Radiative neutron beta-decay in effective field theory
High Energy Physics - Phenomenology
2014-11-17 v2 High Energy Physics - Experiment
Nuclear Experiment
Nuclear Theory
Abstract
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.
Cite
@article{arxiv.hep-ph/0403241,
title = {Radiative neutron beta-decay in effective field theory},
author = {V. Bernard and S. Gardner and U. -G. Meißner and C. Zhang},
journal= {arXiv preprint arXiv:hep-ph/0403241},
year = {2014}
}
Comments
11 pages, 4 eps figures, misprints fixed, to appear in Phys Lett B