We consider radiative β-decay of the neutron in heavy baryon chiral perturbation theory, with an extension including explicit Δ 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 gA and gV are determined at next-to-leading order in the chiral expansion, and enter at the O(0.5%)-level, making a sensitive test of the Dirac structure of the weak currents possible.
|Number of pages||10|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Jul 22 2004|
Bibliographical noteFunding Information:
The work of S.G. is supported in part by the US Department of Energy under contract number DE-FG02-96ER40989. We are grateful to Fred Myhrer for providing us with a draft of Ref.  prior to publication and thank Gudrun Hiller for a discussion of the work in Ref.  . We also thank the members of the Fundamental Neutron Physics Program in the Ionizing Radiation Division of the National Institute of Science and Technology for a discussion of the experimental possibilities.
ASJC Scopus subject areas
- Nuclear and High Energy Physics