Chiral symmetry and the reaction $γp \to π^0 p$

Details Chiral symmetry and the reaction $γp \to π^0 p$ Chiral symmetry and the reaction $γp \to π^0 p$

1995-12-05

arxiv.org/abs/hep-ph/9512234v1

Phys.Lett. B378 (1996) 337-341

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pp, LaTeX/ReVTeX file, 3 figures (in a separate compressed tar files in pi0fig.uu)

Scientific paper

10.1016/0370-2693(96)00356-5

We analyze the new threshold data for neutral pion photoproduction off protons in the framework of heavy baryon chiral perturbation theory. We show that large loop corrections are needed to understand the S--wave multipole $E_{0+}$ and that all pertinent low--energy constants can be understood within the framework of resonance exchange saturation. Previous inconsistencies in the description of this reaction in the threshold region are resolved.

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