/ Experiment-HEP arXiv:0904.3876


Search for Single Top Quark Production at HERA


Aaron, F.D. (Bucharest U.) ; Aldaya Martin, M. (DESY) ; Alexa, C. (Bucharest, IFIN-HH) ; Alimujiang, K. (DESY) ; Andreev, V. (Lebedev Inst.) ; Antunovic, B. (DESY) ; Asmone, A. (INFN, Rome3) ; Backovic, S. (Montenegro U.) ; Baghdasaryan, A. (Yerevan Phys. Inst.) ; Barrelet, E. (Paris U., VI-VII) ; Bartel, W. (DESY) ; Begzsuren, K. (Ulan Bator, Inst. Phys. Tech.) ; Belousov, A. (Lebedev Inst.) ; Bizot, J.C. (Orsay, LAL) ; Boudry, V. (Ecole Polytechnique) ; Bozovic-Jelisavcic, I. (VINCA Inst. Nucl. Sci., Belgrade) ; Bracinik, J. (Birmingham U.) ; Brandt, G. (DESY) ; Brinkmann, M. (Hamburg U.) ; Brisson, V. (Orsay, LAL) ; Bruncko, D. (Kosice, IEF) ; Bunyatyan, A. (Yerevan Phys. Inst.) ; Buschhorn, G. (Munich, Max Planck Inst.) ; Bystritskaya, L. (Moscow, ITEP) ; Campbell, A.J. (DESY) ; Cantun Avila, K.B. (Merida, IPN) ; Cassol-Brunner, F. (Marseille, CPPM) ; Cerny, K. (Charles U.) ; Cerny, V. (Comenius U.) ; Chekelian, V. (Munich, Max Planck Inst.) ; Cholewa, A. (DESY) ; Contreras, J.G. (Merida, IPN) ; Coughlan, J.A. (Rutherford) ; Cozzika, G. (DSM, DAPNIA, Saclay) ; Cvach, J. (Prague, Inst. Phys.) ; Dainton, J.B. (Liverpool U.) ; Daum, K. (Wuppertal U.) ; Deak, M. (DESY) ; de Boer, Y. (DESY) ; Delcourt, B. (Orsay, LAL) ; Del Degan, M. (Zurich, ETH) ; Delvax, J. (Antwerp U., WISINF) ; De Roeck, A. (CERN) ; De Wolf, E.A. (Antwerp U., WISINF) ; Diaconu, C. (Marseille, CPPM) ; Dodonov, V. (Heidelberg, Max Planck Inst.) ; Dossanov, A. (Munich, Max Planck Inst.) ; Dubak, A. (Munich, Max Planck Inst.) ; Eckerlin, G. (DESY) ; Efremenko, V. (Moscow, ITEP) ; Egli, S. (PSI, Villigen) ; Eliseev, A. (Lebedev Inst.) ; Elsen, E. (DESY) ; Falkiewicz, A. (Cracow, INP) ; Favart, L. (Antwerp U., WISINF) ; Fedotov, A. (Moscow, ITEP) ; Felst, R. (DESY) ; Feltesse, J. (Hamburg U.) ; Ferencei, J. (Kosice, IEF) ; Fischer, D.-J. (DESY) ; Fleischer, M. (DESY) ; Fomenko, A. (Lebedev Inst.) ; Gabathuler, E. (Liverpool U.) ; Gayler, J. (DESY) ; Ghazaryan, Samvel (Yerevan Phys. Inst.) ; Glazov, A. (DESY) ; Glushkov, I. (DESY, Zeuthen) ; Goerlich, L. (Cracow, INP) ; Gogitidze, N. (Lebedev Inst.) ; Gouzevitch, M. (Ecole Polytechnique) ; Grab, C. (Zurich, ETH) ; Greenshaw, T. (Liverpool U.) ; Grell, B.R. (DESY) ; Grindhammer, G. (Munich, Max Planck Inst.) ; Habib, S. (World Lab, Lausanne) ; Haidt, D. (DESY) ; Helebrant, C. (DESY) ; Henderson, R.C.W. (Lancaster U.) ; Hennekemper, E. (Kirchhoff Inst. Phys.) ; Henschel, H. (DESY, Zeuthen) ; Herbst, M. (Kirchhoff Inst. Phys.) ; Herrera, G. (CINVESTAV, IPN) ; Hildebrandt, M. (PSI, Villigen) ; Hiller, K.H. (DESY, Zeuthen) ; Hoffmann, D. (Marseille, CPPM) ; Horisberger, R. (PSI, Villigen) ; Hreus, T. (Kosice U.) ; Jacquet, M. (Orsay, LAL) ; Janssen, M.E. (DESY) ; Janssen, X. (Antwerp U., WISINF) ; Jonsson, L. (Lund U.) ; Jung, Andreas Werner (Kirchhoff Inst. Phys.) ; Jung, H. (DESY) ; Kapichine, M. (Dubna, JINR) ; Katzy, J. (DESY) ; Kenyon, I.R. (Birmingham U.) ; Kiesling, C. (Munich, Max Planck Inst.) ; Klein, M. (Liverpool U.) ; Kleinwort, C. (DESY) ; Kluge, T. (Liverpool U.) ; Knutsson, A. (DESY) ; Kogler, R. (Munich, Max Planck Inst.) ; Kostka, P. (DESY, Zeuthen) ; Kraemer, M. (DESY) ; Krastev, K. (DESY) ; Kretzschmar, J. (Liverpool U.) ; Kropivnitskaya, A. (Moscow, ITEP) ; Kruger, K. (Kirchhoff Inst. Phys.) ; Kutak, K. (DESY) ; Landon, M.P.J. (Queen Mary, U. of London) ; Lange, W. (DESY, Zeuthen) ; Lastovicka-Medin, G. (Montenegro U.) ; Laycock, P. (Liverpool U.) ; Lebedev, A. (Lebedev Inst.) ; Leibenguth, G. (Zurich, ETH) ; Lendermann, V. (Kirchhoff Inst. Phys.) ; Levonian, S. (DESY) ; Li, G. (Orsay, LAL) ; Lipka, K. (Hamburg U.) ; Liptaj, A. (Munich, Max Planck Inst.) ; List, B. (Hamburg U.) ; List, J. (DESY) ; Loktionova, N. (Lebedev Inst.) ; Lopez-Fernandez, R. (CINVESTAV, IPN) ; Lubimov, V. (Moscow, ITEP) ; Lytkin, L. (Heidelberg, Max Planck Inst.) ; Makankine, A. (Dubna, JINR) ; Malinovski, E. (Lebedev Inst.) ; Marage, P. (Antwerp U., WISINF) ; Marti, Ll. (DESY) ; Martyn, H.-U. (Aachen, Tech. Hochsch.) ; Maxfield, S.J. (Liverpool U.) ; Mehta, A. (Liverpool U.) ; Meyer, A.B. (DESY) ; Meyer, H. (DESY) ; Meyer, H. (Wuppertal U., Dept. Math.) ; Meyer, J. (DESY) ; Michels, V. (DESY) ; Mikocki, S. (Cracow, INP) ; Milcewicz-Mika, I. (Cracow, INP) ; Moreau, F. (Ecole Polytechnique) ; Morozov, A. (Dubna, JINR) ; Morris, J.V. (Rutherford) ; Mozer, Matthias Ulrich (Antwerp U., WISINF) ; Mudrinic, M. (VINCA Inst. Nucl. Sci., Belgrade) ; Muller, K. (Zurich U.) ; Murin, P. (Kosice U.) ; Naumann, Th. (DESY, Zeuthen) ; Newman, P.R. (Birmingham U.) ; Niebuhr, C. (DESY) ; Nikiforov, A. (DESY) ; Nowak, G. (Cracow, INP) ; Nowak, K. (Zurich U.) ; Nozicka, M. (DESY) ; Olivier, B. (Munich, Max Planck Inst.) ; Olsson, J.E. (DESY) ; Osman, S. (Lund U.) ; Ozerov, D. (Moscow, ITEP) ; Palichik, V. (Dubna, JINR) ; Panagoulias, I. (Natl. Tech. U., Athens) ; Pandurovic, M. (VINCA Inst. Nucl. Sci., Belgrade) ; Papadopoulou, Th. (Natl. Tech. U., Athens) ; Pascaud, C. (Orsay, LAL) ; Patel, G.D. (Liverpool U.) ; Pejchal, O. (Charles U.) ; Perez, E. (CERN) ; Petrukhin, A. (Moscow, ITEP) ; Picuric, I. (Montenegro U.) ; Piec, S. (DESY, Zeuthen) ; Pitzl, D. (DESY) ; Placakyte, R. (DESY) ; Pokorny, B. (Hamburg U.) ; Polifka, R. (Charles U.) ; Povh, B. (Heidelberg, Max Planck Inst.) ; Preda, T. (Bucharest, IFIN-HH) ; Radescu, V. (DESY) ; Rahmat, A.J. (Liverpool U.) ; Raicevic, N. (Montenegro U.) ; Raspiareza, A. (Munich, Max Planck Inst.) ; Ravdandorj, T. (Ulan Bator, Inst. Phys. Tech.) ; Reimer, P. (Prague, Inst. Phys.) ; Rizvi, E. (Queen Mary, U. of London) ; Robmann, P. (Zurich U.) ; Roland, B. (Antwerp U., WISINF) ; Roosen, R. (Antwerp U., WISINF) ; Rostovtsev, A. (Moscow, ITEP) ; Rotaru, M. (Bucharest, IFIN-HH) ; Ruiz Tabasco, J.E. (Merida, IPN) ; Rurikova, Z. (DESY) ; Rusakov, S. (Lebedev Inst.) ; Salek, D. (Charles U.) ; Sankey, D.P.C. (Rutherford) ; Sauter, M. (Zurich, ETH) ; Sauvan, E. (Marseille, CPPM) ; Schmitt, S. (DESY) ; Schmitz, C. (Zurich U.) ; Schoeffel, L. (DSM, DAPNIA, Saclay) ; Schoning, A. (Zurich U.) ; Schultz-Coulon, H.-C. (Kirchhoff Inst. Phys.) ; Sefkow, F. (DESY) ; Shaw-West, R.N. (Birmingham U.) ; Shtarkov, L.N. (Lebedev Inst.) ; Shushkevich, S. (Munich, Max Planck Inst.) ; Sloan, T. (Lancaster U.) ; Smiljanic, Ivan (VINCA Inst. Nucl. Sci., Belgrade) ; Soloviev, Y. (Lebedev Inst.) ; Sopicki, P. (Cracow, INP) ; South, D. (Dortmund U.) ; Spaskov, V. (Dubna, JINR) ; Specka, Arnd E. (Ecole Polytechnique) ; Staykova, Z. (DESY) ; Steder, M. (DESY) ; Stella, B. (INFN, Rome3) ; Stoicea, G. (Bucharest, IFIN-HH) ; Straumann, U. (Zurich U.) ; Sunar, D. (Antwerp U., WISINF) ; Sykora, T. (Antwerp U., WISINF) ; Tchoulakov, V. (Dubna, JINR) ; Thompson, G. (Queen Mary, U. of London) ; Thompson, P.D. (Birmingham U.) ; Toll, T. (DESY) ; Tomasz, F. (Kosice, IEF) ; Tran, T.H. (Orsay, LAL) ; Traynor, D. (Queen Mary, U. of London) ; Trinh, T.N. (Marseille, CPPM) ; Truol, P. (Zurich U.) ; Tsakov, I. (Sofiya, Inst. Nucl. Res.) ; Tseepeldorj, B. (Mongolian Natl. U.) ; Turnau, J. (Cracow, INP) ; Urban, K. (Kirchhoff Inst. Phys.) ; Valkarova, A. (Charles U.) ; Vallee, C. (Marseille, CPPM) ; Van Mechelen, P. (Antwerp U., WISINF) ; Vargas Trevino, A. (DESY) ; Vazdik, Y. (Lebedev Inst.) ; Vinokurova, S. (DESY) ; Volchinski, V. (Yerevan Phys. Inst.) ; von den Driesch, M. (DESY) ; Wegener, D. (Dortmund U.) ; Wissing, Ch. (DESY) ; Wunsch, E. (DESY) ; Zacek, J. (Charles U.) ; Zalesak, J. (Prague, Inst. Phys.) ; Zhang, Z. (Orsay, LAL) ; Zhokin, A. (Moscow, ITEP) ; Zimmermann, T. (Zurich, ETH) ; Zohrabyan, H. (Yerevan Phys. Inst.) ; Zomer, F. (Orsay, LAL) ; Zus, R. (Bucharest, IFIN-HH)

Published in: Phys.Lett.
Year: 2009
Vol.: B678
Page No: 450-458
Pages: 22

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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