Observation of WZγ Production in pp Collisions at √s=13 TeV with the ATLAS Detector

AbstraktAbstract

This Letter reports the observation of production and a measurement of its cross section using of proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The production cross section, with both the and bosons decaying leptonically, (, ), is measured in a fiducial phase-space region defined such that the leptons and the photon have high transverse momentum and the photon is isolated. The cross section is found to be . The corresponding standard model predicted cross section calculated at next-to-leading order in perturbative quantum chromodynamics and at leading order in the electroweak coupling constant is 1.50±0.06 fb. The observed significance of the 𝑊⁢𝑍⁢𝛾 signal is 6.3⁢𝜎, compared with an expected significance of 5.0⁢𝜎.

This Letter reports the observation of production and a measurement of its cross section using of proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The production cross section, with both the and bosons decaying leptonically, (, ), is measured in a fiducial phase-space region defined such that the leptons and the photon have high transverse momentum and the photon is isolated. The cross section is found to be . The corresponding standard model predicted cross section calculated at next-to-leading order in perturbative quantum chromodynamics and at leading order in the electroweak coupling constant is 1.50±0.06 fb. The observed significance of the 𝑊⁢𝑍⁢𝛾 signal is 6.3⁢𝜎, compared with an expected significance of 5.0⁢𝜎.