Photoproduction on hydrogen of ρ0 mesons between threshold and 6 BeV

H. R. Crouch*, R. Hargraves, B. Kendall, R. E. Lanou, A. M. Shapiro, M. Widgoff, G. E. Fisher, C. Bordner, A. E. Brenner, M. E. Law, U. Maor, T. A. O'Halloran, F. D. Rudnick, K. Strauch, J. C. Street, J. J. Szymanski, P. Bastien, B. T. Feld, V. K. Fischer, I. A. PlessA. Rogers, C. Rogers, E. E. Ronat, L. Rosenson, T. L. Watts, R. K. Yamamoto, G. Calvelli, F. Gasparini, L. Guerriero, J. Massimo, G. A. Salandin, L. Ventura, C. Voci, F. Waldner, A. Brandstetter, Y. Eisenberg, A. Levy

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Data are presented on the details of the interaction γ+p→p+ρ0 observed in a 12-in. hydrogen bubble chamber exposed to a bremsstrahlung photon beam of 6-BeV maximum energy at the Cambridge Electron Accelerator. The energy dependence of the cross sections, the production angular distributions, and the decay angular distributions of the ρ0's are compared with the predictions of the one-pion-exchange (OPE) mechanism and with a diffraction or multiperipheral model proposed by Berman and Drell. These data, as well as a comparison with ω0 and with ρ0+N*(1238) production, reject the OPE model and favor a diffraction mechanism.

Original languageEnglish
Pages (from-to)994-1000
Number of pages7
JournalPhysical Review
Issue number4
StatePublished - 1966
Externally publishedYes


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