Diffractive Photoproduction Of Rho Mesons With Large Momentum Transfer At Hera
A. Aktas,V. Andreev,T. Anthonis,B. Antunovic,S. Aplin,A. Asmone,A. Astvatsatourov,A. Babaev,S. Backovic,A. Baghdasaryan,P. Baranov,E. Barrelet,W. Bartel,S. Baudrand,S. Baumgartner,J. Becker,M. Beckingham,O. Behnke,O. Behrendt,A. Belousov,N. Berger,J. C. Bizot,M. -O. Boenig,V. Boudry,J. Bracinik,G. Brandt,V. Brisson,D. Bruncko,F. W. Buesser,A. Bunyatyan,G. Buschhorn,L. Bystritskaya,A. J. Campbell,F. Cassol-Brunner,K. Cerny,V. Cerny,V. Chekelian,J. G. Contreras,J. A. Coughlan,B. E. Cox,G. Cozzika,J. Cvach,J. B. Dainton,W. D. Dau,K. Daum,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,P. Fleischmann,G. Flucke,A. Fomenko,G. Franke,T. Frisson,E. Gabathuler,E. Garutti,J. Gayler,C. Gerlich,S. Ghazaryan,S. Ginzburgskaya,A. Glazov,I. Glushkov,L. Goerlich,M. Goettlich,N. Gogitidze,S. Gorbounov,C. Grab,T. Greenshaw,M. Gregori,B. R. Grell,G. Grindhammer,C. Gwilliam,D. Haidt,L. Hajduk,M. Hansson,G. Heinzelmann,R. C. W. Henderson,H. Henschel,G. Herrera,M. Hildebrandt,K. H. Hiller,D. Hoffmann,R. Horisberger,A. Hovhannisyan,T. Hreus,S. Hussain,M. Ibbotson,M. Ismail,M. Jacquet,L. Janauschek,X. Janssen,V. Jemanov,L. Jonsson,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,G. Knies,A. Knutsson,V. Korbel,P. Kostka,K. Krastev,J. Kretzschmar,A. Kropivnitskaya,K. Krueger,M. P. J. Landon,W. Lange,T. Lastovicka,G. Lastovicka-Medin,P. Laycock,A. Lebedev,G. Leibenguth,V. Lendermann,S. Levonian,L. Linfield,K. Lipka,A. Liptaj,B. List,J. List,E. Lobodzinska,N. Loktionova,R. Lopez-Fernandez,V. Lubimov,A. I. Lucaci-Timoce,H. Lueders,D. Lueke,T. Lux,L. Lytkin,A. Makankine,N. Malden,E. Malinovski,S. Mangano,R. Marage,R. Marshall,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. Milstead,D. Mladenov,A. Mohamed,F. Moreau,A. Morozov,J. V. Morris,M. U. Mozer,K. Mueller,P. Murin,K. Nankov,B. Nozicka,Th. 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,T. Papadopoulou,C. Pascaud,G. D. Patel,H. Peng,E. Perez,D. Perez-Astudillo,A. Perieanu,A. Petrukhin,D. Pitzl,R. R. Placakyte,B. Portheault,B. Povh,P. Prideaux,A. J. Rahmat,N. Raicevic,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,E. Sauvan,S. Schaetzel,S. Schmidt,S. Schmitt,C. Schmitz,L. Schoeffel,A. Schoening,H. -C. Schultz-Coulon,F. Sefkow,R. N. Shaw-West,I. Sheviakov,L. N. Shtarkov,T. Sloan,P. Smirnov,Y. Soloviev,D. South,V. Spaskov,A. Specka,M. Steder,B. Stella,J. Stiewe,U. Straumann,D. Sunar,V. Tchoulakov,G. Thompson,P. D. Thompson,T. Toll,F. Tomasz,D. Traynor,P. Truoel,I. Tsakov,G. Tsipolitis,I. Tsurin,J. Turnau,E. Tzamariudaki,K. Urban,M. Urban,A. Usik,D. Utkin,A. Valkarova,C. Vallee,P. Van Mechelen,A. Vargas Trevino,Y. Vazdik,C. Veelken,S. Vinokurova,V. Volchinski,K. Wacker,G. Weber,R. Weber,D. Wegener,C. Werner,M. Wessels,B. Wessling,Ch. Wissing,R. Wolf,E. Wuensch,S. Xella,W. Yan,V. Yeganov,J. Zacek,J. Zalesak,Z. Zhang,A. Zhelezov,A. Zhokin,Y. C. Zhu,J. Zimmermann,T. Zimmermann,H. Zohrabyan,F. Zomer
PHYSICS LETTERS B（2006）
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摘要
The diffractive photoproduction of rho mesons, ep -> e rho Y, with large momentum transfer squared at the proton vertex, vertical bar t vertical bar, is studied with the H1 detector at HERA using an integrated luminosity of 20.1 pb(-1). The photon-proton centre of mass energy spans the range 75 < W < 95 GeV, the photon virtuality is restricted to Q(2) < 0.01 GeV2 and the mass My of the proton remnant is below 5 GeV. The t dependence of the cross section is measured for the range 1.5 < vertical bar t vertical bar < 10.0 GeV2 and is well described by a power law, d sigma/d vertical bar t vertical bar proportional to vertical bar t vertical bar(-n). The spin density matrix elements, which provide information on the helicity structure of the interaction, are extracted using measurements of angular distributions of the rho decay products. The data indicate a violation of s-channel helicity conservation, with contributions from both single and double helicity-flip being observed. The results are compared to the predictions of perturbative QCD models. (c) 2006 Elsevier B.V. All rights reserved.
