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Measurements of Z[gamma] and Z[gamma][gamma] production in pp collisions at [radical]s=8TeV with the ATLAS detector

Aad, G ; Abbott, B ; Abdallah, J ; Abdinov, O ; Abeloos, B ; Aben, R ; Abolins, M ; Abouzeid, Os ; Abraham, Nl ; Abramowicz, H

Physical review. D, 2016-06, Vol.93 (11) [Periódico revisado por pares]

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  • Título:
    Measurements of Z[gamma] and Z[gamma][gamma] production in pp collisions at [radical]s=8TeV with the ATLAS detector
  • Autor: Aad, G ; Abbott, B ; Abdallah, J ; Abdinov, O ; Abeloos, B ; Aben, R ; Abolins, M ; Abouzeid, Os ; Abraham, Nl ; Abramowicz, H
  • Assuntos: Bosons ; Couplings ; Decay ; Detectors ; Mathematical models ; Photons ; Quarks ; Searching
  • É parte de: Physical review. D, 2016-06, Vol.93 (11)
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    content type line 23
    ObjectType-Feature-2
  • Descrição: The production of Z bosons with one or two isolated high-energy photons is studied using pp collisions at s?=8TeV. The analyses use a data sample with an integrated luminosity of 20.3fb super(?1) collected by the ATLAS detector during the 2012 LHC data taking. The Z[gamma] and Z[gamma][gamma] production cross sections are measured with leptonic (e super(+)e super(-), [mu] super(+)[mu] super(-), [nu][nu]) 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 sub(T)>250GeV from [scriptl] super(+)[scriptl] super(-)[gamma] events and with E sub(T)>400GeV from [nu][nu][gamma] events are used to search for anomalous triple gauge-boson couplings ZZ[gamma] and Z[gamma][gamma]. The yields of events with diphoton invariant mass m[gamma][gamma]>200 GeV from [scriptl] super(+)[scriptl] super(-)[gamma][gamma] events and with m[gamma][gamma]>300 GeV from [nu][nu][gamma][gamma] events are used to search for anomalous quartic gauge-boson couplings ZZ[gamma][gamma] and Z[gamma][gamma][gamma]. No deviations from Standard Model predictions are observed and limits are placed on parameters used to describe anomalous triple and quartic gauge-boson couplings.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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