Investigation of Trilinear Vector Boson Couplings Through W Boson Pair Production in Dilepton Decay Channels
- Univ. of California, Davis, CA (United States)
An investigation of the interactions between the $$W$$ boson and the $$Z$$ boson and photon through the pair production of bosons is presented. This has been accomplished via a study of the reaction $$p\overline{p} \to \ell\overline{\nu}_{\ell}$$ $$\overline{\ell^1}\nu_{\ell^1}$$ + X ($$\ell, \ell^1 = e, \mu$$) at $$\sqrt{s}$$ + 1.8 TeV, using the D0 detector at Fermilab. In a data sample corresponding to an integrated luminosity of 82 $$pb^{-1}$$ , four candidate events were observed with an expected background of 2.5 $$\pm$$ 0.4 events, which is consistent with the Standard Model prediction of 1.5 $$\pm$$ 0.1 signal events. This results in a 95% confidence level upper limit on the $$W$$pair production cross section at $$\sqrt{s}$$ = 1.8 TeV of 44.1 pb. Limits on anomalous $WWZ$ and $$WW\gamma$$ couplings are obtained for equal and HISZ coupling relations using both the total cross section and a maximum likelihood fit to the lepton transverse momentum distribution. Assuming a form factor scale of 1.5 TeV, the lepton fit yields 95% CL limits of 0.68 < $$\Delta\kappa$$ < 0.83 ($$\lambda$$ = 0) and 0.57 < $$\lambda$$ < 0.62 ($$\Delta\kappa$$= 0) for equal couplings, and 1.02 < $$\Delta\kappa_{\gamma}$$ < 1.30 ($$\lambda_{\gamma}$$ = 0) and 0.60 < $$\lambda_{\gamma}$$ < 0.62 ($$\Delta\kappa_{\gamma}$$ = 0) for HISZ coupling relations.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1369281
- Report Number(s):
- FERMILAB-THESIS-1998-67; D0-NOTE-3456; 945820
- Country of Publication:
- United States
- Language:
- English
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