Abstract
Multipole analyses of the p(γ, π°), p(γ, π+) and p(γ, γ) reactions are carried out using different data sets. With sufficient constraints from polarization observables, the ratio of E2/M1 transition amplitudes for N → Δ (EMR) appears to be largely insensitive to differences between recent p(γ, π°) 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 δπ that is significantly lower than previous expectations, with a magnitude that is coupled to the (γ, π) cross sections.
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Sandorfi, A.M., Hoblit, S., Tonnison, J. (1999). Multipole Analyses for p(γ, π) and p(γ, γ) in the Region of the P 33 Δ Resonance. In: Simula, S., Saghai, B., Mukhopadhyay, N.C., Burkert, V.D. (eds) N* Physics and Nonperturbative Quantum Chromodynamics. Few-Body Systems, vol 11. Springer, Vienna. https://doi.org/10.1007/978-3-7091-6800-4_25
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DOI: https://doi.org/10.1007/978-3-7091-6800-4_25
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