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We compute standard model penguin amplitudes in nonleptonic B-decays to lightcharmless mesons using tree amplitude data to fix hadronic parameters. Theleading calculation is carried out for the alphas(mb) penguin contributionsfrom charm quark, up quark, and magnetic penguin loops in the NDR and HVrenormalization schemes. Power suppressed penguins that are proportional to thechiral condensate are also computed using a new factorization formula for theseterms, which is derived working to all orders in alphas(sqrt{mb\Lambda}). Wedemonstrate using SCET1 that this formula exhibits only small perturbativephases and does not have endpoint singularities. Due to our use of data to fixhadronic parameters we obtain significantly more accurate predictions for theshort-distance standard model penguin amplitudes than have been found in thepast. Analyzing data in B-> pi pi, B->K pi, and B->rho rho for the penguinamplitudes we find that standard model short-distance imaginary parts are anorder of magnitude smaller than current measurements, while real parts are upto a factor of two smaller with the correct sign. This difference is mostlikely a consequence of long-distance charm contributions or new physics.Constraints on the type of new physics that could help explain the data arederived, and used to show that current data favors sizeable long-distancestrong phases.

Penguin Loops for Nonleptonic B-Decays in the Standard Model: Is there a Penguin Puzzle?