Phys. Rev. C 52, 1986–1991 (1995)Comparing the p-wave multipoles for π0 photoproduction with low-energy predictionsReceived 27 March 1995; published in the issue dated October 1995 Recent estimates of the p-wave multipoles for p(γ,π0) near threshold [J. C. Bergstrom, Phys. Rev. C 50, 2979 (1994)] are compared with new low-energy theorems (LETs) derived from heavy-baryon chiral perturbation theory. Very good agreement is obtained with the LET for the combination M1+-M1-, but a marked discrepancy exists with the LET for E1+. Comparison is also made with an explicit (model-dependent) evaluation of the multipoles which incorporates the off-shell behavior of the Δ(1232) resonance in a generalized covariant form. Excellent agreement is observed for the multipole M1- including the isospin components, but again a substantial discrepancy exists with E1+. An experimental test of the conflicting E1+ results is suggested. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.52.1986
DOI:
10.1103/PhysRevC.52.1986
PACS:
25.20.Lj, 12.39.Fe, 13.60.Le
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