Multipole Analyses for p(gamma,pi) and p(gamma,gamma) in the region of the P33 delta Resonance

Details Multipole Analyses for p(gamma,pi) and p(gamma,gamma) in the region of the P33 delta Resonance Multipole Analyses for p(gamma,pi) and p(gamma,gamma) in the region of the P33 delta Resonance

1998-10-06

arxiv.org/abs/nucl-th/9810019v1

Few Body Syst.Suppl.11:144-156,1999

Physics

Nuclear Physics

Nuclear Theory

13 pages; Presented at the Workshop on "N* Physics and non-perturbative QCD", European Centre for Nuclear Theory, Trento, May

Scientific paper

Multipole analyses of the p(g,pi0), p(g,pi+) and p(g,g) reactions are carried out using different data sets. With sufficient constraints from polarization observables, the ratio of E2/M1 transition amplitudes for N->delta (EMR) appears to be largely insensitive to differences between recent p(g,pi0) cross section measurements. We deduce a current best estimate of EMR = -(2.85 +/-0.34 +/-0.21)%. Back angle Compton cross sections require a value for the backward spin polarizability that is significantly lower than previous expectations, with a magnitude that is coupled to the (g,pi) cross sections.

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