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

Alessandro Ballestrero, Benedikt Biedermann, Simon Brass, Ansgar Denner (Corresponding author), 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 ShaoPascal Stienemeier, Giulia Zanderighi, Marco Zaro, Dieter Zeppenfeld

Publications: Contribution to journalArticlePeer Reviewed

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 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.

Original languageEnglish
Article number671
Number of pages25
JournalEuropean Physical Journal C
Volume78
Issue number8
DOIs
Publication statusPublished - 22 Aug 2018

Austrian Fields of Science 2012

  • 103012 High energy physics

Keywords

  • ELECTRON-POSITRON COLLISIONS
  • HIGH-ENERGY COLLIDERS
  • ONE-LOOP AMPLITUDES
  • MONTE-CARLO TOOLS
  • UNSTABLE PARTICLES
  • STANDARD INTERFACE
  • SCALAR INTEGRALS
  • GENERAL-APPROACH
  • CROSS-SECTIONS
  • FINAL-STATES

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