On baryon semileptonic decays

Abstract

We make comments on baryon semileptonic decays motivated by recent work on quark models. We find the decay rate of ${\ensuremath{\Lambda}}_{c}\ensuremath{\rightarrow}\ensuremath{\Lambda}\overline{e}\ensuremath{\nu}$ to be reduced by a factor of 2 from its naive value due to wave-function distortion and form-factor effects. Configuration mixing implies the value of \ifmmode\pm\else\textpm\fi{}0.04 for the vector-to-axial-vector ratio in ${\ensuremath{\Sigma}}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}\ensuremath{\Lambda}\ensuremath{\beta}$ decay. Small changes in S${\mathrm{U}}_{6}$ predictions due to configuration mixing are also discussed. The Appendix describes a very simple method of evaluation of the axial-vector-to-vector ratio in the symmetric quark model with static quarks.