Influence of charming penguins on the extraction of gamma in B->PP decays

Abstract

Charmless B->PP decays are studied using flavor SU(3) symmetry. Amplitude with charming penguin topology is considered for two cases: with zero and with arbitrary strong phase. Two sets of data (an older and the most recent one) are used in the fits, so that the stability of the fits is tested. It is shown that within the present uncertainties in the data the parameters of the fit may be significantly modified, especially the gamma angle. The fits indicate the strong phase of the charming penguin amplitude to be around $\pm 20^{o}$.