W production and the search for events with an isolated high-energy lepton and missing transverse momentum at HERA.
A search for the leptonic decays of W bosons produced in the reaction e{sup +}p to e{sup +}W{sup +}or{sup -}X at a centre-of-mass energy of 300 GeV has been performed with the ZEUS detector at HERA using an integrated luminosity of 47.7 pb{sup -1}. Three events consistent with W to e nu decay are found, giving a cross section estimate of 0.9{sub -0.7}{sup +}1.0{sup +}or -0.2 pb, in good agreement with the standard model prediction. The corresponding 95% C.L. upper limit on the cross section is 3.3 pb. A search for the decay W to mu nu has a smaller selection efficiency and yields no candidate events. Limits on the cross section for W production with large hadronic transverse momentum have been obtained. A search for high-transverse-momentum isolated tracks in events with large missing transverse momentum yields results in good agreement with standard model expectations, in contrast to a recent report by the H1 collaboration of the observation of an excess of such events.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 942867
- Report Number(s):
- ANL-HEP-PR-00-25; PYLBAJ; TRN: US0904487
- Journal Information:
- Phys. Lett., Vol. B471, Issue 2000; ISSN 0370-2693
- Country of Publication:
- United States
- Language:
- ENGLISH
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