Isolated electrons and muons in events with missing transverse momentum at HERA

Research output: Contribution to journalArticle


title = "Isolated electrons and muons in events with missing transverse momentum at HERA",
abstract = "A search for events with a high-energy isolated electron or muon and missing transverse momentum has been performed at the electron-proton collider HERA using an integrated luminosity of 13.6 pb(-1) in e(-) p scattering and 104.7 pb(-1) in e(+) p scattering. Within the Standard Model such events are expected to be mainly due to W boson production with subsequent leptonic decay. In e(-) p interactions one event is observed in the electron channel and none in the muon channel, consistent with the expectation of the Standard Model. In the e(+) p data a total of 18 events are seen in the electron and muon channels compared to an expectation of 12.4 +/- 1.7 dominated by W production (9.4 +/- 1.6). Whilst the overall observed number of events is broadly in agreement with the number predicted by the Standard Model, there is-an excess of events with transverse momentum of the hadronic system greater than 25 GeV with 10 events found compared to 2.9 +/- 0.5 expected. The results are used to determine the cross-section for events with an isolated electron or muon and missing transverse momentum. (C) 2003 Published by Elsevier Science B.V.",
author = "V Andreev and B Andrieu and T Anthonis and A Astvatsatourov and A Babaev and J Bahr and P Baranov and E Barrelet and W Bartel and S Baumgartner and J Becker and M Beckingham and A Beglarian and O Behnke and A Belousov and C Berger and T Berndt and JC Bizot and J Bohme and V Boudry and J Bracinik and W Braunschweig and V Brisson and HB Broker and DP Brown and D Bruncko and FW Busser and A Bunyatyan and A Burrage and G Buschhorn and L Bystritskaya and AJ Campbell and S Caron and F Cassol-Brunner and V Chekelian and D Clarke and C Collard and JG Contreras and YR Coppens and JA Coughlan and MC Cousinou and BE Cox and G Cozzika and J Cvach and JB Dainton and WD Dau and K Daum and Mattias Davidsson and B Delcourt and N Delerue and R Demirchyan and {De Roeck}, A and {De Wolf}, EA and C Diaconu and J Dingfelder and P Dixon and V Dodonov and JD Dowell and A Dubak and C Duprel and G Eckerlin and D Eckstein and V Efremenko and S Egli and R Eichler and F Eisele and M Ellerbrock and E Elsen and M Erdmann and W Erdmann and PJW Faulkner and L Favart and A Fedotov and R Felst and J Ferencei and S Ferron and M Fleischer and P Fleischmann and YH Fleming and G Flucke and G Flugge and A Fomenko and I Foresti and J Formanek and G Franke and G Frising and E Gabathuler and K Gabathuler and J Garvey and J Gassner and J Gayler and R Gerhards and C Gerlich and S Ghazaryan and L Goerlich and N Gogitidze and S Gorbounov and C Grab and V Grabski and H Grassler and T Greenshaw and G Grindhammer and D Haidt and L Hajduk and J Haller and B Heinemann and G Heinzelmann and RCW Henderson and H Henschel and O Henshaw and R Heremans and G Herrera and I Herynek and M Hildebrandt and M Hilgers and KH Hiller and J Hladky and P Hoting and D Hoffmann and R Horisberger and A Hovhannisyan and M Ibbotson and C Issever and M Jacquet and M Jaffre and L Janauschek and X Janssen and V Jemanov and Leif J{\"o}nsson and C Johnson and DP Johnson and MAS Jones and Hannes Jung and D Kant and M Kapichine and Martin Karlsson and O Karschnick and J Katzy and F Keil and N Keller and J Kennedy and IR Kenyon and C Kiesling and P Kjellberg and M Klein and C Kleinwort and T Kluge and G Knies and B Koblitz and SD Kolya and V Korbel and P Kostka and R Koutouev and A Koutov and J Kroseberg and K Kruger and J Kueckens and T Kuhr and MPJ Landon and W Lange and T Lastovicka and P Laycock and A Lebedev and B Leissner and R Lemrani and V Lendermann and S Levonian and B List and E Lobodzinska and B Lobodzinski and N Loktionova and V Lubimov and S Luders and D Luke and L Lytkin and N Malden and E Malinovski and S Mangano and P Marage and J Marks and R Marshall and HU Martyn and J Martyniak and SJ Maxfield and D Meer and A Mehta and K Meier and AB Meyer and H Meyer and J Meyer and S Michine and S Mikocki and D Milstead and S Mohrdieck and MN Mondragon and F Moreau and A Morozov and JV Morris and K Muller and P Murin and V Nagovizin and B Naroska and J Naumann and T Naumann and PR Newman and F Niebergall and C Niebuhr and G Nowak and M Nozicka and B Olivier and JE Olsson and D Ozerov and V Panassik and C Pascaud and GD Patel and M Peez and E Perez and A Petrukhin and JP Phillips and D Pitzl and R Poschl and I Potachnikova and B Povh and J Rauschenberger and P Reimer and B Reisert and C Risler and E Rizvi and P Robmann and R Roosen and A Rostovtsev and S Rusakov and K Rybicki and DPC Sankey and E Sauvan and S Schatzel and J Scheins and FP Schilling and P Schleper and D Schmidt and D Schmidt and S Schmidt and S Schmitt and M Schneider and L Schoeffel and A Schoning and T Schorner-Sadenius and V Schroder and HC Schultz-Coulon and C Schwanenberger and K Sedlak and F Sefkow and I Sheviakov and LN Shtarkov and Y Sirois and T Sloan and P Smirnov and Y Soloviev and D South and V Spaskov and A Specka and H Spitzer and R Stamen and B Stella and J Stiewe and I Strauch and U Straumann and S Tchetchelnitski and G Thompson and PD Thompson and F Tomasz and D Traynor and P Truol and G Tsipolitis and I Tsurin and J Turnau and JE Turney and E Tzamariudaki and A Uraev and M Urban and A Usik and S Valkar and A Valkarova and C Vallee and {Van Mechelen}, P and AV Trevino and S Vassiliev and Y Vazdik and C Veelken and A Vest and A Vichnevski and V Volchinski and K Wacker and J Wagner and R Wallny and B Waugh and G Weber and R Weber and D Wegener and C Werner and N Werner and M Wessels and B Wessling and M Winde and GG Winter and C Wissing and EE Woehrling and E Wunsch and AC Wyatt and J Zacek and J Zalesak and Z Zhang and A Zhokin and F Zomer and {zur Nedden}, M",
year = "2003",
doi = "10.1016/S0370-2693(03)00497-0",
language = "English",
volume = "561",
pages = "241--257",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "Elsevier",
number = "3-4",