Systematic improvement of parton showers with effective theory

Journal Article · Tue Feb 01 00:00:00 EST 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.034011· OSTI ID:21504871

Baumgart, Matthew ^[1]; Marcantonini, Claudio; Stewart, Iain W ^[2]

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1. Jefferson Physical Laboratory, Harvard University, Cambridge, Massachusetts 02138 (United States)
2. Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

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{yields}2 and 1{yields}3 branchings. The interference structure induced by collinear terms with subleading powers remains localized in the shower.

• OSTI ID: 21504871
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 3; Other Information: DOI: 10.1103/PhysRevD.83.034011; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
APPROXIMATIONS
BRANCHING RATIO
CLASSIFICATION
COMPUTERIZED SIMULATION
COORDINATES
CORRECTIONS
DIFFERENTIAL CROSS SECTIONS
FIELD THEORIES
GLUONS
INTERFERENCE
MATRIX ELEMENTS
SCATTERING
SHOWERS
BOSONS
CALCULATION METHODS
CROSS SECTIONS
DIMENSIONLESS NUMBERS
SIMULATION