Weak Decay of $\hat{I}›$ in Nuclei : Quarks vs Mesons

Abstract

Decays of $\hat{I}›$ in nuclei, nonmesonic mode, are studied by using the $\hat{I}›N\to NN$ weak transition potential derived from the meson exchange mechanism and the direct quark mechanism. The decay rates are calculated both for the $\hat{I}›$ in symmetric nuclear matter and light hypernuclei. We consider the exchange of six mesons ($\ddot{I}€,K,\hat{I}\cdot ,\ddot{I},\ddot{I}‰,K^{\ast }$). The form factor in the meson exchange mechanism and short range correlation are carefully studied.

22 pages, 14 figures