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Combining states without scale hierarchies with ordered parton showers

Fischer, Nadine LU and Prestel, Stefan LU (2017) In European Physical Journal C 77(9).
Abstract

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 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. The resulting algorithm does not require a merging-scale parameter. We implement the new method in the Vincia framework and compare to LHC... (More)

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 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. The resulting algorithm does not require a merging-scale parameter. We implement the new method in the Vincia framework and compare to LHC data.

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author
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publishing date
type
Contribution to journal
publication status
published
in
European Physical Journal C
volume
77
issue
9
article number
601
publisher
Springer
external identifiers
  • scopus:85029605679
ISSN
1434-6044
DOI
10.1140/epjc/s10052-017-5160-7
language
English
LU publication?
no
id
85a0368a-d256-4734-bbb7-dc9bce914447
date added to LUP
2019-05-16 13:33:14
date last changed
2022-04-25 23:54:46
@article{85a0368a-d256-4734-bbb7-dc9bce914447,
  abstract     = {{<p>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 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. The resulting algorithm does not require a merging-scale parameter. We implement the new method in the Vincia framework and compare to LHC data.</p>}},
  author       = {{Fischer, Nadine and Prestel, Stefan}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{9}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C}},
  title        = {{Combining states without scale hierarchies with ordered parton showers}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-017-5160-7}},
  doi          = {{10.1140/epjc/s10052-017-5160-7}},
  volume       = {{77}},
  year         = {{2017}},
}