Search for Anomalous $WW/WZ$ Forward $$e \nu jj$$ Production at D0

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1997

DOI:https://doi.org/10.2172/1421700· OSTI ID:1421700

Hernandez, Alberto Sanchez ^[1]

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1. CINVESTAV, IPN

A search for anomalous WW and WZ production in $$p\bar{p}$$ collisions at $$\sqrt{s}$$ = 1.8 TeV using the D0 detector at Fermilab is presented. With a data sample of $$p\bar{p}\to e\nu jjX$$ events corresponding to an integrated luminosity of 76.5 $$\pm$$ 4.1$$pb^{-1}$$, 399 candidate events were identified, from which, 387.1 $$\pm$$ 39.8 events were estimated to be background. No deviations from the Standard Model were seen, which predicts 16.2 $$\pm$$ 2.7 events. The 95% CL limit on the cross section $$\sigma(p\bar{p} \to W^+ W^- X$$) 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 D0 WW,$$WZ \to e \nu jj$$ published results (13.7 $$\pm$$ 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.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1421700
• Report Number(s): FERMILAB-THESIS-1997-09; 460238
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS