### Abstract

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 g_{A} and g_{V} 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.

Original language | English (US) |
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Pages (from-to) | 105-114 |

Number of pages | 10 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 593 |

Issue number | 1-4 |

DOIs | |

State | Published - Jul 22 2004 |

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

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## Cite this

Bernard, V., Gardner, S., Meißner, U. G., & Zhang, C. (2004). Radiative neutron β-decay in effective field theory.

*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*,*593*(1-4), 105-114. https://doi.org/10.1016/j.physletb.2004.04.064