Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-07-03
Phys.Rev.D77:054006,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
35 pages, 3 figs, discussion of the 3-body annihilation in hep-ph/0611356 and clarifying comments added
Scientific paper
10.1103/PhysRevD.77.054006
We classify LambdaQCD/mb power corrections to nonleptonic B-> M1 M2 decays, where M1 and M2 are charmless non-isosinglet mesons. Using recent developments in soft-collinear effective theory, we prove that the leading contributions to annihilation amplitudes of O[alphas(mb) LambdaQCD/mb] are real. The leading annihilation amplitudes depend on twist-2 and twist-3 three parton distributions. A complex nonperturbative parameter from annihilation first appears at O[alphas^2(sqrt{Lambda mb}) LambdaQCD/mb]. ``Chirally enhanced'' contributions are also factorizable and real at lowest order. Thus, incalculable strong phases are suppressed in annihilation amplitudes, unless the alphas(sqrt{Lambda mb}) expansion breaks down. Modeling the distribution functions, we find that (11 +- 9)% and (15 +- 11)% of the absolute value of the measured B-> K- pi+ and B-> K- K0 penguin amplitudes come from annihilation. This is consistent with the expected size of power corrections.
Arnesen Christian M.
Ligeti Zoltan
Rothstein Ira Z.
Stewart Iain W.
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