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Limits on Anomalous Trilinear Gauge Couplings in Events from pp Collisions at s√=1.96  TeV

CollaborationWith : Clark, Allan Geoffrey / Garcia Navarro, Jose Enrique / Lister, Alison / Wu, Xin
Published in Physical Review Letters. 2011, vol. 107, no. 05, p. 051802
Abstract Using Zγ candidate events collected by the CDF detector at the Tevatron Collider, we search for potential anomalous (non-standard-model) couplings between the Z boson and the photon. Zγ couplings vanish at tree level and are heavily suppressed at higher orders; hence any evidence of couplings indicates new physics. Measurements are performed using data corresponding to an integrated luminosity of 4.9  fb−1 in the Z→νν decay channel and 5.1  fb−1 in the Z→l+l− (l=μ, e) decay channels. The combination of these measurements provides the most stringent limits to date on Zγ trilinear gauge couplings. Using an energy scale of Λ=1.5  TeV to allow for a direct comparison with previous measurements, we find limits on the CP-conserving parameters that describe Zγ couplings to be |hγ,Z3|<0.022 and |hγ,Z4|<0.0009. These results are consistent with standard model predictions.
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CDF COLLABORATION. Limits on Anomalous Trilinear Gauge Couplings in Events from pp Collisions at s√=1.96  TeV. In: Physical Review Letters, 2011, vol. 107, n° 05, p. 051802. https://archive-ouverte.unige.ch/unige:38686

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Deposited on : 2014-07-15

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