Search for excited quarks in ep collisions at HERA
F. D. AaronNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaC. AlexaNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaK. AlimujiangVladimir AndreevLebedev Physical Institute, Moscow, Russia 17B. AntunovićA. AsmoneSapienza University of Rome, Rome, ItalyS. BackovićFaculty of Science, University of Montenegro, Podgorica, Montenegro 17A. BaghdasaryanYerevan Physics Institute, Yerevan, ArmeniaE. BarreletLPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, FranceW. BartelK. BegzsurenInstitute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, MongoliaA. BelousovLebedev Physical Institute, Moscow, Russia 17J.C. BizotInstitut National de Physique Nucléaire et de Physique des ParticulesV. BoudryÉcole Polytechnique, Palaiseau, FranceI. Božović-Jelisavc̆ićVinca Institute of Nuclear Sciences, Belgrade, SerbiaJ. BraciníkUniversity of BirminghamG. BrandtMartin BrinkmannInstitut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 13V. BrissonInstitut National de Physique Nucléaire et de Physique des ParticulesD. BrunckoSlovak Academy of Sciences, Bratislava, SlovakiaA. BunyatyanMax Planck Society, Munich, GermanyG. BuschhornMax Planck Institute for PhysicsL. BystritskayaInstitute for Theoretical and Experimental Physics, Moscow, Russia 23Alan CampbellK. B. Cantun AvilaCenter for Research and Advanced Studies of the National Polytechnic Institute, Mexico City, MexicoF. Cassol-BrunnerCPPM, CNRS/IN2P3 – Univ. Mediterranee, Marseille, FranceK. ČernýFaculty of Mathematics and Physics, Charles University, Praha, Czech Republic 20V. ČernýSlovak Academy of Sciences, Bratislava, SlovakiaV. ChekelianMax Planck Institute for PhysicsA. CholewaJ.G. ContrerasCenter for Research and Advanced Studies of the National Polytechnic Institute, Mexico City, MexicoJ. A. CoughlanRutherford Appleton Laboratory, Chilton, Didcot, UK 14G. CozzikaDSM (Netherlands), Heerlen, NetherlandsJ. CvachInstitute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic 20J.B. DaintonDepartment of Physics, University of Liverpool, Liverpool, UK 14K. DaumFachbereich C, Universität Wuppertal, Wuppertal, GermanyMichal DeákY. de BoerLLR, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, FranceB. DelcourtLAL, Univ. Paris-Sud, CNRS/IN2P3, Orsay, FranceM. Del DeganInstitut für Teilchenphysik, ETH, Zürich, Switzerland 21J. DelvaxUniversity of Antwerp, Antwerp, BelgiumA. De RoeckDESY, Hamburg, GermanyE. A. De WolfUniversity of Antwerp, Antwerp, BelgiumC. DiaconuCPPM, CNRS/IN2P3 – Univ. Mediterranee, Marseille, FranceV. DodonovMax-Planck-Institut für Kernphysik, Heidelberg, GermanyA. DossanovMax Planck Society, Munich, GermanyA. DubakFaculty of Science, University of Montenegro, Podgorica, Montenegro 17G. EckerlinV. EfremenkoInstitut National de Physique Nucléaire et de Physique des ParticulesS. EgliInstitut National de Physique Nucléaire et de Physique des ParticulesA. EliseevLebedev Physical Institute, Moscow, Russia 17E. ElsenVinca Institute of Nuclear Sciences, Belgrade, SerbiaA. FalkiewiczInstitute for Nuclear Physics, Cracow, Poland 16Peter FaulknerUniversity of BirminghamL. FavartUniversity of Antwerp, Antwerp, BelgiumA. FedotovInstitute for Theoretical and Experimental Physics, Moscow, Russia 23R. FelstJ. FeltesseCEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, FranceJ. FerenceiSlovak Academy of Sciences, Bratislava, SlovakiaD.-J. FischerM. FleischerA. FomenkoLebedev Physical Institute, Moscow, Russia 17E. GabathulerDepartment of Physics, University of Liverpool, Liverpool, UK 14J. GaylerS. GhazaryanYerevan Physics Institute, Yerevan, ArmeniaA. GlazovI. GlushkovDESY, Zeuthen, GermanyL. GoerlichVinča Institute of Nuclear SciencesN. GogitidzeLebedev Physical Institute, Moscow, Russia 17M. GouzevitchC. GrabInstitut für Teilchenphysik, ETH, Zürich, Switzerland 21T. GreenshawDepartment of Physics, University of Liverpool, Liverpool, UK 14B.R. GrellG. GrindhammerMax Planck Institute for PhysicsS. HabibInstitut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 13D. HaidtC. HelebrantR. C. W. HendersonDepartment of Physics, University of Lancaster, Lancaster, UK 14E. HennekemperKirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany 13H. HenschelYerevan Physics Institute, Yerevan, ArmeniaM. HerbstKirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany 13G. HerreraCenter for Research and Advanced Studies of the National Polytechnic Institute, Mexico City, MexicoM. HildebrandtPaul Scherrer Institut, Villigen, SwitzerlandK. H. HillerDESY, Zeuthen, GermanyD. HoffmannCentre National de la Recherche Scientifique, Paris, FranceR. HorisbergerPaul Scherrer Institut, Villigen, SwitzerlandT. HreusUniversity of Antwerp, Antwerp, BelgiumM. JacquetLAL, Univ. Paris-Sud, CNRS/IN2P3, Orsay, FranceM.E. JanssenX. JanssenInter-University Institute for High Energies ULB-VUB, Brussels; Universiteit Antwerpen, Antwerpen; Belgium 15V. JemanovInstitut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 13L. JönssonPhysics Department, University of Lund, Lund, Sweden 19A. JungKirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany 13H. JungDESY, Hamburg, GermanyM. KapichineJoint Institute for Nuclear Research, Dubna, RussiaJ. KatzyI. R. KenyonSchool of Physics and Astronomy, University of Birmingham, Birmingham, UK 14C. KieslingMax Planck Institute for PhysicsM. KleinDepartment of Physics, University of Liverpool, Liverpool, UK 14C. Kleinwort
2009en
ABI
Abstract
A search for excited quarks is performed using the full e ± p data sample collected by the H1 experiment at HERA, corresponding to a total integrated luminosity of 475 pb − 1 . The electroweak decays of excited quarks q ∗ → q γ , q ∗ → q Z and q ∗ → q W with subsequent hadronic or leptonic decays of the W and Z bosons are considered. No evidence for first generation excited quark production is found. Mass dependent exclusion limits on q ∗ production cross sections and on the ratio f / Λ of the coupling to the compositeness scale are derived within gauge mediated models. These limits extend the excluded region compared to previous excited quark searches.
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