Non-global logarithms in jet and isolation cone cross sections

作者：Balsiger Marcel^*; Becher Thomas; Shao Ding Yu

来源：The Journal of High Energy Physics, 2018, 2018(8): 104.

DOI：10.1007/JHEP08(2018)104

• Effective Field Theories
• Perturbative QCD
• Renormalization Group
• Resummation

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.

• 出版日期2018-8-17