Search for lepton flavour violation at HERA
F. D. AaronNational Institute for Physics and Nuclear Engineering (NIPNE) ,Bucharest,RomaniaC. AlexaNational Institute for Physics and Nuclear Engineering (NIPNE) ,Bucharest,RomaniaV. AndreevLebedev Physical Institute, Moscow, Russia 23S. BackovićFaculty of Science, University of Montenegro, Podgorica, Montenegro 24A. BaghdasaryanYerevan Physics Institute, Yerevan, ArmeniaS. BaghdasaryanYerevan Physics Institute, Yerevan, ArmeniaE. BarreletLaboratoire de Physique Nucléaire et de Hautes ÉnergiesW. BartelK. BegzsurenInstitute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, MongoliaA. BelousovLebedev Physical Institute, Moscow, Russia 23P. BelovJ.C. BizotInstitut National de Physique Nucléaire et de Physique des ParticulesV. BoudryLLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, FranceI. Božović-Jelisavc̆ićVinca Institute of Nuclear Sciences, University of Belgrade, 1100 Belgrade, SerbiaJ. BraciníkSchool of Physics and Astronomy, University of Birmingham, Birmingham, UK 14G. BrandtMartin BrinkmannV. BrissonLAL, Université Paris-Sud, CNRS/IN2P3, Orsay, FranceD. BritzgerD. BrunckoSlovak Academy of Sciences, Bratislava, SlovakiaA. BunyatyanMax-Planck-Institut für Kernphysik, Heidelberg, GermanyG. BuschhornMax Planck Institute for PhysicsL. BystritskayaVinca Institute of Nuclear Sciences, University of Belgrade, 1100 Belgrade, SerbiaAlan CampbellK. B. Cantun AvilaCenter for Research and Advanced Studies of the National Polytechnic Institute, Mexico City, MexicoF. CeccopieriUniversity of Antwerp, Antwerp, BelgiumK. ČernýFaculty of Mathematics and Physics, Charles University, Praha, Czech Republic 25V. ČernýSlovak Academy of Sciences, Bratislava, SlovakiaV. ChekelianMax Planck Society, Munich, GermanyJ.G. ContrerasCenter for Research and Advanced Studies of the National Polytechnic Institute, Mexico City, MexicoJ. A. CoughlanRutherford Appleton Laboratory, Chilton, Didcot, UK 14J. CvachInstitute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic 25J.B. DaintonDepartment of Physics, University of Liverpool, Liverpool, UK 14K. DaumFachbereich C, Universität Wuppertal, Wuppertal, GermanyB. DelcourtInstitut National de Physique Nucléaire et de Physique des ParticulesJ. DelvaxUniversity of Antwerp, Antwerp, BelgiumE. A. De WolfUniversity of Antwerp, Antwerp, BelgiumC. DiaconuCPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, FranceM. DobreInstitut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 18V. DodonovMax Planck Institute for Nuclear PhysicsA. DossanovMax-Planck-Institut für Physik, München, GermanyA. DubakFaculty of Science, University of Montenegro, Podgorica, Montenegro 24G. EckerlinS. EgliPaul Scherrer Institut, Villigen, SwitzerlandA. EliseevLebedev Physical Institute, Moscow, Russia 23E. ElsenDESY, Hamburg, GermanyL. FavartInter-University Institute for High Energies ULB–VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium 15A. FedotovInstitute for Theoretical and Experimental Physics, Moscow, Russia 22R. FelstJ. FeltesseCEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, FranceJ. FerenceiInstitute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic 19D.-J. FischerM. FleischerA. FomenkoLebedev Physical Institute, Moscow, Russia 23E. GabathulerDepartment of Physics, University of Liverpool, Liverpool, UK 14J. GaylerS. GhazaryanDESY, Hamburg, GermanyA. GlazovL. GoerlichVinca Institute of Nuclear Sciences, University of Belgrade, 1100 Belgrade, SerbiaN. GogitidzeLebedev Physical Institute, Moscow, Russia 23M. GouzevitchC. GrabSwiss National Science Foundation, Bern, SwitzerlandA. GrebenyukT. GreenshawDepartment of Physics, University of Liverpool, Liverpool, UK 14B.R. GrellG. GrindhammerMax Planck Society, Munich, GermanyS. HabibInstitut National de Physique Nucléaire et de Physique des ParticulesD. HaidtC. HelebrantR. C. W. HendersonDepartment of Physics, University of Lancaster, Lancaster, UK 14E. HennekemperKirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany 18H. HenschelYerevan Physics Institute, Yerevan, ArmeniaM. HerbstKirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany 18G. HerreraDepartamento de Fisica, CINVESTAV IPN, México City, Mexico 21M. HildebrandtPaul Scherrer Institut, Villigen, SwitzerlandK. H. HillerDESY, Zeuthen, GermanyD. HoffmannCPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, FranceR. HorisbergerPaul Scherrer Institut, Villigen, SwitzerlandT. HreusInter-University Institute for High Energies ULB–VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium 15F. HuberPhysikalisches Institut, Universität Heidelberg, Heidelberg, Germany 18M. JacquetLAL, Université Paris-Sud, CNRS/IN2P3, Orsay, FranceX. JanssenUniversity of Antwerp, Antwerp, BelgiumL. JönssonPhysics Department, University of Lund, Lund, Sweden 20H. JungDESY, Hamburg, GermanyM. KapichineJoint Institute for Nuclear Research, Dubna, RussiaI. R. KenyonSchool of Physics and Astronomy, University of Birmingham, Birmingham, UK 14C. KieslingMax Planck Society, Munich, GermanyM. KleinDepartment of Physics, University of Liverpool, Liverpool, UK 14C. KleinwortT. KlugeDepartment of Physics, University of Liverpool, Liverpool, UK 14R. KoglerP. KostkaDESY, Zeuthen, GermanyM. KraemerJ. KretzschmarDepartment of Physics, University of Liverpool, Liverpool, UK 14K. KrügerUniversity of Liverpool, Liverpool, United KingdomM. P. J. LandonQueen Mary and Westfield College, London, UK 14W. LangeDESY, Zeuthen, GermanyG. Laštovička-MedinFaculty of Science, University of Montenegro, Podgorica, Montenegro 24P. LaycockUniversity of Montenegro, Podgorica, MontenegroA. LebedevLebedev Physical Institute, Moscow, Russia 23
2011en
ABI
Аннотация
A search for second and third generation scalar and vector leptoquarks produced in ep collisions via the lepton flavour violating processes e p → μ X and e p → τ X is performed by the H1 experiment at HERA. The full data sample taken at a centre-of-mass energy s = 319 GeV is used for the analysis, corresponding to an integrated luminosity of 245 pb −1 of e + p and 166 pb −1 of e − p collision data. No evidence for the production of such leptoquarks is observed in the H1 data. Leptoquarks produced in e ± p collisions with a coupling strength of λ = 0.3 and decaying with the same coupling strength to a muon–quark pair or a tau–quark pair are excluded at 95% confidence level up to leptoquark masses of 712 GeV and 479 GeV, respectively.
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