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Search for Single Top Quark Production at HERA

F.D. Aaron M. Aldaya Martin C. Alexa K. Alimujiang V. Andreev B. Antunovic A. Asmone S. Backovic A. Baghdasaryan E. Barrelet 1 W. Bartel K. Begzsuren A. Belousov J.C. Bizot 2 V. Boudry 3 I. Bozovic-Jelisavcic J. Bracinik G. Brandt M. Brinkmann V. Brisson 2 D. Bruncko A. Bunyatyan G. Buschhorn L. Bystritskaya A.J. Campbell K.B. Cantun Avila F. Cassol-Brunner 4 K. Cerny V. Cerny V. Chekelian A. Cholewa J.G. Contreras J.A. Coughlan G. Cozzika 5 J. Cvach J.B. Dainton K. Daum M. De'Ak Y. de Boer B. Delcourt 2 M. del Degan J. Delvax A. de Roeck E.A. de Wolf C. Diaconu 4 V. Dodonov A. Dossanov A. Dubak G. Eckerlin V. Efremenko S. Egli A. Eliseev E. Elsen A. Falkiewicz L. Favart A. Fedotov R. Felst J. Feltesse 5 J. Ferencei D.-J. Fischer M. Fleischer A. Fomenko E. Gabathuler J. Gayler S. Ghazaryan A. Glazov I. Glushkov L. Goerlich N. Gogitidze M. Gouzevitch C. Grab T. Greenshaw B.R. Grell G. Grindhammer S. Habib D. Haidt C. Helebrant R.C.W. Henderson E. Hennekemper H. Henschel M. Herbst G. Herrera M. Hildebrandt K.H. Hiller D. Hoffmann 4 R. Horisberger T. Hreus M. Jacquet 2 M.E. Janssen X. Janssen L. J¨onsson A.W. Jung H. Jung M. Kapichine J. Katzy I.R. Kenyon C. Kiesling M. Klein C. Kleinwort T. Kluge A. Knutsson R. Kogler P. Kostka M. Kraemer K. Krastev J. Kretzschmar A. Kropivnitskaya K. Kr¨uger K. Kutak M.P.J. Landon W. Lange G. Laˇstoviˇcka-Medin P. Laycock A. Lebedev G. Leibenguth V. Lendermann S. Levonian G. Li 2 K. Lipka A. Liptaj B. List J. List N. Loktionova R. Lopez-Fernandez V. Lubimov L. Lytkin A. Makankine E. Malinovski P. Marage Ll. Marti H.-U. Martyn S.J. Maxfield A. Mehta A.B. Meyer H. Meyer J. Meyer V. Michels S. Mikocki I. Milcewicz-Mika F. Moreau 3 A. Morozov J.V. Morris M.U. Mozer M. Mudrinic K. M¨uller P. Mur'In Th. Naumann P.R. Newman C. Niebuhr A. Nikiforov G. Nowak K. Nowak M. Nozicka B. Olivier J.E. Olsson S. Osman D. Ozerov V. Palichik I. Panagouliasl M. Pandurovic Th. Papadopouloul C. Pascaud 2 G.D. Patel O. Pejchal E. Perez 5 A. Petrukhin I. Picuric S. Piec D. Pitzl R. Plaˇcakyt˙e B. Pokorny R. Polifka B. Povh T. Preda V. Radescu A.J. Rahmat N. Raicevic A. Raspiareza T. Ravdandorj P. Reimer E. Rizvi P. Robmann B. Roland R. Roosen A. Rostovtsev M. Rotaru J.E. Ruiz Tabasco Z. Rurikova S. Rusakov D. ˇs'Alek D.P.C. Sankey M. Sauter E. Sauvan 4 S. Schmitt C. Schmitz L. Schoeffel 5 A. Schöning H.-C. Schultz-Coulon F. Sefkow R.N. Shaw-West L.N. Shtarkov S. Shushkevich T. Sloan I. Smiljanic Y. Soloviev P. Sopicki D. South V. Spaskov A. Specka 3 Z. Staykova M. Steder B. Stella G. Stoicea U. Straumann D. Sunar T. Sykora V. Tchoulakov G. Thompson P.D. Thompson T. Toll F. Tomasz T.H. Tran 2 D. Traynor T.N. Trinh 4 P. Truöl I. Tsakov B. Tseepeldorj J. Turnau K. Urban A. Valk'Arov'A Corentin Vallée 4 P. van Mechelen A. Vargas Trevino Y. Vazdik S. Vinokurova V. Volchinski M. von den Driesch D. Wegener Ch. Wissing E. Wünsch J. Žáček J. Zálešák Zhen Zhang 2 A. Zhokin T. Zimmermann H. Zohrabyan F. Zomer 2 R. Zus
Abstract : A search for single top quark production is performed in the full ep data sample collected by the H1 experiment at HERA, corresponding to an integrated luminosity of 474 pb^-1. Decays of top quarks into a b quark and a W boson with subsequent leptonic or hadronic decay of the W are investigated. A multivariate analysis is performed to discriminate top quark production from Standard Model background processes. An upper limit on the top quark production cross section via flavour changing neutral current processes sigma (ep -> etX) < 0.25 pb is established at 95% CL. Limits on the anomalous coupling kappa_{tu gamma} are derived.
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Submitted on : Monday, April 27, 2009 - 12:10:57 PM
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F.D. Aaron, M. Aldaya Martin, C. Alexa, K. Alimujiang, V. Andreev, et al.. Search for Single Top Quark Production at HERA. Physics Letters B, Elsevier, 2009, 678, pp.450-458. ⟨10.1016/j.physletb.2009.06.057⟩. ⟨in2p3-00378917⟩

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