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Search for first generation leptoquarks in ep collisions at HERA |
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| Institution: | a I. Physikalisches Institut der RWTH, Aachen, Germany b Vinca Institute of Nuclear Sciences, University of Belgrade, 1100 Belgrade, Serbia c School of Physics and Astronomy, University of Birmingham, Birmingham, UK1414Supported by the UK Science and Technology Facilities Council, and formerly by the UK Particle Physics and Astronomy Research Council. d Inter-University Institute for High Energies, ULB-VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium1515Supported by FNRS-FWO-Vlaanderen, IISN-IIKW and IWT and by Interuniversity Attraction Poles Programme, Belgian Science Policy. e National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania1616Supported by the Romanian National Authority for Scientific Research under the contract PN 09370101. f Rutherford Appleton Laboratory, Chilton, Didcot, UK14 g Institute for Nuclear Physics, Cracow, Poland1717Partially Supported by Polish Ministry of Science and Higher Education, grant DPN/N168/DESY/2009. h Institut für Physik, TU Dortmund, Dortmund, Germany1818Supported by the Bundesministerium für Bildung und Forschung, FRG, under contract Nos. 05H09GUF, 05H09VHC, 05H09VHF, 05H16PEA. i Joint Institute for Nuclear Research, Dubna, Russia j CEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, France k DESY, Hamburg, Germany l Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany18 m Max-Planck-Institut für Kernphysik, Heidelberg, Germany n Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany18 o Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany18 p Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic1919Supported by VEGA SR grant No. 2/7062/27. q Department of Physics, University of Lancaster, Lancaster, UK14 r Department of Physics, University of Liverpool, Liverpool, UK14 s Queen Mary and Westfield College, London, UK14 t Physics Department, University of Lund, Lund, Sweden2020Supported by the Swedish Natural Science Research Council. u CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France v Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico2121Supported by CONACYT, México, grant 48778-F. w Departamento de Fisica, CINVESTAV IPN, México City, Mexico21 x Institute for Theoretical and Experimental Physics, Moscow, Russia2222Russian Foundation for Basic Research (RFBR), grant No. 1329.2008.2. y Lebedev Physical Institute, Moscow, Russia2323Supported by the Deutsche Forschungsgemeinschaft. z Max-Planck-Institut für Physik, München, Germany aa LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France ab LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France ac LPNHE, Université Pierre et Marie Curie Paris 6, Université Denis Diderot Paris 7, CNRS/IN2P3, Paris, France ad Faculty of Science, University of Montenegro, Podgorica, Montenegro2424Partially Supported by Ministry of Science of Montenegro, No. 05-1/3-3352. ae Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic2525Supported by the Ministry of Education of the Czech Republic under the projects LC527, INGO-LA09042 and MSM0021620859. af Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic25 ag Dipartimento di Fisica, Università di Roma Tre and INFN Roma 3, Roma, Italy ah Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria23 ai Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia aj Paul Scherrer Institut, Villigen, Switzerland ak Fachbereich C, Universität Wuppertal, Wuppertal, Germany al Yerevan Physics Institute, Yerevan, Armenia am DESY, Zeuthen, Germany an Institut für Teilchenphysik, ETH, Zürich, Switzerland2626Supported by the Swiss National Science Foundation. ao Physik-Institut der Universität Zürich, Zürich, Switzerland26 |
| Abstract: | A search for first generation scalar and vector leptoquarks produced in ep collisions is performed by the H1 experiment at HERA. The full H1 data sample is used in the analysis, corresponding to an integrated luminosity of 446 pb−1. No evidence for the production of leptoquarks is observed in final states with a large transverse momentum electron or with large missing transverse momentum, and constraints on leptoquark models are derived. For leptoquark couplings of electromagnetic strength λ=0.3, first generation leptoquarks with masses up to 800 GeV are excluded at 95% confidence level. |
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