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Merging NLO Multi-jet Calculations with Improved Unitarization

Bellm, Johannes LU ; Gieseke, Stefan and Plaetzer, Simon (2018) In European Physical Journal C 78(3).
Abstract
We present an algorithm to combine multiple matrix elements at LO and NLO with a parton shower. We build on the unitarized merging paradigm. The inclusion of higher orders and multiplicities reduce the scale uncertainties for observables sensitive to hard emissions, while preserving the features of inclusive quantities. The combination allows further soft and collinear emissions to be predicted by the all-order parton-shower approximation. We inspect the impact of terms that are formally but not parametrically negligible. We present results for a number of collider observables where multiple jets are observed, either on their own or in the presence of additional uncoloured particles. The algorithm is implemented in the event generator... (More)
We present an algorithm to combine multiple matrix elements at LO and NLO with a parton shower. We build on the unitarized merging paradigm. The inclusion of higher orders and multiplicities reduce the scale uncertainties for observables sensitive to hard emissions, while preserving the features of inclusive quantities. The combination allows further soft and collinear emissions to be predicted by the all-order parton-shower approximation. We inspect the impact of terms that are formally but not parametrically negligible. We present results for a number of collider observables where multiple jets are observed, either on their own or in the presence of additional uncoloured particles. The algorithm is implemented in the event generator Herwig. (Less)
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author
; and
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C
volume
78
issue
3
article number
244
publisher
Springer
external identifiers
  • scopus:85044184460
ISSN
1434-6044
DOI
10.1140/epjc/s10052-018-5723-2
language
English
LU publication?
no
id
fd7a8a29-3240-4401-a3b9-3e44f51024f3
date added to LUP
2019-05-30 15:26:38
date last changed
2022-04-02 18:14:28
@article{fd7a8a29-3240-4401-a3b9-3e44f51024f3,
  abstract     = {{We present an algorithm to combine multiple matrix elements at LO and NLO with a parton shower. We build on the unitarized merging paradigm. The inclusion of higher orders and multiplicities reduce the scale uncertainties for observables sensitive to hard emissions, while preserving the features of inclusive quantities. The combination allows further soft and collinear emissions to be predicted by the all-order parton-shower approximation. We inspect the impact of terms that are formally but not parametrically negligible. We present results for a number of collider observables where multiple jets are observed, either on their own or in the presence of additional uncoloured particles. The algorithm is implemented in the event generator Herwig.}},
  author       = {{Bellm, Johannes and Gieseke, Stefan and Plaetzer, Simon}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C}},
  title        = {{Merging NLO Multi-jet Calculations with Improved Unitarization}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-018-5723-2}},
  doi          = {{10.1140/epjc/s10052-018-5723-2}},
  volume       = {{78}},
  year         = {{2018}},
}