Events with an isolated lepton and missing transverse momentum and measurement of W production at HERA

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Devenish ,J Braciník ,П Мурін ,M Pandurović ,A.s Proskuryakov ,A I Robertson ,B Antunović ,D Kollár ,K Černý ,Bogdan Povh ,Zainol Abidin Ibrahim ,Krzysztof Kutak ,А Антонов ,B.o Zhautykov ,D Fischer ,H.‐C Schultz‐Coulon ,K Long ,I Božović-Jelisavc̆ić ,L Stančo ,S Boutle ,M Jiménez ,B.y Oh ,K Krueger ,D Šálek ,M.c.k Mattingly ,R López-Fernández ,S M Piec ,S V Rusakov ,Ya Golubkov ,Martin Brinkmann ,N Raičević ,P Ermolov ,Th D Papadopoulou ,E Pérez ,А Спиридонов ,D.s Zotkin ,Wolfram Dietrich Zeuner ,S S Fang ,Inderpal Singh ,Jenny List ,Ning Ye ,N Vlasov ,T Naumann ,V Černý ,Zhiqing Philippe Zhang ,T Sýkora ,H.‐P Jakob ,E Wusch ,Wan Ahmad Tajuddin Wan Abdullah ,P Bussey ,E.g Boos ,I A Sorokin ,P Pluciński ,L.m Shcheglova ,J J Chwastowski ,I Pićurić ,I M Gregor ,A Meyer ,I Smiljanić ,I Katkov ,Peter Thompson ,C Wissing ,Michal Deák ,H U Martyn ,S Backović ,Y.d Ri ,A Tapper ,J Zálešâk ,Timothy W Jones ,І Каденко ,Y Onishchuk ,A G Yagunes-Molina

doi:10.1007/jhep03(2010)035

Abstract

A search for events containing an isolated electron or muon and missing transverse momentum produced in ep collisions is performed with the H1 and ZEUS detectors at HERA. The data were taken in the period 1994-2007 and correspond to an integrated luminosity of 0.98 fb^-1. The observed event yields are in good overall agreement with the Standard Model prediction, which is dominated by single W production. In the e+p data, at large hadronic transverse momentum PtX >25 GeV, a total of 23 events are observed compared to a prediction of 14.0 \pm 1.9. The total single W boson production cross section is measured as 1.06 \pm 0.16 (stat.) \pm 0.07 (sys) pb, in agreement with an SM expectation of 1.26 \pm 0.19 pb.

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