Leptoquarks in lepton-quark collisions |
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| Institution: | 1. Institut für Theoretische Physik, Universität Hannover, D-3000 Hannover, Fed. Rep. Germany;2. Deutsches Elektronen-Synchrotron DESY, D-2000 Hamburg, Fed. Rep. Germany;3. Theoretische Physik, ETH, CH-8093 Zürich, Switzerland;1. INFN, Sezione di Roma Tre, Via della Vasca Navale 84, I-00146 Roma, Italy;2. Dipartimento di Fisica, Università di Roma “La Sapienza”, P.le A. Moro 2, I-00185 Roma, Italy;3. INFN, Sezione di Roma, P.le A. Moro 2, I-00185 Roma, Italy;4. Theory Center, IPNS, KEK, Tsukuba 305-0801, Japan;5. SISSA, via Bonomea 265, I-34136 Trieste, Italy;1. Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan;2. Systems Engineering and Science, Shibaura Institute of Technology, 307 Fukasaku, Minuma-ku, Saitama City, Saitama, Japan;1. School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, PR China;2. Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics, Chongqing University, Chongqing 401331, PR China;1. Dipartimento di Fisica e Astronomia ‘G. Galilei’, Università di Padova, Italy;2. Istituto Nazionale Fisica Nucleare, Sezione di Padova, I–35131 Padova, Italy;1. Laboratoire de Physique Théorique, CNRS/Univ. Paris-Sud 11 (UMR 8627), 91405 Orsay Cedex, France;2. Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain;3. Theoretische Physik 1, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany |
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| Abstract: | Low-energy experiments permit the existence of leptoquarks with masses of order 100 GeV and couplings to quark-lepton pairs as large as gauge couplings. We study systematically the signatures of all possible scalar and vector leptoquarks in electron (positron)-proton collisions. Clear evidence for leptoquarks would be narrow peaks in the x-distributions of inclusive neutral and charged current processes. At HERA one will be able to explore the mass range up to 300 GeV through direct production, and even somewhat beyond the CM energy of 314 GeV through virtual effects. Conversely, leptoquarks with masses of 200 GeV can be discovered for couplings as small as 10−3 αem. |
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