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 typi+cal 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-1 in the Z -> nu nu-bar decay channel and 5.1 fb-1 in
the Z --> ell+ ell- (ell ÿu, 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
ñ.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 |hgamma,Z_3| < 0.017 and |hgamma,Z_4| < 0.0006.
These results are consistent with standard model predictions.
Return to top of page.
Go to Physics Results
Updated: Friday, 2011 July 29 16:15:52 CDT automatically from input from "Carol Picciolo"