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Evidence of ZZγ Production with the ATLAS Detector

et al.
Creative Commons 'BY' version 4.0 license
Abstract

This Letter presents the first evidence of the simultaneous production of two bosons and one photon with the ATLAS detector at the Large Hadron Collider. The measurement is performed using the full Run-2 dataset, recorded from 2015 to 2018, of proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of . The fully leptonic final state with four leptons and one photon is analyzed, with or . This final state is measured in a fiducial region where photon final-state radiation is minimized, and the photon has a transverse momentum of . Eight events are selected, with a background estimate of . This results in an observed (expected) significance of the final state of ( ). The measured cross section for in the fiducial region is , in agreement with the standard model prediction of .

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