Elastic photoproduction of ϱ0 mesons at HERA

S. Aïd,V. A. Andreev,Bernard Andrieu, R. D. Appuhn,M. Arpagaus,A. Babaev,J. Bähr,J. Bán,P. Ban,P. Baranov,E. Barrelet, R. Barschke,W. Bartel,M. Barth,U. Bassler,H. P. Beck,H. J. Behrend,A. Belousov,Ch. Berger,G. Bernardi, R. Bernet, G. Bertrand-Coremans,M. Besançon, R. Beyer,P. Biddulph, P. Bispham,J.C. Bizot, V. Blobel,K. Borras, F. Botterweck,V. Boudry, A. Braemer,W. Braunschweig,V. Brisson,D. Bruncko,C. R. Brune,R. Buchholz, L. Büngener,J. Bürger,F.W. Büsser, A. Buniatian,S. Bürke,M. J. Burton,G. Buschhorn, A. Campbell, T. Carli,F. Charles, M. Charlet,D. Clarke,A.B. Clegg,B. Clerbaux,S. Cocks,J. G. Contreras,C. M. Cormack, J. A. Coughlan, A. Courau,M. C. Cousinou, C. Coutures,G. Cozzika,L. Criegee,D. Cussans,J. Cvach,S. Dagoret,J. B. Dainton,W.D. Dau,K. Daum, M. David, C. L. Davis,B. Delcourt,A. De Roeck, E. A. De Wolf,M. Dirkmann,P. Dixon,P. Di Nezza,W. Długosz,C. Dollfus,J. D. Dowell,H. B. Dreis,A. Droutskoi, D. Düllmann,O. Dünger, H.H. Duhm,J. Ebert,T. R. Ebert, G. Eckerlin,V. 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Zhang, A. Zhokin,M. Zimmer,F. Zomer, J. Zsembery,Κ. Zuber, M. zurNedden

Nuclear Physics B（1996）

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摘要

The cross section for the elastic photoproduction of ϱ0 mesons (γp → ϱ0p) has been measured with the H1 detector at HERA for two average photon-proton centre-of-mass energies of 55 and 187 GeV. The lower energy point was measured by observing directly the ϱ0 decay giving a cross section of 9.1 ± 0.9 (stat.) ± 2.5 (syst.) μb. The logarithmic slope parameter of the differential cross section, dσ/dt, is found to be 10.9 ± 2.4 (stat.) ± 1.1 (syst.) GeV−2. The ϱ0 decay polar angular distribution is found to be consistent with s-channel helicity conservation. The higher energy cross section was determined from analysis of the lower part of the hadronic invariant mass spectrum of diffractive photoproduction and found to be 13.6 ± 0.8 (stat.) ± 2.4 (syst.) μb.

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ϱ0 mesons,elastic photoproduction

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