Induced second-class form factors in Σ − β decay
1986; American Physical Society; Volume: 33; Issue: 5 Linguagem: Inglês
10.1103/physrevd.33.1356
ISSN1538-4500
AutoresL. Carson, R. J. Oakes, Charles R. Willcox,
Tópico(s)Neutrino Physics Research
ResumoA study of induced second-class currents emerging as a consequence of broken SU(3) flavor symmetry in ${\ensuremath{\Sigma}}^{\mathrm{\ensuremath{-}}}$ \ensuremath{\beta} decay is presented. Working within the framework of the MIT bag model, all form factors describing the ${\ensuremath{\Sigma}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}n weak transition are calculated, including QCD vertex corrections to order ${\ensuremath{\alpha}}_{s}$. It is found that the weak-electric dipole form factor ${g}_{2}$ is suppressed by confinement effects to be approximately -0.1. This is shown to have a negligible effect on the electron asymmetry ${\ensuremath{\alpha}}_{e}$, and hence strengthens the case that recent data for ${\ensuremath{\alpha}}_{e}$ in ${\ensuremath{\Sigma}}^{\mathrm{\ensuremath{-}}}$ \ensuremath{\beta} decay are consistent with Cabibbo-model predictions.
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