Systematic improvement of parton showers with effective theory
Author(s)Baumgart, Matthew; Marcantonini, Claudio; Stewart, Iain W.
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We carry out a systematic classification and computation of next-to-leading order kinematic power corrections to the fully differential cross section in the parton shower. To do this we devise a map between ingredients in a parton shower and operators in a traditional effective field theory framework using a chain of soft-collinear effective theories. Our approach overcomes several difficulties including avoiding double counting and distinguishing approximations that are coordinate choices from true power corrections. Branching corrections can be classified as hard-scattering, that occur near the top of the shower, and jet-structure, that can occur at any point inside it. Hard-scattering corrections include matrix elements with additional hard partons, as well as power suppressed contributions to the branching for the leading jet. Jet-structure corrections require simultaneous consideration of potential 1-->2 and 1-->3 branchings. The interference structure induced by collinear terms with subleading powers remains localized in the shower.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review D
American Physical Society
Baumgart, Matthew, Claudio Marcantonini, and Iain Stewart. “Systematic Improvement of Parton Showers with Effective Theory.” Physical Review D 83.3 (2011)[57 pages] © 2011 American Physical Society.
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