Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-07-05
Phys.Rev.D83:034011,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
54 pages, 24 figures, plus a few appendices. v2: included a parameter "eta" to account for energy loss, title improved, journa
Scientific paper
10.1103/PhysRevD.83.034011
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.
Baumgart Matthew
Marcantonini Claudio
Stewart Iain W.
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