Gauge symmetric delta(1232) couplings and the radiative muon capture in hydrogen

Details Gauge symmetric delta(1232) couplings and the radiative muon capture in hydrogen Gauge symmetric delta(1232) couplings and the radiative muon capture in hydrogen

2004-09-06

arxiv.org/abs/nucl-th/0409011v1

Phys.Rev. C72 (2005) 015501

Physics

Nuclear Physics

Nuclear Theory

9 pages, 3 figures

Scientific paper

10.1103/PhysRevC.72.015501

Using the difference between the gauge symmetric and standard pi-N-delta couplings, a contact pi-pi-N-N term, quadratic in the pi-N-delta coupling, is explicitly constructed. Besides, a contribution from the delta excitation mechanism to the photon spectrum for the radiative muon capture in hydrogen is derived from the gauge symmetric pi-N-delta and gamma-N-delta couplings. It is shown for the photon spectrum, studied recently experimentally, that the new spectrum is for the photon momentums k > 60 MeV by 4-10 % smaller than the one obtained from standardly used couplings with the on-shell deltas.

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