Observation of Wγγ triboson production in proton-proton collisions at s√=13 TeV with the ATLAS detector

ATLAS Collaboration; Paul Newman

doi:10.1016/j.physletb.2023.138400

Observation of Wγγ triboson production in proton-proton collisions at s√=13 TeV with the ATLAS detector

ATLAS Collaboration, Paul Newman

Physics and Astronomy

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Abstract

This letter reports the observation of W(ℓν)γγ production in proton-proton collisions. This measurement uses the full Run 2 sample of events recorded at a center of mass energy of s√=13 TeV by the ATLAS detector at the LHC, corresponding to an integrated luminosity of 140 fb−1. Events with a leptonically-decaying W boson and at least two photons are considered. The background-only hypothesis is rejected with an observed and expected significance of 5.6 standard deviations, corresponding to the observation of this process. The inclusive fiducial production cross section of W(eν)γγ and W(μν)γγ events is measured to be σfid=12.2±1.0(stat)+1.9−1.8(syst)±0.1(lumi) fb, in agreement with the Standard Model prediction.

Original language	English
Article number	138400
Journal	Physics Letters B
Early online date	14 Dec 2023
DOIs	https://doi.org/10.1016/j.physletb.2023.138400
Publication status	E-pub ahead of print - 14 Dec 2023

Bibliographical note

36 pages in total, author list starting page 19, 3 figures, 2 tables, submitted to PLB. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2018-33/

Keywords

hep-ex

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title = "Observation of Wγγ triboson production in proton-proton collisions at s√=13 TeV with the ATLAS detector",

abstract = " This letter reports the observation of W(ℓν)γγ production in proton-proton collisions. This measurement uses the full Run 2 sample of events recorded at a center of mass energy of s√=13 TeV by the ATLAS detector at the LHC, corresponding to an integrated luminosity of 140 fb−1. Events with a leptonically-decaying W boson and at least two photons are considered. The background-only hypothesis is rejected with an observed and expected significance of 5.6 standard deviations, corresponding to the observation of this process. The inclusive fiducial production cross section of W(eν)γγ and W(μν)γγ events is measured to be σfid=12.2±1.0(stat)+1.9−1.8(syst)±0.1(lumi) fb, in agreement with the Standard Model prediction.",

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author = "{ATLAS Collaboration} and Paul Newman",

note = "36 pages in total, author list starting page 19, 3 figures, 2 tables, submitted to PLB. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2018-33/",

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T1 - Observation of Wγγ triboson production in proton-proton collisions at s√=13 TeV with the ATLAS detector

AU - ATLAS Collaboration

AU - Newman, Paul

N1 - 36 pages in total, author list starting page 19, 3 figures, 2 tables, submitted to PLB. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2018-33/

PY - 2023/12/14

Y1 - 2023/12/14

N2 - This letter reports the observation of W(ℓν)γγ production in proton-proton collisions. This measurement uses the full Run 2 sample of events recorded at a center of mass energy of s√=13 TeV by the ATLAS detector at the LHC, corresponding to an integrated luminosity of 140 fb−1. Events with a leptonically-decaying W boson and at least two photons are considered. The background-only hypothesis is rejected with an observed and expected significance of 5.6 standard deviations, corresponding to the observation of this process. The inclusive fiducial production cross section of W(eν)γγ and W(μν)γγ events is measured to be σfid=12.2±1.0(stat)+1.9−1.8(syst)±0.1(lumi) fb, in agreement with the Standard Model prediction.

AB - This letter reports the observation of W(ℓν)γγ production in proton-proton collisions. This measurement uses the full Run 2 sample of events recorded at a center of mass energy of s√=13 TeV by the ATLAS detector at the LHC, corresponding to an integrated luminosity of 140 fb−1. Events with a leptonically-decaying W boson and at least two photons are considered. The background-only hypothesis is rejected with an observed and expected significance of 5.6 standard deviations, corresponding to the observation of this process. The inclusive fiducial production cross section of W(eν)γγ and W(μν)γγ events is measured to be σfid=12.2±1.0(stat)+1.9−1.8(syst)±0.1(lumi) fb, in agreement with the Standard Model prediction.

KW - hep-ex

U2 - 10.1016/j.physletb.2023.138400

DO - 10.1016/j.physletb.2023.138400

M3 - Article

SN - 0370-2693

JO - Physics Letters B

JF - Physics Letters B

M1 - 138400

ER -

Observation of Wγγ triboson production in proton-proton collisions at s√=13 TeV with the ATLAS detector

Abstract

Bibliographical note

Keywords

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