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Photo of Rikkert Frederix

Rikkert Frederix

Senior lecturer

Photo of Rikkert Frederix

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

Author

  • Alessandro Ballestrero
  • Benedikt Biedermann
  • Simon Brass
  • Ansgar Denner
  • Stefan Dittmaier
  • Rikkert Frederix
  • Pietro Govoni
  • Michele Grossi
  • Barbara Jäger
  • Alexander Karlberg
  • Ezio Maina
  • Mathieu Pellen
  • Giovanni Pelliccioli
  • Simon Plätzer
  • Michael Rauch
  • Daniela Rebuzzi
  • Jürgen Reuter
  • Vincent Rothe
  • Christopher Schwan
  • Hua Sheng Shao
  • Pascal Stienemeier
  • Giulia Zanderighi
  • Marco Zaro
  • Dieter Zeppenfeld

Summary, in English

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.

Publishing year

2018-08-01

Language

English

Publication/Series

European Physical Journal C

Volume

78

Issue

8

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1434-6044