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10-1103-PHYSREVD-93-112002.pdf (1.16 MB)

Measurements of Z? and Z?? production in pp collisions at vs=8?TeV with the ATLAS detector

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journal contribution
posted on 2023-06-09, 01:48 authored by Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, C A Chavez Barajas, Antonella De SantoAntonella De Santo, C T Potter, Fabrizio SalvatoreFabrizio Salvatore, I Santoyo Castillo, K Suruliz, Mark SuttonMark Sutton, Iacopo Vivarelli, The ATLAS Collaboration, others
The production of Z bosons with one or two isolated high-energy photons is studied using pp collisions at s v =8??TeV . The analyses use a data sample with an integrated luminosity of 20.3??fb -1 collected by the ATLAS detector during the 2012 LHC data taking. The Z? and Z?? production cross sections are measured with leptonic (e + e - , µ + µ - , ?? ¯ ) decays of the Z boson, in extended fiducial regions defined in terms of the lepton and photon acceptance. They are then compared to cross-section predictions from the Standard Model, where the sources of the photons are radiation off initial-state quarks and radiative Z -boson decay to charged leptons, and from fragmentation of final-state quarks and gluons into photons. The yields of events with photon transverse energy E T >250??GeV from l + l - ? events and with E T >400??GeV from ?? ¯ ? events are used to search for anomalous triple gauge-boson couplings ZZ? and Z?? . The yields of events with diphoton invariant mass m ?? >200??GeV from l + l - ?? events and with m ?? >300??GeV from ?? ¯ ?? events are used to search for anomalous quartic gauge-boson couplings ZZ?? and Z??? . No deviations from Standard Model predictions are observed and limits are placed on parameters used to describe anomalous triple and quartic gauge-boson couplings.


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Physical Review D




American Physical Society





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112001 1-41

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