Systematic improvement of parton showers with effective theory
Name
Baumgart-2011-Systematic improveme.pdf
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2.01 MB
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Author(s)
Baumgart, Matthew
Marcantonini, Claudio
Stewart, Iain W.
Date Issued
February 2011
Journal
Physical Review D
Publisher
American Physical Society
Citation
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.
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.83.034011
