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Z gamma production and limits on anomalous ZZ gamma and Z gamma gamma couplings in pp collisions at root s=1.96 TeV
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2007 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 653, no 5-6, p. 378-386Article in journal (Refereed) Published
Abstract [en]

We present a study of eey and mu mu gamma events using 1109 (1009) pb-(1) of data in the electron (muon) channel, respectively. These data were collected with the DO detector at the Fermilab Tevatron pp collider at Is = 1.96 TeV. Having observed 453 (515) candidates in the eey (jtAy) final state, we measure the Z gamma production cross section for a photon with transverse energy ET > 7 GeV, separation between the photon and leptons Delta Rey > 0.7, and invariant mass of the di-lepton pair Mee > 30 GeV/(2)(c), to be 4.96 0.30(stat. + syst.) zE 0.30(lumi.) pb, in agreement with the Standard Model prediction of 4.74 0.22 pb. This is the most precise Zy cross section measurement at a hadron collider. We set limits on anomalous trilinear Zyy and ZZy gauge boson couplings of -0.085 < h(30)(y) < 0.084, -0.0053 < h(40)(y) < 0.0054 and -0.083 < h(30)(Z) < 0.082, 30 40 30 -0.0053 < h(40)(Z) < 0.0054 at the 95% C.L. for the form-factor scale A = 1.2 TeV. 40 .

Place, publisher, year, edition, pages
2007. Vol. 653, no 5-6, p. 378-386
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Physical Sciences
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URN: urn:nbn:se:uu:diva-143226DOI: 10.1016/j.physletb.2007.08.035ISI: 000250282200002OAI: oai:DiVA.org:uu-143226DiVA, id: diva2:389772
Available from: 2011-01-20 Created: 2011-01-20 Last updated: 2017-12-11Bibliographically approved

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High Energy PhysicsDepartment of Nuclear and Particle Physics
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