Search for single top quark production at HERA
F. D. AaronNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaM. Aldaya MartinC. AlexaNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaK. AlimujiangVladimir AndreevLebedev Physical Institute, Moscow, Russia 19B. AntunovićA. AsmoneDipartimento di Fisica, Università di Roma Tre and INFN Roma 3, Roma, ItalyS. BackovićFaculty of Science, University of Montenegro, Podgorica, Montenegro 19A. BaghdasaryanYerevan Physics Institute, Yerevan, ArmeniaE. BarreletSorbonne UniversitéW. BartelK. BegzsurenInstitute of Physics and TechnologyA. BelousovLebedev Physical Institute, Moscow, Russia 19J.C. BizotCentre National de la Recherche ScientifiqueV. BoudryÉcole PolytechniqueI. Božović-Jelisavc̆ićVinča Institute of Nuclear SciencesJ. BraciníkSchool of Physics and Astronomy, University of Birmingham, Birmingham, UKG. BrandtMartin BrinkmannInstitut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 11V. BrissonInstitut National de Physique Nucléaire et de Physique des ParticulesD. BrunckoInstitute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic 15A. BunyatyanYerevan Physics Institute, Yerevan, ArmeniaG. BuschhornMax-Planck-Institut für Physik, München, GermanyL. BystritskayaVinča Institute of Nuclear SciencesA. CampbellK. B. Cantun AvilaCentro de Investigación y de Estudios Avanzados del Instituto Politécnico NacionalF. Cassol-BrunnerCentre de physique des particules de MarseilleK. ČernýFaculty of Mathematics and Physics, Charles University, Praha, Czech Republic 20V. ČernýInstitute of Experimental Physics of the Slovak Academy of SciencesV. ChekelianInstitut National de Physique Nucléaire et de Physique des ParticulesA. CholewaJ.G. ContrerasDepartamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico 17J. A. CoughlanRutherford Appleton Laboratory, Chilton, Didcot, UK 12G. CozzikaCEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, FranceJ. CvachCzech Academy of Sciences, Institute of SociologyJ.B. DaintonDepartment of Physics, University of Liverpool, Liverpool, UK 12K. DaumFachbereich C, Universität Wuppertal, Wuppertal, GermanyMichal DeákY. de BoerDESY, Hamburg, GermanyB. DelcourtCentre National de la Recherche ScientifiqueM. Del DeganInstitut für Teilchenphysik, ETH, Zürich, Switzerland 21J. DelvaxInter-University Institute for High Energies ULB-VUB, Brussels, Universiteit Antwerpen, Antwerpen, Belgium 13A. De RoeckE. A. De WolfInter-University Institute for High Energies ULB-VUB, Brussels, Universiteit Antwerpen, Antwerpen, Belgium 13C. DiaconuCentre de physique des particules de MarseilleV. DodonovMax-Planck-Institut für Kernphysik, Heidelberg, GermanyA. DossanovMax-Planck-Institut für Physik, München, GermanyA. DubakMax-Planck-Institut für Physik, München, GermanyG. EckerlinV. EfremenkoLAL, Univ. Paris-Sud, CNRS/IN2P3, Orsay, FranceS. EgliPaul Scherrer Institut, Villigen, SwitzerlandA. EliseevLebedev Physical Institute, Moscow, Russia 19E. ElsenDESY, Hamburg, GermanyA. FalkiewiczInstitute for Nuclear Physics, Cracow, Poland 14L. FavartVinča Institute of Nuclear SciencesA. FedotovInstitute for Theoretical and Experimental Physics, Moscow, Russia 18R. FelstLAL, Univ. Paris-Sud, CNRS/IN2P3, Orsay, FranceJ. FeltesseAlso at DESY and University Hamburg, Helmholtz Humboldt Research Award 49 Also at Faculty of Physics, University of Bucharest, Bucharest, RomaniaJ. FerenceiInstitute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic 15D.-J. FischerM. FleischerA. FomenkoLebedev Physical Institute, Moscow, Russia 19E. GabathulerVinca Institute of Nuclear Sciences, Belgrade, SerbiaJ. GaylerS. GhazaryanA. Alikhanyan National LaboratoryA. GlazovI. GlushkovLAL, Univ. Paris-Sud, CNRS/IN2P3, Orsay, FranceL. GoerlichVinca Institute of Nuclear Sciences, Belgrade, SerbiaN. GogitidzeLAL, Univ. Paris-Sud, CNRS/IN2P3, Orsay, FranceM. GouzevitchC. GrabInstitut für Teilchenphysik, ETH, Zürich, Switzerland 21T. GreenshawDepartment of Physics, University of Liverpool, Liverpool, UK 12B.R. GrellDESY, Hamburg, GermanyG. GrindhammerMax-Planck-Institut für Physik, München, GermanyS. HabibInstitut National de Physique Nucléaire et de Physique des ParticulesD. HaidtC. HelebrantR. C. W. HendersonDepartment of Physics, University of Lancaster, Lancaster, UK 12E. HennekemperKirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany 11H. HenschelDESY, Zeuthen, GermanyM. HerbstKirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany 11G. HerreraDepartamento de Fisica, CINVESTAV, Mexico 17M. HildebrandtPaul Scherrer Institut, Villigen, SwitzerlandK. H. HillerDESY, Zeuthen, GermanyD. HoffmannCPPM, CNRS/IN2P3 – Univ. Mediterranee, Marseille, FranceR. HorisbergerLAL, Univ. Paris-Sud, CNRS/IN2P3, Orsay, FranceT. HreusInter-University Institute for High Energies ULB-VUB, Brussels, Universiteit Antwerpen, Antwerpen, Belgium 13M. JacquetInstitut National de Physique Nucléaire et de Physique des ParticulesM.E. JanssenX. JanssenNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaL. JönssonVinča Institute of Nuclear SciencesA. JungKirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany 11H. JungDESY, Hamburg, GermanyM. KapichineJoint Institute for Nuclear Research, Dubna, RussiaJ. KatzyI. R. KenyonUniversity College BirminghamC. KieslingMax-Planck-Institut für Physik, München, GermanyM. KleinDepartment of Physics, University of Liverpool, Liverpool, UK 12C. KleinwortT. KlugeDepartment of Physics, University of Liverpool, Liverpool, UK 12
2009en
ABI
Abstract
A search for single top quark production is performed in the full e ± p 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 σ ( e p → e t X ) < 0.25 pb is established at 95% CL. Limits on the anomalous coupling κ t u γ are derived.
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