Search for Light Gravitinos in Events with Photons and Missing Transverse Momentum at HERA

A Aktas,V Andreev,T Anthonis,A Asmone,A Babaev,S Backovic,J Bahr,P Baranov,E Barrelet,W Bartel,S Baumgartner,J Becker,M Beckingham,O Behnke,O Behrendt, A Belousov,C Berger,N Berger,T Berndt,JC Bizot,J Bohme,MO Boenig,V Boudry,J Bracinik,V Brisson,HB Broker,DP Brown,D Bruncko,FW Busser, A Bunyatyan, G Buschhorn,L Bystritskaya, AJ Campbell,S Caron,F Cassol-Brunner,K Cerny,V Chekelian,JG Contreras,YR Coppens,JA Coughlan,BE Cox,G Cozzika,J Cvach,JB Dainton,WD Dau,K Daum,B Delcourt,R Demirchyan,A De Roeck,K Desch,EA De Wolf,C Diaconu,J Dingfelder,V Dodonov,A Dubak,C Duprel,G Eckerlin,V Efremenko,S Egli,R Eichler,F Eisele,M Ellerbrock,E Elsen,W Erdmann,PJW Faulkner,L Favart,A Fedotov,R Felst, J Ferencei,M Fleischer,P Fleischmann,Y Fleming,G Flucke,G Flugge,A Fomenko,I Foresti,J Formanek,G Franke,G Frising,E Gabathuler,K Gabathuler,E Garutti,J Garvey,J Gayler,R Gerhards,C Gerlich,S Ghazaryan,S Ginzburgskaya,L Goerlich,N Gogitidze,S Gorbounov,C Grab,H Grassler,T Greenshaw,M Gregori,G Grindhammer,C Gwilliam,D Haidt,L Hajduk,J Haller,M Hansson,G Heinzelmann, RCW Henderson,H Henschel,O Henshaw,G Herrera,I Herynek,RD Heuer,M Hildebrandt,KH Hiller,P Hoting,D Hoffmann,R Horisberger,A Hovhannisyan,M Ibbotson,M Ismail,M Jacquet,L Janauschek,X Janssen, V Jemanov,L Jonsson, DP Johnson,H Jung,D Kant,M Kapichine,M Karlsson,J Katzy,N Keller,IR Kenyon,C Kiesling,M Klein,C Kleinwort,T Klimkovich,T Kluge,G Knies,A Knutsson,B Koblitz,V Korbel,P Kostka,R Koutouev,A Kropivnitskaya,J Kroseberg,K Kruger,J Kuckens,MPJ Landon,W Lange,T Lastovicka,P Laycock,A Lebedev, B Leissner,R Lemrani,V Lendermann,S Levonian,L Lindfeld,K Lipka,B List,E Lobodzinska,N Loktionova,R Lopez-Fernandez,V Lubimov,H Lueders,D Luke,T Lux,L Lytkin,A Makankine,N Malden,E Malinovski,S Mangano,P Marage,J Marks,R Marshall,M Martisikova,HU Martyn,SJ Maxfield,D Meer,A Mehta,K Meier,AB Meyer,H Meyer,J Meyer,S Mikocki,I Milcewicz-Mika,D Milstead,A Mohamed,F Moreau,A Morozov,JV Morris,MU Mozer,K Muller,P Murin,V Nagovizin,K Nankov,B Naroska,J Naumann,T Naumann,PR Newman,C Niebuhr,A Nikiforov,D Nikitin,G Nowak,M Nozicka,R Oganezov,B Olivier,JE Olsson,D Ozerov,A Paramonov,C Pascaud,GD Patel,M Peez,E Perez,A Perieanu,A Petrukhin,D Pitzl,R Placakyte,R Poschl,B Portheault,B Povh,N Raicevic,P Reimer,B Reisert,A Rimmer,C Risler,E Rizvi,P Robmann,B Roland,R Roosen,A Rostovtsev,Z Rurikova,S Rusakov,K Rybicki,DPC Sankey,E Sauvan,S Schatzel,J Scheins, RP Schilling,P Schleper,S Schmidt,S Schmitt,M Schneider,L Schoeffel,A Schoning,V Schroder,HC Schultz-Coulon,C Schwanenberger,K Sedlak,F Sefkow,I Sheviakov,LN Shtarkov,Y Sirois,T Sloan,P Smirnov,Y Soloviev,D South,V Spaskov,A Specka,H Spitzer,R Stamen,B Stella,J Stiewe,I Strauch,U Straumann,V Tchoulakov,G Thompson,PD Thompson, E Tomasz,D Traynor,P Truol,G Tsipolitis,I Tsurin,J Turnau,E Tzamariudaki,A Uraev,M Urban,A Usik,D Utkin,S Valkar,A Valkarova,C Vallee,P Van Mechelen,N Van Remortel,AV Trevino,Y Vazdik, C Veelken,A Vest,S Vinokurova,V Volchinski,K Wacker,J Wagner,G Weber, R Weber, D Wegener,C Werner,N Werner,M Wessels,B Wessling,GG Winter,C Wissing,EE Woehrling,R Wolf,E Wunsch,S Xella,W Yan,V Yeganov,J Zacek,J Zalesak,Z Zhang,A Zhelezov, A Zhokin,H Zohrabyan,F Zomer

Physics letters B（2005）

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摘要

A search for gravitinos produced in ep 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 lambda' equal to 1.

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