Phenomenology of B -> pi pi, pi K Decays at O(alpha^2 beta_0) in QCD Factorization

Details Phenomenology of B -> pi pi, pi K Decays at O(alpha^2 beta_0) in QCD Factorization Phenomenology of B -> pi pi, pi K Decays at O(alpha^2 beta_0) in QCD Factorization

2005-04-04

arxiv.org/abs/hep-ph/0504024v3

Phys.Rev. D73 (2006) 114004

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, 5 figures. Updated input parameters and added citations; expanded discussion

Scientific paper

10.1103/PhysRevD.73.114004

We study O(alpha^2 beta_0) perturbative corrections to matrix elements entering two-body exclusive decays of the form B -> pi pi, pi K in the QCD factorization formalism, including chirally enhanced power corrections, and discuss the effect of these corrections on direct CP asymmetries, which receive their first contribution at O(alpha). We find that the O(alpha^2 beta_0) corrections are often as large as the O(alpha) corrections. We find large uncertainties due to renormalization scale dependence as well as poor knowledge of the non-perturbative parameters. We assess the effect of the perturbative corrections on the direct CP violation parameters of B -> pi^+ pi^-.

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