Observation of W+W–γ production in pp collisions at $$\sqrt{s}$$ = 13 TeV with the ATLAS detector and constraints on anomalous quartic gauge-boson couplings
Journal Article
·
· Physics Letters. B
This Letter reports the observation of W+W–γ triboson production in 140 fb–1 of data collected by the ATLAS detector from proton–proton collisions at a centre-of-mass energy of $$\sqrt{s}$$ = 13 TeV at the LHC. Events with an opposite-charge eμ pair, a high transverse-momentum photon, and significant missing transverse momentum are considered. The observed (expected) significance of the signal is 5.9 (6.0) standard deviations. The measured fiducial cross-section, defined for the W+W–γ → e±μ∓$$ν\bar{ν}$$γ final state is 6.2 ± 0.8 (stat.) ± 0.6 (sys.) fb, in good agreement with the Standard Model prediction of 6.1$$^{+1.0}_{–0.7}$$ fb. Constraints on the Wilson coefficients of 13 dimension-8 operators describing physics beyond the Standard Model through anomalous quartic gauge-boson couplings are derived using the effective field theory framework.
- Research Organization:
- University of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- ATLAS Collaboration
- Grant/Contract Number:
- AC02-76SF00515; FG02-03ER41244
- OSTI ID:
- 3020217
- Journal Information:
- Physics Letters. B, Journal Name: Physics Letters. B Vol. 873; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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