T-odd momentum correlation in radiative β decay

Susan Gardner, Daheng He

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


We consider neutron radiative β decay, n→pe -ν ̄eγ, and compute the T-odd momentum correlation in the decay rate characterized by the kinematical variable ξ=l ν•(l e×k) arising from electromagnetic final-state interactions in the standard model. Our expression for the corresponding T-odd asymmetry AξSM is exact in O(α) up to terms of recoil order, and we evaluate it numerically under various kinematic conditions. Noting the universality of the V-A law in the absence of recoil-order terms, we retain the parametric dependence on masses and coupling constants throughout, so that our results serve as a template for the computation of AξSM in allowed nuclear radiative β decays and hyperon radiative β decays as well.

Original languageEnglish
Article number016003
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number1
StatePublished - Jul 6 2012

ASJC Scopus subject areas

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


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