Observation of Electroweak Production of a Same-Sign W Boson Pair in Association with Two Jets in pp Collisions at s =13 TeV with the ATLAS Detector

M Aaboud, Torsten Åkesson, Simona Bocchetta, Eric Corrigan, Caterina Doglioni, Kristian Gregersen, Eva Brottmann Hansen, Vincent Hedberg, Göran Jarlskog, Charles Kalderon, Edgar Kellermann, Balazs Konya, Else Lytken, Katja Mankinen, Ulf Mjörnmark, Geoffrey Mullier, Ruth Pöttgen, Trine Poulsen, Oxana Smirnova, L ZwalinskiATLAS Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract

This Letter presents the observation and measurement of electroweak production of a same-sign W boson pair in association with two jets using 36.1 fb-1 of proton-proton collision data recorded at a center-of-mass energy of s=13 TeV by the ATLAS detector at the Large Hadron Collider. The analysis is performed in the detector fiducial phase-space region, defined by the presence of two same-sign leptons, electron or muon, and at least two jets with a large invariant mass and rapidity difference. A total of 122 candidate events are observed for a background expectation of 69±7 events, corresponding to an observed signal significance of 6.5 standard deviations. The measured fiducial signal cross section is σfid=2.89-0.48+0.51(stat)-0.28+0.29(syst) fb. © 2019 authors.
Original languageEnglish
Article number161801
JournalPhysical Review Letters
Volume123
Issue number16
DOIs
Publication statusPublished - 2019

Subject classification (UKÄ)

  • Subatomic Physics

Free keywords

  • Phase space methods
  • Tellurium compounds
  • ATLAS detectors
  • Invariant mass
  • Large Hadron Collider
  • Observation and measurement
  • Phase space regions
  • Proton proton collisions
  • Signal significance
  • Standard deviation
  • Bosons

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