Radiative neutron beta-decay in effective field theory

Details Radiative neutron beta-decay in effective field theory Radiative neutron beta-decay in effective field theory

2004-03-22

arxiv.org/abs/hep-ph/0403241v2

Phys.Lett. B593 (2004) 105-114; Erratum-ibid. B599 (2004) 348-348

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 4 eps figures, misprints fixed, to appear in Phys Lett B

Scientific paper

10.1016/j.physletb.2004.08.041

We consider radiative \beta--decay of the neutron in heavy baryon chiral perturbation theory, with an extension including explicit \Delta degrees of freedom. We compute the photon energy spectrum as well as the photon polarization; both observables are dominated by the electron bremsstrahlung contribution. Nucleon-structure effects not encoded in the weak coupling constants g_A and g_V are determined at next-to-leading order in the chiral expansion, and enter at the {\cal O}(0.5%)-level, making a sensitive test of the Dirac structure of the weak currents possible.

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