Observation of π‘Š 𝛾𝛾 triboson production in proton-proton collisions at βˆšπ‘  = 13 TeV with the ATLAS detector

ATLAS Publications, J.F. Allen, T.M. Carter, D. Duda, J.M. Gargan, A. Hasib, V.A. Parrish, E.A. Pender, T. Qiu, E.P. Takeva, N. Themistokleous, E.M. Villhauer, Z. Xu, E. Zaid

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Abstract / Description of output

This letter reports the observation of π‘Š (π“πœˆ)𝛾𝛾 production in proton-proton collisions. This measurement uses the full Run 2 sample of events recorded at a center-of-mass energy of βˆšπ‘  = 13 TeV by the ATLAS detector at the LHC, corresponding to an integrated luminosity of 140 fbβˆ’1. Events with a leptonically-decaying π‘Š 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 π‘Š (π‘’πœˆ)𝛾𝛾 and π‘Š (πœ‡πœˆ)𝛾𝛾 events is measured to be 𝜎f id = 13.8 Β± 1.1(stat) +2.1βˆ’2.0(syst) Β± 0.1(lumi) fb, in agreement with the Standard Model prediction.
Original languageEnglish
Article number138400
Pages (from-to)1-24
Number of pages24
JournalPhysics Letters B
Volume848
DOIs
Publication statusPublished - 1 Jan 2024

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