克质量和/或非零光子虚性的存在,新的贡献出现相比,光和hadroproduction的dijets,ITMD框架最初是来自的情况下。额外项对非完全线性极化的胶子很敏感。在小的$x$,这些胶子只有在考虑饱和效应时才会出现,而且是以适当的方式出现。结果,在胶子完全线性极化的线性小$x$框架中,这种贡献是不存在的。然而,我们表明,它们并不总是可以忽略不计,即使是大胶子横动量,由于离壳硬因子的行为。

英文摘要:

We study lepto- and hadroproduction of a heavy-quark pair in the ITMD factorization framework for dilute-dense collisions. Due to the presence of a nonzero quark mass and/or nonzero photon virtuality, new contributions appear compared to the cases of photo- and hadroproduction of dijets, for which the ITMD framework was originally derived. The extra terms are sensitive to gluons that are not fully linearly polarized. At small $x$ those gluons emerge only when saturation effects are taken into account, and in a proper way. As a result, in linear small-$x$ frameworks where gluon are fully linearly polarized, such contributions are absent. We show however that they are not always negligible, even for large gluon transverse momentum, due to the behavior of the off-shell hard factors.

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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