Charged ρ photoproduction in the energy range 2.8–4.8 GeV

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

Zeitschrift für Physik C Particles and Fields（1979）

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摘要

Measurements of the photoproduction processes ????+n and ????-?++ (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 ????-?++ (1236); no shrinkage is observed for the ?+n process. The energy dependences of the ?+n and ?-?++ (1236) total cross sections are much steeper than current model prediction. The ? spin density matrices for each process are also presented.

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关键词

Shrinkage, Field Theory, Model Prediction, Elementary Particle, Quantum Field Theory

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