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Pion photoproduction in a gauge-invariant chiral unitary framework

Maxim Mai
(
- Bonn U., HISKP and
- Bonn U.
)
,
Peter C. Bruns
(
- Regensburg U.
)
,
Ulf-G. Meißner
(
- Julich, Forschungszentrum and
- IAS, Julich and
- JCHP, Julich
)

2014

Part of Proceedings, 9th International Workshop on the Physics of Excited Nucleons (NSTAR 2013) : Valencia, Spain, May 27-30, 2013

Published in:

Int.J.Mod.Phys.Conf.Ser. 26 (2014) 1460075

Contribution to:

- NSTAR 2013

Published: 2014

DOI:

10.1142/S2010194514600751

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Abstract: (WSP)

We investigate pion photoproduction off the proton in a manifestly gauge-invariant chiral unitary extension of chiral perturbation theory. In a first step, we consider meson-baryon scattering taking into account all next-to-leading order contact interactions. The resulting low-energy constants are determined by a fit to s-wave pion-nucleon scattering and the low-energy data for the reaction π-p → ηn. Having determined the low-energy constants, we then analyse the data on the s-wave multipole amplitudes E0+ of pion and eta photoproduction. These are parameter-free predictions, as the two new low-energy constants are determined by the neutron and proton magnetic moments.

12.39.Fe
13.75.Gx
13.75.Jz
14.20.Jn
Meson photoproduction
chiral unitary approach
meson-baryon scattering
pi: photoproduction
chiral
unitarity

References(22)

Figures(0)

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