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Title: Soft evolution of multi-jet final states

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [1];  [2];  [3]
  1. Gottingen Univ. (Germany)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States)

We present a new framework for computing resummed and matched distributions in processes with many hard QCD jets. The intricate color structure of soft gluon emission at large angles renders resummed calculations highly non-trivial in this case. We automate all ingredients necessary for the color evolution of the soft function at next-to-leading-logarithmic accuracy, namely the selection of the color bases and the projections of color operators and Born amplitudes onto those bases. Explicit results for all QCD processes with up to 2 → 5 partons are given. We also devise a new tree-level matching scheme for resummed calculations which exploits a quasi-local subtraction based on the Catani-Seymour dipole formalism. We implement both resummation and matching in the Sherpa event generator. As a proof of concept, we compute the resummed and matched transverse-thrust distribution for hadronic collisions.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); High Energy Physics (HEP)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1185177
Report Number(s):
SLAC-PUB-16143; TRN: US1500520
Journal Information:
Journal of High Energy Physics (Online), Vol. 2015, Issue 2; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Momentum conservation and unitarity in parton showers and NLL resummation journal January 2018

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