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

Abstract : Using Zgamma 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. At the hard scatter energies typical of the Tevatron, standard model Zgamma couplings are too weak to be detected by current experiments; hence any evidence of couplings indicates new physics. Measurements are performed using data corresponding to an integrated luminosity of 4.9 /fb in the Z -> nunubar decay channel and 5.1 /fb in the Z -> l^+l^- (l=mu, e) decay channels. The combination of these measurements provides the most stringent limits to date on Zgamma trilinear gauge couplings. Using an energy scale of Lambda = 1.5 TeV to allow for a direct comparison with previous measurements, we find limits on the CP-conserving parameters that describe Zgamma couplings to be |h_3^{\gamma,Z}| < 0.017 and |h_4^{\gamma,Z}| < 0.0006. These results are consistent with standard model predictions.
Document type :
Journal articles
Domain :

http://hal.in2p3.fr/in2p3-00598730
Contributor : Swarna Bassava <>
Submitted on : Tuesday, June 7, 2011 - 2:24:18 PM
Last modification on : Monday, December 14, 2020 - 9:44:27 AM

### Citation

T. Aaltonen, B. Alvarez Gonzalezv, S. Amerio, D. Amidei, A. Anastassov, et al.. Limits on Anomalous Trilinear Gauge Couplings in Zγ Events from pp̅ Collisions at √s=1.96 TeV. Physical Review Letters, American Physical Society, 2011, 107, pp.051802. ⟨10.1103/PhysRevLett.107.051802⟩. ⟨in2p3-00598730⟩

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