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Precise predictions for same-sign W-boson scattering at the LHC

Ballestrero, Alessandro ; Biedermann, Benedikt ; Brass, Simon ; Denner, Ansgar ; Dittmaier, Stefan ; Frederix, Rikkert LU orcid ; Govoni, Pietro ; Grossi, Michele ; Jäger, Barbara and Karlberg, Alexander , et al. (2018) In European Physical Journal C 78(8).
Abstract

Vector-boson scattering processes are of great importance for the current run-II and future runs of the Large Hadron Collider. The presence of triple and quartic gauge couplings in the process gives access to the gauge sector of the Standard Model (SM) and possible new-physics contributions there. To test any new-physics hypothesis, sound knowledge of the SM contributions is necessary, with a precision which at least matches the experimental uncertainties of existing and forthcoming measurements. In this article we present a detailed study of the vector-boson scattering process with two positively-charged leptons and missing transverse momentum in the final state. In particular, we first carry out a systematic comparison of the various... (More)

Vector-boson scattering processes are of great importance for the current run-II and future runs of the Large Hadron Collider. The presence of triple and quartic gauge couplings in the process gives access to the gauge sector of the Standard Model (SM) and possible new-physics contributions there. To test any new-physics hypothesis, sound knowledge of the SM contributions is necessary, with a precision which at least matches the experimental uncertainties of existing and forthcoming measurements. In this article we present a detailed study of the vector-boson scattering process with two positively-charged leptons and missing transverse momentum in the final state. In particular, we first carry out a systematic comparison of the various approximations that are usually performed for this kind of process against the complete calculation, at LO and NLO QCD accuracy. Such a study is performed both in the usual fiducial region used by experimental collaborations and in a more inclusive phase space, where the differences among the various approximations lead to more sizeable effects. Afterwards, we turn to predictions matched to parton showers, at LO and NLO: we show that on the one hand, the inclusion of NLO QCD corrections leads to more stable predictions, but on the other hand the details of the matching and of the parton-shower programs cause differences which are considerably larger than those observed at fixed order, even in the experimental fiducial region. We conclude with recommendations for experimental studies of vector-boson scattering processes.

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publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C
volume
78
issue
8
article number
671
publisher
Springer
external identifiers
  • scopus:85052225524
ISSN
1434-6044
DOI
10.1140/epjc/s10052-018-6136-y
language
English
LU publication?
no
id
4cf91f01-fcb7-41fa-977e-ac5ad31a1ee0
date added to LUP
2019-05-28 15:56:27
date last changed
2023-12-03 12:54:40
@article{4cf91f01-fcb7-41fa-977e-ac5ad31a1ee0,
  abstract     = {{<p>Vector-boson scattering processes are of great importance for the current run-II and future runs of the Large Hadron Collider. The presence of triple and quartic gauge couplings in the process gives access to the gauge sector of the Standard Model (SM) and possible new-physics contributions there. To test any new-physics hypothesis, sound knowledge of the SM contributions is necessary, with a precision which at least matches the experimental uncertainties of existing and forthcoming measurements. In this article we present a detailed study of the vector-boson scattering process with two positively-charged leptons and missing transverse momentum in the final state. In particular, we first carry out a systematic comparison of the various approximations that are usually performed for this kind of process against the complete calculation, at LO and NLO QCD accuracy. Such a study is performed both in the usual fiducial region used by experimental collaborations and in a more inclusive phase space, where the differences among the various approximations lead to more sizeable effects. Afterwards, we turn to predictions matched to parton showers, at LO and NLO: we show that on the one hand, the inclusion of NLO QCD corrections leads to more stable predictions, but on the other hand the details of the matching and of the parton-shower programs cause differences which are considerably larger than those observed at fixed order, even in the experimental fiducial region. We conclude with recommendations for experimental studies of vector-boson scattering processes.</p>}},
  author       = {{Ballestrero, Alessandro and Biedermann, Benedikt and Brass, Simon and Denner, Ansgar and Dittmaier, Stefan and Frederix, Rikkert and Govoni, Pietro and Grossi, Michele and Jäger, Barbara and Karlberg, Alexander and Maina, Ezio and Pellen, Mathieu and Pelliccioli, Giovanni and Plätzer, Simon and Rauch, Michael and Rebuzzi, Daniela and Reuter, Jürgen and Rothe, Vincent and Schwan, Christopher and Shao, Hua Sheng and Stienemeier, Pascal and Zanderighi, Giulia and Zaro, Marco and Zeppenfeld, Dieter}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  month        = {{08}},
  number       = {{8}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C}},
  title        = {{Precise predictions for same-sign W-boson scattering at the LHC}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-018-6136-y}},
  doi          = {{10.1140/epjc/s10052-018-6136-y}},
  volume       = {{78}},
  year         = {{2018}},
}