Penguin Diagram and the Process omega Implies xi gamma

摘要

It is pointed out that the ''penguin''-contribution is the only part of the standard delta S=1 weak Hamiltonian which contributes to the decay modes omega exp - implies xi exp - gamma and xi exp - implies sigma exp - gamma . These decay modes could therefore potentially be good tests of the coefficients of the ''penguin' operators. Matrix elements of the weak Hamiltonian between baryon states are estimated within a quark model (mainly the bag model). The theoretical predictions for the branching ratios are found to be uncertain. But the analysis indicates that Br( omega exp - implies xi exp - gamma ) approximately 10 exp -5 to 10 exp -4 and Br( xi exp - implies sigma exp - gamma ) approximately 10 exp -6 to 10 exp -5 . (Atomindex citation 12:640172)