Radiative β decay for studies of CP violation

Susan Gardner, Daheng He

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


A triple-product correlation in the radiative β decay rate of neutrons or of nuclei, characterized by the kinematical variable ξ≡(l ν×le)·k, where, e.g., n(p)→p(p )+e-(le)+ν̄e(l ν)+γ(k), can be generated by the pseudo-Chern-Simons term found by Harvey, Hill, and Hill as a consequence of the baryon vector current anomaly and SU(2)L×U(1)Y gauge invariance at low energies. The correlation probes the imaginary part of its coupling constant, so that its observation at anticipated levels of sensitivity would reflect the presence of sources of CP violation beyond the standard model. We compute the size of the asymmetry in n→pe-ν̄eγ decay in chiral effective theory, compare it with the computed background from standard-model final-state interactions, and consider the new physics scenarios which would be limited by its experimental study.

Original languageEnglish
Article number116012
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number11
StatePublished - Jun 24 2013

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Radiative β decay for studies of CP violation'. Together they form a unique fingerprint.

Cite this