Search for light gravitinos in events with photons and missing transverse momentum at HERA
Å. AktasVladimir AndreevoT. AnthonisInter-University Institute for High Energies ULB-VUB , Brussels ,A. AsmoneDipartimento di Fisica, Università di Roma Tre and INFN Roma 3, Roma, ItalyA. BabaevLLR, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, FranceS. BackovićDESY, Zeuthen, GermanyJ. BährDESY, Zeuthen, GermanyP. BaranovPhysics Department, University of Lund, Lund, SwedenE. BarreletLPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, FranceW. BartelS. BaumgartnerInstitut für Teilchenphysik, ETH, Zürich, SwitzerlandJ. BeckerPhysics Department, University of Lund, Lund, SwedenM. BeckinghamPhysics Department , University of Manchester , Manchester , UKO. BehnkePhysikalisches Institut , Universität Heidelberg , Heidelberg , GermanyO. BehrendtInstitut für Physik , Universität Dortmund , Dortmund , GermanyA. BelousovQueen Mary and Westfield College, London, UKCh. BergerI Physikalisches Institut der RWTH, Aachen, GermanyN. BergerInstitut für Teilchenphysik, ETH, Zürich, SwitzerlandT. BerndtKirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, GermanyJ.C. BizotInstitut National de Physique Nucléaire et de Physique des ParticulesJ. BöhmeInstitut National de Physique Nucléaire et de Physique des ParticulesM.-O. BoenigInstitut für Physik , Universität Dortmund , Dortmund , GermanyV. BoudryLLR, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, FranceJ. BraciníkLAL, Université de Paris-Sud, IN2P3-CNRS, Orsay, FranceV. BrissonLAL , Université de Paris-Sud , IN2P3-CNRS , Orsay , FranceH.-B. BrökerIII Physikalisches Institut der RWTH , Aachen , GermanyDunstan BrownD. BrunckoInstitute of Experimental Physics , Slovak Academy of Sciences , Košice , Slovak RepublicF.W. BüsserInstitut für Experimentalphysik , Universität Hamburg , Hamburg , GermanyA. BunyatyanYerevan Physics Institute , Yerevan , ArmeniaG. BuschhornMax-Planck-Institut für Physik, München, GermanyL. Bystritskayaaf Faculty of Mathematics and Physics , Charles University , Praha , Czech RepublicA.J. CampbellS. CaronI Physikalisches Institut der RWTH , Aachen , GermanyF. Cassol-BrunnerCPPM, CNRS/IN2P3, Univ Mediterranee, Marseille, FranceK. ČernýInstitute for Nuclear Physics, Cracow, PolandV. ChekelianMax-Planck-Institut für Physik, München, GermanyJ.G. ContrerasDepartamento de Fisica Aplicada , CINVESTAV , Mérida , Yucatán , MexicoY.R. CoppensSchool of Physics and Astronomy , University of Birmingham , Birmingham , UKJ. A. CoughlanRutherford Appleton Laboratory , Chilton , Didcot , UKB. E. CoxPhysics Department , University of Manchester , Manchester , UKG. CozzikaCEA Paris-SaclayJ. CvachInstitute of Physics , Academy of Sciences of the Czech Republic , Praha , Czech RepublicJ.B. DaintonDepartment of Physics, University of Liverpool, Liverpool, UKW.D. DauETH , Zürich , SwitzerlandK. DaumAlso at Rechenzentrum Universität Wuppertal , Wuppertal , GermanyB. DelcourtUniversité Paris CitéR. DemirchyanYerevan Physics Institute , Yerevan , ArmeniaA. De RoeckAlso at CERN , Geneva , SwitzerlandK. DeschInstitut für Experimentalphysik , Universität Hamburg , Hamburg , GermanyE. A. De WolfInter-University Institute for High Energies ULB-VUB, Brussels, Universiteit Antwerpen, Antwerpen, BelgiumC. DiaconuUniversity of ZurichJ. DingfelderUniversité Paris CitéV. DodonovMax-Planck-Institut für Kernphysik, Heidelberg, GermanyA. DubakMax-Planck-Institut für Physik, München, GermanyC. DuprelRWTH Aachen UniversityG. EckerlinV. Efremenkoam Physik-Institut der Universität Zürich , Zürich , SwitzerlandS. EgliPaul Scherrer Institut , Villigen , SwitzerlandR. EichlerPaul Scherrer Institut , Villigen , SwitzerlandF. EiselePhysikalisches Institut , Universität Heidelberg , Heidelberg , GermanyM. EllerbrockPhysikalisches Institut , Universität Heidelberg , Heidelberg , GermanyE. ElsenM. ErdmannPeter FaulknerSchool of Physics and Astronomy , University of Birmingham , Birmingham , UKL. FavartJoint Institute for Nuclear Research, Dubna, RussiaA. FedotovInstitute for Theoretical and Experimental Physics, Moscow, RussiaR. FelstInstitute for Nuclear Physics, Cracow, PolandJ. FerenceiInstitut National de Physique Nucléaire et de Physique des ParticulesM. FleischerJoint Institute for Nuclear Research, Dubna, RussiaP. FleischmannInstitute for Nuclear Physics, Cracow, PolandY.H. FlemingDESY , Hamburg , GermanyG. Fluckeaf Faculty of Mathematics and Physics, Charles University, Praha, Czech RepublicG. FlüggeIII Physikalisches Institut der RWTH , Aachen , GermanyA. FomenkoQueen Mary and Westfield College, London, UKI. ForestiUniversité Paris CitéJ. FormánekCentre National de la Recherche ScientifiqueG. FrankeJoint Institute for Nuclear Research, Dubna, RussiaG. FrisingLAL, Université de Paris-Sud, IN2P3-CNRS, Orsay, FranceE. GabathulerInstitute for Nuclear Physics, Cracow, PolandK. GabathulerPaul Scherrer Institut , Villigen , SwitzerlandE. Garuttiaf Faculty of Mathematics and Physics, Charles University, Praha, Czech RepublicJ. GarveyInstitut National de Physique Nucléaire et de Physique des ParticulesJ. GaylerUniversité Paris CitéR. GerhardsInstitute for Nuclear Physics, Cracow, PolandC. GerlichPhysikalisches Institut , Universität Heidelberg , Heidelberg , GermanyS. GhazaryanYerevan Physics Institute , Yerevan , ArmeniaS. Ginzburgskayaam Physik-Institut der Universität Zürich , Zürich , SwitzerlandL. GoerlichPhysics Department, University of Lund, Lund, SwedenN. Gogitidzeam Physik-Institut der Universität Zürich, Zürich, SwitzerlandS. GorbounovDESY , Zeuthen , Germany al Institut für Teilchenphysik ,C. GrabInstitut National de Physique Nucléaire et de Physique des ParticulesH. GrässlerQueen Mary and Westfield College, London, UKT. GreenshawDepartment of Physics , University of Liverpool , Liverpool , UKM. GregoriInstitute for Nuclear Physics, Cracow, PolandG. GrindhammerMax-Planck-Institut für Physik, München, GermanyC. B. GwilliamUniversité Paris CitéD. HaidtDESY , Hamburg , GermanyL. Hajdukam Physik-Institut der Universität Zürich, Zürich, SwitzerlandJ. HallerUniversité Paris Cité
2005en
ABI
Аннотация
A search for gravitinos produced in e±p collisions is performed using the H1 detector at HERA. The data were taken at a centre-of-mass energy of 319 GeV and correspond to an integrated luminosity of 64.3 pb−1 for e+p collisions and 13.5 pb−1 for e−p collisions. If R-parity is not conserved, the t-channel exchange of a selectron can produce a neutralino, which, in models where the gravitino is the lightest supersymmetric particle, subsequently decays into a photon and a light gravitino. The resulting event signature, which involves an isolated photon, a jet and missing transverse energy, is analysed for the first time at HERA. No deviation from the Standard Model is found. Exclusion limits on the cross section and on R-parity-violating Yukawa couplings are derived in a Gauge Mediated Supersymmetry Breaking scenario. The results are independent of the squark sector. Neutralinos and supersymmetric partners of the left-handed electron with masses up to 112 GeV and 164 GeV, respectively, can be ruled out at the 95% confidence level for R-parity-violating couplings λ′ equal to 1, in some parts of the parameter space of the considered model.
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