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Search for events with an isolated lepton and missing transverse momentum and a measurement of W production at HERA

I first proposed the study of W and Z^0 production at HERA and supported its development in all aspects; this paper is the culmination of that study including my supervision of postdocs and students. For this paper, our postdoc J.Ferrando (formerly my student working in the same area) was the lead physicist for the ZEUS analysis and a lead author for this paper; my contribution included guidance via weekly discussions. To properly handle the higher statistics, systematic uncertainties of the theoretical prediction were studied: I contributed to estimations of the significance of neglected higher order corrections and QCD effects.