Chinese Physics C > 2006, Vol. 30 > Issue(6): 501-506

Probe the Strength of Annihilation In B_S→π^＋π^－Decays Within QCD Factorization

Department of Physics, Henan Normal University, Xinxiang 453007, China

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Abstract：
Using the method of QCD factorization, we calculate the branching ratio and the CP violation for pure annihilation decay B _S→π ^＋π ^－in the Standard Model. Meanwhile, we employ an effective gluon mass resulted in the study of the infrared behaviour of gluon propagators to avoid the soft endpoint divergence. We find that the CP-averaged branching ratio is about 1.24×10 ^－7, and the penguin diagram contributions is dominant in this process. The direct CP violation parameter is about －0.05, while the mixing-induced CP asymmetry is a quite large number of 0.18. Once these quantities can be measured in the future LHC-b experiments, studying such a process will enrich our knowledge on the dynamics of the charmless hadronic decay of B-meson and the property of gluon.

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LU Gong-Ru, SU Fang, YANG Ya-Dong and HAO Hong-Jun. Probe the Strength of Annihilation In B _S→π ^＋π ^－Decays Within QCD Factorization[J]. Chinese Physics C, 2006, 30(6): 501-506.

LU Gong-Ru, SU Fang, YANG Ya-Dong and HAO Hong-Jun. Probe the Strength of Annihilation In B _S→π ^＋π ^－Decays Within QCD Factorization[J]. Chinese Physics C, 2006, 30(6): 501-506. shu

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Received: 2005-07-25
Revised: 2006-01-21

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沈阳化工大学材料科学与工程学院沈阳 110142

Probe the Strength of Annihilation In B_S→π^＋π^－Decays Within QCD Factorization

Corresponding author:SU Fang,

Department of Physics, Henan Normal University, Xinxiang 453007, China

Received Date:2005-07-25
Accepted Date:2006-01-21
Available Online:2006-06-05

Abstract:Using the method of QCD factorization, we calculate the branching ratio and the CP violation for pure annihilation decay B_S→π^＋π^－in the Standard Model. Meanwhile, we employ an effective gluon mass resulted in the study of the infrared behaviour of gluon propagators to avoid the soft endpoint divergence. We find that the CP-averaged branching ratio is about 1.24×10^－7, and the penguin diagram contributions is dominant in this process. The direct CP violation parameter is about －0.05, while the mixing-induced CP asymmetry is a quite large number of 0.18. Once these quantities can be measured in the future LHC-b experiments, studying such a process will enrich our knowledge on the dynamics of the charmless hadronic decay of B-meson and the property of gluon.