Elusive ‘‘penguin’’ mechanism forKdecay

We observe that the uncertainty in estimating the ‘‘penguin’’ diagram is so large that its contribution to A(K→2π) can range from 30% to negligible, and thus no meaningful lower bound can be set for ε’/ε. We then map out the relations between the experimental measurements of ε’/ε and $m_t$ and the hadronic dynamical parameters for use in the search for the ‘‘penguin.’’