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Chiral corrections to the Kroll-Ruderman theorem

1996; Elsevier BV; Volume: 383; Issue: 1 Linguagem: Inglês

10.1016/0370-2693(96)00699-5

ISSN

1873-2445

Autores

Véronique Bernard, Norbert Kaiser, Ulf-G. Meißner,

Tópico(s)

Nuclear physics research studies

Resumo

We calculate the one-loop corrections to the Kroll-Ruderman low-energy theorems for charged pion photoproduction in the framework of heavy baryon chiral perturbation theory. We predict the threshold S-wave multipole E0+ to be E0+thr (γp → π+ n) = (28.2 ± 0.6) · 10−3/Mπ and E0+thr (γn → π−p) = (−32.7 ± 0.6) · 10−3/Mπ, respectively, for a fixed pion-nucleon coupling constant, gπN = 13.4. A comparison to the existing data is also given.

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