COMPARISON OF THE PHOTOPRODUCTION OF $pi$$sup 0$ ON PROTONS WITH THE PREDICTION ACCORDING TO THE DISPERSION THEORY

Journal Article · Fri Jan 01 04:00:00 EST 1960 · Z. Physik

DOI:https://doi.org/10.1007/BF01338463· OSTI ID:4185126

Dietz, K; Hohler, G; Mullensiefen, A

The real parts of the photoamplitudes E/sub 1/ S/sub 1/2/, M/sub 1/ P/ sub 1/2/ , and M/sub 1/ P/sub 3/2/, were calculated from the angular distribution of the reaction gamma + p yields p + pi /sup 0/ measured by Goldansky et al. at 160 to 240 Mev. One of the solutions agreed with the theoretical prediction for the M/sub 1/ P/sub 3/2/, amplitude according to the dispersion method of Chew, Goldberger, Low, and Nambu. There was a discrepancy for M/sub 1/ P/sub 1/2/ if alpha /sub 11/ was taken from the effective range formula, but the positive values of alpha /sub 11/, necessary to give agreement, were not excluded by the results of the phase shift analysis, especially since Pontecorvo et al. recently found positive values at higher energies. The prediction for the real part of the E/sub 1/ S/sub 1/2/ amplitude agreed with the experimental data, if large recoil corrections were added which had been neglected by Chew et al. (auth)

• Research Organization: Universitat, Munich
• Sponsoring Organization: USDOE
• NSA Number: NSA-14-018416
• OSTI ID: 4185126
• Journal Information: Z. Physik, Journal Name: Z. Physik Vol. Vol: 159
• Country of Publication: Country unknown/Code not available
• Language: German

Related Subjects

ANGULAR DISTRIBUTION
DISPERSION RELATIONS
ELEMENTARY PARTICLES
FIELD THEORY
MEV RANGE
PARTICLE MODELS
PHOTOPRODUCTION
PHYSICS
PIONS
PIONS-NEUTRAL
PROTONS
RECOILS