Neutral meson photoproduction in SU{sub {ital f}}(3) chiral perturbation theory: {gamma}{ital N}{r_arrow}{pi}{sup 0}{ital N}
- Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)
We present the results for the electric dipole amplitude for {gamma}{ital N}{r_arrow}{pi}{sup 0}{ital N} at threshold at the {ital O}({ital p}{sup 2}) level in SU{sub {ital f}}(3) chiral perturbation theory. We find that the SU{sub {ital f}}(3) results differ only slightly from the SU{sub {ital f}}(2) results. At the {ital O}({ital p}{sup 3}) level one encounters new, unknown counterterms to fix which one is likely to need the threshold photoproduction data themselves, thus, losing predictive power. We suggest, instead, that the {ital difference} between the proton and neutron {pi}{sup 0} photoproduction amplitudes may provide a test of the convergence properties of {chi}PT in the present context. We urge that the neutron{close_quote}s electric dipole amplitude be measured. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Univ. of Maryland, College Park, MD (United States)
- DOE Contract Number:
- FG02-93ER40762
- OSTI ID:
- 286089
- Journal Information:
- Physical Review, D, Vol. 54, Issue 1; Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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