Observation of photon-induced W+ W- production in pp collisions at root s=13 TeV using the ATLAS detector

Research output: Contribution to journalArticlepeer-review

  • External authors:
  • Agni Bethani
  • Brian Cox
  • Cinzia Da Via
  • Nicholas Dann
  • Alessandra Forti
  • Jiri Masik
  • Stephen Menary
  • Joleen Pater
  • Darren Price
  • Yang Qin
  • Savanna Shaw
  • Stephen Watts
  • Terence Wyatt
  • Savannah Clawson
  • The ATLAS Collaboration

Abstract

This letter reports the observation of photon-induced production of W-boson pairs, γγ→WW. The analysis uses 139 fb −1 of LHC proton–proton collision data taken at s=13 TeV recorded by the ATLAS experiment during the years 2015–2018. The measurement is performed selecting one electron and one muon, corresponding to the decay of the diboson system as WW→e ±νμ ν final state. The background-only hypothesis is rejected with a significance of well above 5 standard deviations consistent with the expectation from Monte Carlo simulation. A cross section for the γγ→WW process of 3.13±0.31(stat.)±0.28(syst.) fb is measured in a fiducial volume close to the acceptance of the detector, by requiring an electron and a muon of opposite signs with large dilepton transverse momentum and exactly zero additional charged particles. This is found to be in agreement with the Standard Model prediction.

Bibliographical metadata

Original languageEnglish
Article number136190
JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume816
Early online date10 Mar 2021
DOIs
Publication statusPublished - 10 May 2021