Test of the Standard Model of Electroweak Interactions by Measuring the Anomalous WW Photon Couplings at 1.8 Tev
Abstract
An analysis of Wgamma events found in 73.0 pb^{-1} collected with the DO detector during Tevatron Run 1b is presented. Forty-six candidate events are observed with a predicted background of 13.2 events. The total cross section for p| pto Wgamma+X (for p_sp{T}{gamma }>10 rm GeV/c and Delta R_{egamma}>0.7) times the branching ratio of W bosons to electrons is measured to be:sigma(p| p{to }Wgamma{+}X){times} {rm BR}(W{to}enu) {=}11.19_sp{-2.32}{+2.66 }{+/-}0.61 (syst){+/- }0.56 (lum) pb95% confidence level limits on the CP-conserving anomalous coupling parameters are set using a fit to the photon transverse energy spectrum of the events with a three-body transverse cluster mass greater than 90 GeV/c^2. The results are:{-}1.4<Deltakappa<1.4 (lambda=0) rm and { -}0.5 <lambda <0.5 (Deltakappa=0) with similar limits are set on the CP-violating coupling parameters ~kappa and ~lambda. These limits were set by assuming a dipole form factor with a scale factor of Lambda=1.5 TeV. These results are combined with the previous DO Wgamma results to set limits on the coupling parameters of{-}1.2< (Deltakappa,~kappa)<1.2 rm and {-}0.4<(lambda,~ lambda)<0.4when all other couplings are restricted to their Standard Model values. No deviation from the predicted Standard Model WWgamma interaction is observed.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1996
- Bibcode:
- 1996PhDT........28K
- Keywords:
-
- ANOMALOUS COUPLINGS;
- W BOSON;
- PHOTON;
- Physics: Elementary Particles and High Energy