Non-global logarithms in jet and isolation cone cross sections

被引：38

作者：

Balsiger, Marcel ^{[1
]}

Becher, Thomas ^{[1
]}

Shao, Ding Yu ^{[2
]}

机构：

[1] Univ Bern, Inst Theoret Phys, Albert Einstein Ctr Fundamental Phys, Sidlerstr 5, CH-3012 Bern, Switzerland

[2] CERN, Theoret Phys Dept, CH-1211 Geneva 23, Switzerland

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2018年 / 08期

基金：

瑞士国家科学基金会;

关键词：

Effective Field Theories; Perturbative QCD; Renormalization Group; Resummation; COLOR-SINGLET EXCHANGE; PHOTON PRODUCTION;

D O I：

10.1007/JHEP08(2018)104

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Starting from a factorization theorem in effective field theory, we derive a parton-shower equation for the resummation of non-global logarithms. We have implemented this shower and interfaced it with a tree-level event generator to obtain an automated framework to resum the leading logarithm of non-global observables in the large-N-c limit. Using this setup, we compute gap fractions for dijet processes and isolation cone cross sections relevant for photon production. We compare our results with fixed-order computations and LHC measurements. We find that naive exponentiation is often not adequate, especially when the vetoed region is small, since non-global contributions are enhanced due to their dependence on the veto-region size. Since our parton shower is derived from first principles and based on renormalization-group evolution, it is clear what ingredients will have to be included to perform resummations at subleading logarithmic accuracy in the future.

引用

页数：40

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