Radiative neutron β-decay in effective field theory

Véronique Bernard; Susan Gardner; Ulf G. Meißner; Chi Zhang

doi:10.1016/j.physletb.2004.04.064

Radiative neutron β-decay in effective field theory

Véronique Bernard, Susan Gardner, Ulf G. Meißner, Chi Zhang

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31 Scopus citations

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
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	https://doi.org/10.1016/j.physletb.2004.04.064
State	Published - Jul 22 2004

Bibliographical note

Funding 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. [24] prior to publication and thank Gudrun Hiller for a discussion of the work in Ref. [28] . 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

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10.1016/j.physletb.2004.04.064

Cite this

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title = "Radiative neutron β-decay in effective field theory",

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 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.",

author = "V{\'e}ronique Bernard and Susan Gardner and Mei{\ss}ner, {Ulf G.} and Chi Zhang",

note = "Funding 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. [24] prior to publication and thank Gudrun Hiller for a discussion of the work in Ref. [28] . 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.",

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AU - Bernard, Véronique

AU - Gardner, Susan

AU - Meißner, Ulf G.

AU - Zhang, Chi

N1 - Funding 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. [24] prior to publication and thank Gudrun Hiller for a discussion of the work in Ref. [28] . 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.

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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Radiative neutron β-decay in effective field theory

Abstract

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