arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1803.04413hep-ph
收藏

从潜在事件敏感到不敏感:因子分解和恢复

From Underlying Event Sensitive To Insensitive: Factorization and Resummation

Daekyoung Kang, Yiannis Makris, Thomas Mehen

摘要:

本文研究Drell-Yan过程的横能谱。横向能量是在由(伪)快度截止定义的中心区域内测量的。软共线有效理论(SCET)被用来因式分解截面,并恢复大的快度截断和广泛分离的尺度比出现在固定的顺序结果的时间。我们开发了一个框架,它可以顺利地插在不同区域的频谱,并最终匹配到固定的顺序的结果。通过这种方式,获得了初始状态辐射对测量的贡献的可靠计算。通过比较Drell-Yan和Pythia的结果,我们得到了一个简单的模型,描述了多部分子相互作用的贡献。一个模型,很少或根本没有依赖的主要过程给出的结果与模拟一致。基于这一观察,我们提出了MPI不敏感的测量。这些可观的是不敏感的MPI的贡献,在Pythia实现,我们对纯微扰的结果与标准的共线因式分解。

英文摘要:

In this paper we study the transverse energy spectrum for the Drell-Yan process. The transverse energy is measured within the central region defined by a (pseudo-) rapidity cutoff. Soft-collinear effective theory (SCET) is used to factorize the cross section and resum large logarithms of the rapidity cutoff and ratios of widely separated scales that appear in the fixed order result. We develop a framework which can smoothly interpolate between various regions of the spectrum and eventually match onto the fixed order result. This way a reliable calculation is obtained for the contribution of the initial state radiation to the measurement. By comparing our result for Drell-Yan against Pythia we obtain a simple model that describes the contribution from multiparton interactions (MPI). A model with little or no dependence on the primary process gives results in agreement with the simulation. Based on this observation we propose MPI insensitive measurements. These observables are insensitive to the MPI contributions as implemented in Pythia and we compare against the purely perturbative result obtained with the standard collinear factorization.

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。

↑