745 research outputs found
W production and the search for events with an isolated high-energy lepton and missing transverse momentum at HERA
No full text
W production and the search for events with an isolated high-energy lepton and missing transverse momentum at HERA
Get PDFA search for the leptonic decays of W bosons produced in the reaction e/sup +/p to e/sup +/W/sup +or-/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/+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
Events with an isolated lepton and missing transverse momentum and measurement of W production at HERA
Get PDFEvents with high energy isolated electrons, muons or tau leptons and missing transverse momentum are studied using the full e ± p data sample collected by the H1 experiment at HERA, corresponding to an integrated luminosity of 474 pb -1. Within the Standard Model, events with isolated leptons and missing transverse momentum mainly originate from the production of single W bosons. The total single W boson production cross section is measured as 1.14±0.25 (stat.)±0.14 (sys.) pb, in agreement with the Standard Model expectation. The data are also used to establish limits on the WW γ gauge couplings and for a measurement of the W boson polarisation
- …
