Elastic photoproduction of ρ0 mesons at HERA

  • S. Aid
  • , V. Andreev
  • , B. Andrieu
  • , R. D. Appuhn
  • , M. Arpagaus
  • , A. Babaev
  • , J. Bähr
  • , J. Bán
  • , Y. 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. Brune, R. Buchholz, L. Büngener, J. Bürger, F. W. Büsser, A. Buniatian, S. Burke, M. J. Burton, G. Buschhorn, A. J. Campbell, T. Carli, F. Charles, M. Charlet, D. Clarke, A. B. Clegg, B. Clerbaux, S. Cocks, J. G. Contreras, C. Cormack, J. A. Coughlan, A. Courau, M. C. Cousinou, Ch Coutures, G. Cozzika, L. Criegee, D. G. 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. Dlugosz, C. Dollfus, J. D. Dowell, H. B. Dreis, A. Droutskoi, D. Düllmann, O. Dünger, H. Duhm, J. Ebert, T. R. Ebert, G. Eckerlin, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, R. J. Ellison, E. Elsen, M. Erdmann, W. Erdmann, E. Evrard, A. B. Fahr, L. Favart, A. Fedotov, D. Feeken

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)3-29
Number of pages27
JournalNuclear Physics B
Volume463
Issue number1
DOIs
Publication statusPublished - 18 Mar 1996

Keywords

  • Decay angular distribution
  • Rho meson
  • Vector meson

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