Observation of $W\gamma\gamma$ triboson production in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector - INSPIRE

Observation of $W\gamma\gamma$ triboson production in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

ATLAS

Collaboration

Aug 6, 2023

24 pages

Published in:

Phys.Lett.B 848 (2024) 138400

Published: Dec 14, 2023

e-Print:

2308.03041 [hep-ex]

DOI:

10.1016/j.physletb.2023.138400 (publication)

Report number:

CERN-EP-2023-037

Experiments:

CERN-LHC-ATLAS

View in:

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Abstract: (Elsevier B.V.)

This letter reports the observation of

W (ℓ ν) γ γ

production in proton-proton collisions. This measurement uses the full Run 2 sample of events recorded at a center-of-mass energy of

\sqrt{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. The inclusive fiducial production cross section of

W (e ν) γ γ

and

W (μ ν) γ γ

events is measured to be

σ_{fid} = 13.8 \pm 1.1 (stat) \begin{matrix} + 2.1 \\ - 2.0 \end{matrix} (syst) \pm 0.1 (lumi)

fb, in agreement with the Standard Model prediction.

Note:

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

p p: scattering
p p: colliding beams
vector boson: multiple production
W: associated production
photon: pair production
W: leptonic decay
electron
muon
ATLAS
CERN LHC Coll

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