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arXiv 2408.03129hep-phnucl-th
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半单举深度非弹性散射中的喷注定义与横动量依赖因子化

Jet Definition and Transverse-Momentum-Dependent Factorization in Semi-Inclusive Deep-Inelastic Scattering

Paul Caucal, Edmond Iancu, A. H. Mueller, Feng Yuan

AI总结:

该研究在小x、光子虚度远大于喷注横动量平方的极限下,基于色偶极图像与色玻璃凝聚理论,提出物理喷注定义并证明次领头阶截面可按海夸克TMD分布因子化,且该分布满足普适演化方程。

摘要:

我们利用深度非弹性散射(DIS)的色偶极图像和色玻璃凝聚有效理论,研究了小x下DIS过程中的半单举喷注产生,研究极限为光子虚度Q²远大于产生喷注的横动量平方P_⊥²。在此极限下,截面由准直喷注构型主导,即夸克-反夸克对中,其中一个费米子——在Breit系中为待击中夸克——携带着虚光子的大部分纵向动量。我们证明,DIS中具有物理意义的喷注定义满足:由击中夸克引发的喷注的有效轴由其虚度而非横动量决定。对于这类喷注定义,我们证明次领头阶(NLO)截面可按(海)夸克横动量依赖(TMD)分布进行因子化,而该分布满足普适的Dokshitzer-Gribov-Lipatov-Altarelli-Parisi演化和Sudakov演化。

英文摘要:

Using the colour dipole picture of Deep Inelastic Scattering (DIS) and the Colour Glass Condensate effective theory, we study semi-inclusive jet production in DIS at small $x$ in the limit where the photon virtuality $Q^2$ is much larger than the transverse momentum squared $P_\perp^2$ of the produced jet. In this limit, the cross-section is dominated by aligned jet configurations, that is, quark-antiquark pairs in which one of the fermions -- the would-be struck quark in the Breit frame -- carries most of the longitudinal momentum of the virtual photon. We show that physically meaningful jet definitions in DIS are such that the effective axis of the jet sourced by the struck quark is controlled by its virtuality rather than by its transverse momentum. For such jet definitions, we show that the next-to-leading order (NLO) cross-section admits factorisation in terms of the (sea) quark transverse momentum dependent (TMD) distribution, which in turn satisfies a universal Dokshitzer-Gribov-Lipatov-Altarelli-Parisi and Sudakov evolution.

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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