Event Generation from Effective Field Theory

Details Event Generation from Effective Field Theory Event Generation from Effective Field Theory

2006-07-27

arxiv.org/abs/hep-ph/0607296v1

Phys.Rev.D76:074004,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

42 pages, 3 figures

Scientific paper

10.1103/PhysRevD.76.074004

A procedure is developed for using Soft Collinear Effective Theory (SCET) to generate fully exclusive events, which can then be compared to data from collider experiments. We show that SCET smoothly interpolates between QCD for hard emissions, and the parton shower for soft emissions, while resumming all large logarithms. In SCET, logarithms are resummed using the renormalization group, instead of classical Sudakov factors, so subleading logarithms can be resummed as well. In addition, all loop effects of QCD can be reproduced in SCET, which allows the effective theory to incorporate next-to-leading and higher-order effects. We also show through SCET that in the soft/collinear limit, successive branchings factorize, a fact which is essential to parton showers, and that the splitting functions of QCD are reproduced. Finally, combining these results, we present a example of an algorithm that incorporates the SCET results into an event generator which is systematically improvable.

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