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Charged ρ photoproduction in the energy range 2.8–4.8 GeV |
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| Authors: | D P Barber J B Dainton L C Y Lee R Marshall J C Thompson D T Williams T J Brodbeck G Frost A M Osborne G N Patrick G F Pearce T Sloan G R Brookes W J Haynes P B Wilkes LAMP Group |
| Institution: | 1. Daresbury Laboratory, Science Research Council, Daresbury, WA4 4AD, Warrington, U.K. 4. University of London Computer Centre, 20 Guilford Street, WC1N 1 DZ, London, U.K. 7. Department of Physics, University of Lancaster, Bailrigg, LA1 4YB, Lancaster, U.K. 9. Department of Physics, University of Sheffield, S3 7RH, Sheffield, U.K. |
| Abstract: | Measurements of the photoproduction processes γρ→ρ+ n and γρ→ρ-Δ++ (1236) are reported in the energy range 2.8 to 4.8 GeV. The data show shrinkage of the differential cross section in this energy region for the process γρ→ρ-Δ++ (1236); no shrinkage is observed for the ρ+ n process. The energy dependences of the ρ+ n and ρ-Δ++ (1236) total cross sections are much steeper than current model prediction. The ρ spin density matrices for each process are also presented. |
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