标题： 萨达科夫重求和在强子碰撞中瞬时光子产生中的应用 显示英文标题

标题： Sudakov Resummation for Prompt-Photon Production in Hadron Collisions

摘要： 我们给出了在强子碰撞中产生的瞬时光子的横向能量分布中，大-x Sudakov 效应重求和的显式表达式，达到次领头对数（NLL）精度。 碎片化过程在 NLL 层次上不贡献于 Sudakov 重求和。 在 Mellin 空间中，重求和的辐射因子分解为两个初始和一个最终带色荷部分子的独立辐射器的乘积，以及一个描述初始态和最终态之间软胶子干涉的简单因子。 这些公式以 Mellin 矩的形式给出，可以使用标准的逆 Mellin 变换技术进行现象学应用。 本文中给出的计算，当与现有的 DY 和 DIS 产生研究相结合时，完成了在大-x 区域实现夸克密度全局拟合所需的理论基础，具有统一的 NLL 精度。 显示英文摘要

摘要： We present the explicit expressions for the resummation of large-x Sudakov effects in the transverse-energy distribution of prompt-photons produced in hadronic collisions, to next-to-leading logarithmic (NLL) accuracy. Fragmentation processes do not contribute to the Sudakov resummation at NLL level. In Mellin space, the resummed radiative factor factorizes in the product of independent radiators for the two initial and the one final coloured partons appearing in the Born process, times a simple factor describing the soft-gluon interferences between initial and final states. The formulae are given in terms of Mellin moments, and can be used for phenomenological applications using standard techniques for the inverse-Mellin transforms. The calculations presented in this work, when added to the existing works on DY and DIS production, complete the theoretical ground-work necessary to carry out global fits of parton densities with a uniform NLL accuracy in the large-x region.