Weak $\Lam N\to NN$ Transition in the Direct Quark Mechanism
Abstract
The weak $\Lam N\to NN$ transition is studied in the valence quark model approach. The momentum transfer for this transition is so large that the shortdistance two baryon dynamics must be taken into account. The two baryon system is described in the quark cluster model and the weak transition amplitude is calculated by evaluating the matrix elements of the effective weak $\Delta S= 1$ hamiltonian. The results indicate some qualitative differences when compared with those in conventional mesonexchange calculations. Especially, we conclude that contributions of the $\Delta I={3\over2}$ transition are significant and that the discrepancy in the $np$ ratio between theory and experiment could be resolved by including the directquark processes.
 Publication:

arXiv eprints
 Pub Date:
 December 1993
 arXiv:
 arXiv:hepph/9312216
 Bibcode:
 1993hep.ph...12216I
 Keywords:

 High Energy Physics  Phenomenology;
 Nuclear Theory
 EPrint:
 15 pp. no figure, Talk presented by M.~Oka at {\sl the JSPSNSF Joint Seminar on "Hyperon Nucleon Interactions", Maui, HI, October, 1993