Importance of dipole penguin operator in B decays

The importance of dipole penguin operator, O-11 = (g(s)/8 pi(2))<m(b)(s)over bar sigma>(mu nu)RT(a)bG(a)(mu nu), on B decays is demonstrated. It is shown that branching ratios for the inclusive decay b --> ss(s) over bar, the semi-inclusive decay b --> s phi, and the exclusive decay B --> pi K are enhanced by 20% to 30%. A useful consequence of the calculation is the inclusive b --> ss(s) over bar spectrum which will be essential in isolating pure penguin process.