TY - JOUR
T1 - Radiative neutron β-decay in effective field theory
AU - Bernard, Véronique
AU - Gardner, Susan
AU - Meißner, Ulf G.
AU - Zhang, Chi
PY - 2004/7/22
Y1 - 2004/7/22
N2 - 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.
AB - 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.
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U2 - 10.1016/j.physletb.2004.04.064
DO - 10.1016/j.physletb.2004.04.064
M3 - Article
AN - SCOPUS:3242699426
VL - 593
SP - 105
EP - 114
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 1-4
ER -