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Title: Combining states without scale hierarchies with ordered parton showers

Here, we present a parameter-free scheme to combine fixed-order multi-jet results with parton-shower evolution. The scheme produces jet cross sections with leading-order accuracy in the complete phase space of multiple emissions, resumming large logarithms when appropriate, while not arbitrarily enforcing ordering on momentum configurations beyond the reach of the parton-shower evolution equation. This then requires the development of a matrix-element correction scheme for complex phase-spaces including ordering conditions as well as a systematic scale-setting procedure for unordered phase-space points. Our algorithm does not require a merging-scale parameter. We implement the new method in the Vincia framework and compare to LHC data.
Authors:
 [1] ;  [2]
  1. Monash Univ., Melbourne, VIC (Australia). School of Physics and Astronomy
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Report Number(s):
COEPP-MN-17-4; FERMILAB-PUB-17-202-PPD-T; MCNET-17-09; arXiv:1706.06218
Journal ID: ISSN 1434-6044; 1606091
Grant/Contract Number:
AC02-07CH11359
Type:
Published Article
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 77; Journal Issue: 9; Journal ID: ISSN 1434-6044
Publisher:
Springer
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1389662
Alternate Identifier(s):
OSTI ID: 1390782

Fischer, Nadine, and Prestel, Stefan. Combining states without scale hierarchies with ordered parton showers. United States: N. p., Web. doi:10.1140/epjc/s10052-017-5160-7.
Fischer, Nadine, & Prestel, Stefan. Combining states without scale hierarchies with ordered parton showers. United States. doi:10.1140/epjc/s10052-017-5160-7.
Fischer, Nadine, and Prestel, Stefan. 2017. "Combining states without scale hierarchies with ordered parton showers". United States. doi:10.1140/epjc/s10052-017-5160-7.
@article{osti_1389662,
title = {Combining states without scale hierarchies with ordered parton showers},
author = {Fischer, Nadine and Prestel, Stefan},
abstractNote = {Here, we present a parameter-free scheme to combine fixed-order multi-jet results with parton-shower evolution. The scheme produces jet cross sections with leading-order accuracy in the complete phase space of multiple emissions, resumming large logarithms when appropriate, while not arbitrarily enforcing ordering on momentum configurations beyond the reach of the parton-shower evolution equation. This then requires the development of a matrix-element correction scheme for complex phase-spaces including ordering conditions as well as a systematic scale-setting procedure for unordered phase-space points. Our algorithm does not require a merging-scale parameter. We implement the new method in the Vincia framework and compare to LHC data.},
doi = {10.1140/epjc/s10052-017-5160-7},
journal = {European Physical Journal. C, Particles and Fields},
number = 9,
volume = 77,
place = {United States},
year = {2017},
month = {9}
}