Search for Baryonic Resonances Decaying to ΞΠin Deep-Inelastic Scattering at HERA

A. Aktas,C. Alexa,V. Andreev,T. Anthonis,B. Antunovic,S. Aplin,A. Asmone,A. Astvatsatourov,S. Backovic,A. Baghdasaryan,P. Baranov,E. Barrelet,W. Bartel,S. Baudrand,M. Beckingham,K. Begzsuren,O. Behnke,O. Behrendt, A. Belousov,N. Berger,J.C. Bizot,M.-O. Boenig,V. Boudry,I. Bozovic-Jelisavcic,J. Bracinik,G. Brandt,M. Brinkmann,V. Brisson,D. Bruncko,F.W. Büsser,A. Bunyatyan, G. Buschhorn,L. Bystritskaya,A.J. Campbell,K.B. Cantun Avila,F. Cassol-Brunner,K. Cerny,V. Cerny,V. Chekelian,A. Cholewa,J.G. Contreras,J.A. Coughlan,G. Cozzika,J. Cvach,J.B. Dainton,K. Daum,M. Deak, Y. de Boer,B. Delcourt,M. Del Degan,A. De Roeck,E.A. De Wolf,C. Diaconu,V. Dodonov,A. Dubak,G. Eckerlin,V. Efremenko,S. Egli,R. Eichler,F. Eisele,A. Eliseev,E. Elsen,S. Essenov,A. Falkewicz,P.J.W. Faulkner,L. Favart,A. Fedotov,R. Felst,J. Feltesse, J. Ferencei,L. Finke,M. Fleischer,A. Fomenko,G. Franke,T. Frisson,E. Gabathuler,E. Garutti,J. Gayler,S. Ghazaryan,S. Ginzburgskaya,A. Glazov,I. Glushkov,L. Goerlich,M. Goettlich,N. Gogitidze,S. Gorbounov,M. Gouzevitch,C. Grab,T. Greenshaw, B.R. Grell,G. Grindhammer,S. Habib,D. Haidt,M. Hansson,G. Heinzelmann, C. Helebrant, R.C.W. Henderson,H. Henschel,G. Herrera,M. Hildebrandt,K.H. Hiller,D. Hoffmann,R. Horisberger,A. Hovhannisyan,T. Hreus,M. Jacquet,M.E. Janssen,X. Janssen,V. Jemanov,L. Jönsson,D.P. Johnson, A.W. Jung,H. Jung,M. Kapichine,J. Katzy,I.R. Kenyon,C. Kiesling,M. Klein,C. Kleinwort,T. Klimkovich,T. Kluge,A. Knutsson,V. Korbel,P. Kostka,M. Kraemer,K. Krastev,J. Kretzschmar,A. Kropivnitskaya,K. Krüger,M.P.J. Landon,W. Lange,G. Laštovička-Medin,P. Laycock,A. Lebedev,G. Leibenguth,V. Lendermann,S. Levonian,L. Lindfeld,K. Lipka,A. Liptaj,B. List,J. List,N. Loktionova,R. Lopez-Fernandez,V. Lubimov,A.-I. Lucaci-Timoce,L. Lytkin,A. Makankine,E. Malinovski,P. Marage,L. Marti,M. Martisikova,H.-U. Martyn,S.J. Maxfield,A. Mehta,K. Meier,A.B. Meyer,H. Meyer,J. Meyer,V. Michels,S. Mikocki,I. Milcewicz-Mika,D. Mladenov,A. Mohamed,F. Moreau,A. Morozov,J.V. Morris,M.U. Mozer, K. Müller,P. Murín,K. Nankov,B. Naroska,T. Naumann,P.R. Newman,C. Niebuhr,A. Nikiforov,G. Nowak,K. Nowak,M. Nozicka,R. Oganezov,B. Olivier,J.E. Olsson,S. Osman,D. Ozerov,V. Palichik,I. Panagoulias,M. Pandurovic,T. Papadopoulou,C. Pascaud,G.D. Patel,H. Peng,E. Perez,D. Perez-Astudillo,A. Perieanu,A. Petrukhin,I. Picuric,S. Piec, D. Pitzl,R. Plačakytė,B. Povh,T. Preda,P. Prideaux,A.J. Rahmat,N. Raicevic,T. Ravdandorj,P. Reimer,A. Rimmer,C. Risler,E. Rizvi,P. Robmann,B. Roland,R. Roosen,A. Rostovtsev,Z. Rurikova,S. Rusakov,F. Salvaire,D.P.C. Sankey,M. Sauter,E. Sauvan,S. Schmidt,S. Schmitt,C. Schmitz,L. Schoeffel,A. Schöning,H.-C. Schultz-Coulon,F. Sefkow, R.N. Shaw-West,I. Sheviakov,L.N. Shtarkov,T. Sloan,I. Smiljanic,P. Smirnov,Y. Soloviev,D. South,V. Spaskov,A. Specka,Z. Staykova, M. Steder,B. Stella,J. Stiewe,U. Straumann,D. Sunar,T. Sykora,V. Tchoulakov,G. Thompson,P.D. Thompson,T. Toll,F. Tomasz,D. Traynor,T.N. Trinh,P. Truöl,I. Tsakov,B. Tseepeldorj,G. Tsipolitis,I. Tsurin,J. Turnau,E. Tzamariudaki,K. Urban,D. Utkin,A. Valkárová,C. Vallée,P. Van Mechelen,A. Vargas Trevino,Y. Vazdik,S. Vinokurova,V. Volchinski,G. Weber,R. Weber,D. Wegener,C. Werner,M. Wessels,C. Wissing,R. Wolf, E. Wünsch,S. Xella,V. Yeganov,J. Žáček,J. Zálešák,Z. Zhang,A. Zhelezov, A. Zhokin,Y.C. Zhu,T. Zimmermann,H. Zohrabyan,F. Zomer, The H Collaboration

European physical journal C, Particles and fields（2007）

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摘要

A search for narrow baryonic resonances decaying into (cid:4) (cid:0) (cid:25) (cid:0) or (cid:4) (cid:0) (cid:25) + and their an-tiparticles is carried out with the H1 detector using deep inelastic scattering events at HERA in the range of negative photon four-momentum transfer squared 2 < Q 2 < 100 GeV 2 . No signal for a new baryonic state in the mass range 1600 (cid:0) 2300 MeV is observed in either the doubly charged or the neutral decay channels. The known baryon (cid:4)(1530) 0 is observed through its decay mode into (cid:4) (cid:0) (cid:25) + . Mass/dependent upper limits are given on the ratio of the production rates of new baryonic states, such as the hypothetical pentaquark states (cid:4) (cid:0)(cid:0) 5 q or (cid:4) 05 q , relative to the (cid:4)(1530) 0 baryon state. are no indications of any new baryonic state decaying into (cid:4) (cid:25) in the mass range 1600 (cid:0) 2300MeV. Thus H1 can not con(cid:12)rm the signal reported by the NA49 collaboration. Mass-dependent upper limits at the 95 % C.L. are set on the production ratio of hypothetical states, such as (cid:4) (cid:0)(cid:0) 5 q and (cid:4) 05 q , to the total number of observed (cid:4)(1530) 0 baryons. These limits are comparable to those measured by the ZEUS Collaboration[11].

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关键词

Transverse Momentum,Primary Vertex,Invariant Mass Spectrum,ZEUS Collaboration,Baryonic Resonance

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