Penguin operators in nonresonant B--> M(M)over-bar pi(-) (M = pi-, K-, K-0) decays - art. no. 054029

We investigate the contributions coming from the penguin operators in the n onresonant B--->M (M) over bar pi(-) (M = pi(-),K-,K-0) decays. The effecti ve Wilson coefficients of the strong penguin operators O-4 and O-6 are foun d to be relatively larger than those for other penguin operators. We calcul ate the contributions arising from the O-4 and O-6 operators in the nonreso nant decays B--->M (M) over bar pi(-) (M = pi-,K-,(K) over bar(0)) using a model combining heavy quark symmetry and the chiral symmetry, developed pre viously. We find that the CKM-forbidden nonresonant B--->K-0(K) over bar(0) pi(-) decay occurs through the strong penguin operators. These penguin cont ributions affect the branching ratios for B--->M (M) over bar pi(-) (M=pi(- ),K-) by only a few percent. The branching ratio for B--->K-0(K) over bar(0 )pi(-) is estimated to be of the order 10(-6). [S0556-2821(99)07613-4].