W production and the search for events with an isolated high-energy lepton and missing transverse momentum at HERA

David Bailey, J. Breitweg, S. Chekanov, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, A. Pellegrino, J. Repond, R. Stanek, R. Yoshida, M. C K Mattingly, G. Abbiendi, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. BruniG. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, N. Coppola, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia, A. Zichichi, C. Amelung, A. Bornheim, I. Brock, K. Coböken, Stewart Boogert

Research output: Contribution to journalArticlepeer-review

Abstract

A search for the leptonic decays of W bosons produced in the reaction e+p→e+W(±)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-1. Three events consistent with W → ev decay are found, giving a cross section estimate of 0.9-0.7/+1.0 ± 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 → μυ 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. (C) 2000 Published by Elsevier Science B.V.
Original languageEnglish
Pages (from-to)411-428
Number of pages17
JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume471
Issue number4
DOIs
Publication statusPublished - 6 Jan 2000

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