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| Diboson Analyses | |||
| WW/WZ-> enujj | |||
| W(enu/munu)g | |||
| Z(ee/mu mu)g | |||
| Z(nu nu)g | |||
| Physics Groups | |||
| Electroweak | |||
| Top | |||
| B Physics | |||
| New Phenomena | |||
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Search for Anomalous WW/WZ->evjj Production at DØ
Alberto Sánchez Hernández CINVESTAV, Mexico City |
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A search for anomalous WW and WZ production in ppbar collisions at
sqrt(s)=1.8 TeV using the DØ detector at Fermilab is presented.
With a data sample of ppbar->evjjX events corresponding to an integrated
luminosity of 76.5 ± 4.1 pb¯¹, 399 candidate events were
identified, from which, 387.1 ± 39.8 events were estimated to be
background. No deviations from the Standard Model were seen, which
predicts 16.2 ± 2.7 events. The 95% CL limit on the cross section
\sigma(ppbar->W+W¯X) was calculated to be 93.8 pb. Limits on the
CP-conserving anomalous WW\gamma and WWZ coupling parameters were
obtained from a binned likelihood fit to the transverse momentum spectrum
of the W boson. Assuming that the WW\gamma and WWZ coupling parameters are
equal, the 95% CL limits on the CP-conserving couplings are
-0.56 < \Delta\kappa < 0.75 (with \lambda = 0) and -0.42 <
\lambda < 0.44 (with \Delta\kappa = 0), for a form factor scale
\Lambda_{FF} = 1.5 TeV. Limits on other assumptions are also reported. These results were combined with the previous DØ WW,WZ-> evjj published results (13.7±0.7 pb¯¹), and the limits on the anomalous coupling parameters were set to -0.44 < \Delta\kappa < 0.60 (with \lambda = 0) and -0.34 < \lambda < 0.37 (with \Delta\kappa = 0), for a form factor scale \Lambda_{FF} = 2.0 TeV. |
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Last Updated: 2/19/97
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