GLUON DIPOLE PENGUIN CONTRIBUTIONS TO EPSILON'-EPSILON AND CP VIOLATION IN HYPERON DECAYS IN THE STANDARD MODEL

We consider the gluon dipole penguin operator contributions to epsilon '/epsilon and CP violation in hyperon decays. It has been proposed by Bertolini et al. that the contribution to epsilon'/epsilon may be sign ificant. We show that there is a cancellation in the leading order con tribution and this contribution is actually suppressed by a factor of order O(m(pi)2, m(K)2)/LAMBDA2. We find that the same operator also co ntributes to CP violation in hyperon decays where it is not suppressed . The gluon dipole penguin operator can enhance CP violation in hypero n decays by as much as 25%.