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, Joshua A Becker, M Beckingham,O Behnke,O Behrendt,A Belousov,Ch Berger, N Berger,T Berndt,J C Bizot, J Bohme,M O Boenig,V Boudry, J Bracinik, V Brisson,H B Broker,D P Brown,D Bruncko,F W Busser,A Bunyatyan,G Buschhorn,L Bystritskaya,Alan Campbell,S Caron,F Cassolbrunner,K Cerny,V Chekelian,J G Contreras,Y R Coppens,J A Coughlan,B Cox,G Cozzika,J Cvach,J B Dainton,W D Dau,K Daum,B Delcourt,R Demirchyan,A De Roeck,K Desch,E A De Wolf,C Diaconu, J Dingfelder,V V Dodonov,A Dubak,C Duprel, G Eckerlin,V Efremenko,S Egli,R Eichler, F Eisele,M Ellerbrock,E Elsen, W Erdmann,P J W Faulkner,Laurent Favart,A Fedotov,R Felst, J Ferencei,M Fleischer, P Fleischmann,Y H Fleming, G Flucke,G Flugge,A Fomenko,I Foresti,J Formanek,G Franke,G Frising, E Gabathuler, K Gabathuler,Erika 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,Carl Gwilliam,D Haidt,L Hajduk,J O Haller,M Hansson, G Heinzelmann,Robert Henderson,H Henschel,O Henshaw,G Herrera,I Herynek,R D Heuer,M Hildebrandt, K H Hiller,P Hoting,D Hoffmann, R Horisberger,A Hovhannisyan, M Ibbotson,Mohamed A Ismail,M Jacquet,L Janauschek,X Janssen,V Jemanov,L Jonsson,D Johnson,H Jung,D Kant,M Kapichine,Mats O Karlsson,J Katzy,N Keller,I R 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,M P J Landon, W Lange,T Lastovicka,P Laycock, A Lebedev, B Leisner,R Lemrani, V Lendermann,S Levonian,L Lindfeld,K Lipka,B List, E Lobodzinska,N Loktionova, R Lopezfernandez,V Lubimov,H Lueders,D Luke,T Lux,L Lytkin,A Makankine,N Malden,E Malinovski,S Mangano,Pierre Marage,J Marks, R Marshall,M Martisikova,H U Martyn, S J Maxfield,D Meer,A Mehta,K Meier, A Meyer,H Meyer,J Meyer,S Mikocki,I Milcewiczmika,David Milstead,Amal A Mohamed,F Moreau,A Morozov,J V Morris, M U Mozer, K H Muller,P Murin,V Nagovizin,K Nankov,B Naroska,J Naumann,Th Naumann, P R Newman,C Niebuhr, A Nikiforov,D Nikitin,G Nowak,M Nozicka,R Oganezov,B Olivier,J E Olsson,D Ozerov, A A Paramonov,C Pascaud,G D Patel, M Peez,E Perez,Adrian Perieanu,Alexey Petrukhin, D Pitzl, R Placakytė,R Poschl,B Portheault, B Povh,N Raicevic,P Reimer,B Reisert,A Rimmer,C Risler,E Rizvi, P Robmann, Benoit Roland,R Roosen,A Rostovtsev,Z Rurikova, S V Rusakov,K Rybicki,D P C Sankey,E Sauvan, S Schatzel,J Scheins,F P Schilling, P Schleper,S Schmidt,Sabine Schmitt,M Schneider,L Schoeffel,A Schoning,V Schroder,H C Schultzcoulon, C Schwanenberger,K Sedlak,F Sefkow,I Sheviakov,L N 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 A Thompson,P D Thompson,F Tomasz,D Traynor,P Truol, G Tsipolitis,I Tsurin,J Turnau,E Tzamariudaki,Ali I Uraev,Marcel Urban,A Usik,D Utkin, S Valkar,A Valkarova,C Vallee,P Van Mechelen,N Van Remortel,A Vargas Trevino,Y Vazdik, C Veelken,Anja Vest,S Vinokurova,V Volchinski,K Wacker,John A Wagner,G Weber, R J Weber,D Wegener,C Werner,N Werner,M Wessels,B Wessling,G G Winter,Ch Wissing, E E Woehrling,R Wolf,E Wunsch,S Xella,Wei Yan,V Yeganov,J žacek,J Zalesak,Zhiliang 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 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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