Branching Ratio and CP Violation of B to pi pi Decays in Perturbative QCD Approach

Details Branching Ratio and CP Violation of B to pi pi Decays in Perturbative QCD Approach Branching Ratio and CP Violation of B to pi pi Decays in Perturbative QCD Approach

2000-04-24

arxiv.org/abs/hep-ph/0004213v3

Phys.Rev. D63 (2001) 074009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 28 pages including 11 figures; added contents and figures, corrected typos

Scientific paper

10.1103/PhysRevD.63.074009

We calculate the branching ratios and CP asymmetries for B^0 to pi^+pi^-, B^+ to pi^+pi^0 and B^0 to pi^0pi^0 decays, in a perturbative QCD approach. In this approach, we calculate non-factorizable and annihilation type contributions, in addition to the usual factorizable contributions. We found that the annihilation diagram contributions are not very small as previous argument. Our result is in agreement with the measured branching ratio of B to pi^+pi^- by CLEO collaboration. With a non-negligible contribution from annihilation diagrams and a large strong phase, we predict a large direct CP asymmetry in B^0 to pi^+pi^-, and pi^0pi^0, which can be tested by the current running B factories.

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