Radiative neutron beta-decay in effective field theory
arXiv:hep-ph/0403241 · doi:10.1016/j.physletb.2004.04.064
Abstract
We consider radiative β--decay of the neutron in heavy baryon chiral perturbation theory, with an extension including explicit Δdegrees 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.
11 pages, 4 eps figures, misprints fixed, to appear in Phys Lett B
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