用超外围 pA 碰撞中的(textrm{c}\overline{\textrm{c}})相关性探测质子结构

IF 5 1区 物理与天体物理 Q1 PHYSICS, PARTICLES & FIELDS
Barbara Linek, Agnieszka Łuszczak, Marta Łuszczak, Roman Pasechnik, Wolfgang Schäfer, Antoni Szczurek
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引用次数: 0

摘要

我们研究了超外围pA对撞中的排他性衍射(c\overline{c} \)光生成。该形式主义利用了未积分胶子分布的非对角广义,即所谓的广义横动量相关分布(GTMDs)。我们提出了两种不同的公式。第一种是直接基于动量空间的胶子 GTMD 参数化。另一种方法是将 GTMD 计算为偶极子-核子散射振幅 N(Y, \( \overrightarrow{r} \)⊥, \( \overrightarrow{b} \)⊥) 的傅立叶变换。后一种方法需要本文讨论的一些额外正则化。本文使用了文献中不同的偶极子振幅。与之前的文献计算相比,我们对整个相空间进行了积分,因此得到了现实条件下的截面。我们给出了c或\(\overline{c}\)的快速性分布、\(c\overline{c}\)对的横动量、四动量传递平方以及c和\(\overline{c}\)横动量之和与之差的方位相关性。方位相关性的部分原因是所谓的椭圆胶子维格纳分布。不同的模型会导致不同的方位角调制。调制一般小于 5%。它们取决于计算所选择的横动量范围。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Probing proton structure with \( \textrm{c}\overline{\textrm{c}} \) correlations in ultraperipheral pA collisions

We study the exclusive diffractive \( c\overline{c} \) photoproduction in ultraperipheral pA collisions. The formalism makes use of off-diagonal generalizations of the unintegrated gluon distribution, the so-called generalized transverse momentum dependent distributions (GTMDs). We present two different formulations. The first one is based directly on gluon GTMD parametrizations in momentum space. Another option is the calculation of the GTMD as a Fourier transform of the dipole-nucleon scattering amplitude N(Y, \( \overrightarrow{r} \), \( \overrightarrow{b} \)). The latter approach requires some extra regularization discussed in the paper. Different dipole amplitudes from the literature are used. Compared to previous calculations in the literature, we integrate over the full phase space and therefore cross sections for realistic conditions are obtained. We present distributions in rapidity of c or \( \overline{c} \), transverse momentum of the \( c\overline{c} \) pair, four-momentum transfer squared as well as the azimuthal correlation between a sum and a difference of the c and \( \overline{c} \) transverse momenta. The azimuthal correlations are partially due to the so-called elliptic gluon Wigner distribution. Different models lead to different modulations in the azimuthal angle. The modulations are generally smaller than 5%. They depend on the range of transverse momentum selected for the calculation.

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来源期刊
Journal of High Energy Physics
Journal of High Energy Physics PHYSICS, PARTICLES & FIELDS-
CiteScore
10.00
自引率
46.30%
发文量
2107
审稿时长
12 weeks
期刊介绍: The aim of the Journal of High Energy Physics (JHEP) is to ensure fast and efficient online publication tools to the scientific community, while keeping that community in charge of every aspect of the peer-review and publication process in order to ensure the highest quality standards in the journal. Consequently, the Advisory and Editorial Boards, composed of distinguished, active scientists in the field, jointly establish with the Scientific Director the journal''s scientific policy and ensure the scientific quality of accepted articles. JHEP presently encompasses the following areas of theoretical and experimental physics: Collider Physics Underground and Large Array Physics Quantum Field Theory Gauge Field Theories Symmetries String and Brane Theory General Relativity and Gravitation Supersymmetry Mathematical Methods of Physics Mostly Solvable Models Astroparticles Statistical Field Theories Mostly Weak Interactions Mostly Strong Interactions Quantum Field Theory (phenomenology) Strings and Branes Phenomenological Aspects of Supersymmetry Mostly Strong Interactions (phenomenology).
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