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Measurements of Z gamma and Z gamma gamma production in pp collisions at root s=8 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 2860
2016 (English)In: PHYSICAL REVIEW D, ISSN 2470-0010, Vol. 93, no 11Article in journal (Refereed) Published
Abstract [en]

The production of Z bosons with one or two isolated high-energy photons is studied using pp collisions at root s = 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 gamma and Z gamma gamma production cross sections are measured with leptonic (e(+) e(-), mu(+) mu(-), nu(nu) over bar) 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(-) gamma events and with E-T > 400 GeV from nu(nu) over bar 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 l(+) l(-) gamma gamma events and with m(gamma gamma) > 300 GeV from nu(nu) over bar 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.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 93, no 11
Keyword [en]
GAUGE-BOSON COUPLINGS; PARTON DISTRIBUTIONS; HADRON COLLIDERS; W-GAMMA; LHC; LEP; SEARCH
National Category
Physical Sciences Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-189152DOI: 10.1103/PhysRevD.93.112002ISI: 000376998900001OAI: oai:DiVA.org:kth-189152DiVA: diva2:943593
Note

QC 20160628

Available from: 2016-06-28 Created: 2016-06-28 Last updated: 2016-06-28Bibliographically approved

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Lund-Jensen, BengtSidebo, EdvinStrandberg, Jonas
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