Exclusive Ρ0 and Φ Production in Deep Inelastic Muon Scattering

European Muon Collaboration,J. Ashman,B. Badelek,G. Baum,J. Beaufays,C. P. Bee,C. Benchouk,I. G. Bird,S. C. Brown,M. C. Caputo, H. W. K. Cheung,J. Chima,J. Ciborowski,R. W. Clifft,G. Coignet,F. Combley,G. Court,G. D'Agostini,J. Drees,M. Düren,N. Dyce,A. W. Edwards,M. Edwards,T. Ernst,M. I. Ferrero,J. Foster,D. Francis,E. Gabathuler,J. Gajewski,R. Gamet,N. Geddes,V. Gibson,J. Gillies,P. Grafström,K. Hamacher,D. v. Harrach,P. Hayman,C. A. Heusch,J. R. Holt,V. W. Hughes,A. Jacholkowska, F. Janata,G. Jancso,T. Jones, E. M. Kabuss,B. Korzen,U. Krüner,S. Kullander,U. Landgraf,D. Lanske,F. Lettenström,T. Lindqvist,J. Loken,M. Matthews,Y. Mizuno,K. Mönig,F. Montanet,J. Nassalski,E. Nagy,P. R. Norton,G. Oakham,R. Oppenheim,A. M. Osborne,V. Papavassiliou,N. Pavel,C. Peroni,H. Peschel,R. Piegaia, B. Pietrzyk,U. Pietrzyk,B. Pönsgen,B. Povh,P. Renton,P. Ribarics,K. Rith,L. Rondio,L. Ropelewski,D. Salmon,A. Sandacz,M. Scheer,H. Schiemann,K. P. Schuler,K. Schultze,T -A. Shibata,T. Sloan,A. Staiano,H. E. Stier,J. Stock, M. Studt,G. N. Taylor,J. C. Thompson,J. Toth,S. Wheeler,L. Urban,T. Walcher,W. S. C. Williams,S. J. Wimpenny,R. Windmolders,W. J. Womersley

Zeitschrift für Physik C, Particles and fields（1988）

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摘要

Data are presented on exclusive ρ0 and ϕ production in deep inelastic muon scattering from a target consisting mainly of nitrogen. The ratio of the total cross sections for ρ0 and ϕ production is found to be 9∶(1.6±0.4) at 〈Q2〉=7.5 GeV2, consistent with theSU(3) prediction of 9∶2. Thet dependence for exclusive ρ0 production is found to become shallover asQ2 increases and, for largeQ2, thet dependence is typical of that for a hard scattering process. Furthermore, the ratio of the cross sections for coherent: incoherent production from nitrogen is found to decrease rapidly withQ2. Such behaviour indicates that even for exclusive vector meson production the virtual photon behaves predominantly as an electromagnetic probe.

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关键词

Field Theory,Elementary Particle,Quantum Field Theory,Total Cross Section,Particle Acceleration

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