Probing new physics in B→J/ψπ0 decay

中国物理C, 2010, 34(11): 1680-1686.

^1, , ^2,

1.Department of Physics, Xuzhou Normal University, Xuzhou 221116, China

2.Institute of Physics, Jilin Normal University, Siping 136000, China

Probing new physics in B→J/ψπ0 decay

LI Jing-Wu ^1, , WU Xiang-Yao ^2,

1.Department of Physics, Xuzhou Normal University, Xuzhou 221116, China

2.Institute of Physics, Jilin Normal University, Siping 136000, China

Keywords： new physics

We calculate the branching ratio of B→J/ψπ0 with a mixed formalism that combines the QCD-improved factorization and the perturbative QCD approaches. The result is consistent with experimental data.The quite small penguin contribution in B→J/ψπ0 decay can be calculated with this method. We suggest two methods to extract the weak phase β. One is through the dependence of the mixing induced CP asymmetry SJ/ψπ0 on the weak phase β, the other is from the relation of the total asymmetry ACP with the weak phase β. Our results show that the deviation △SJ/ψπ0 of the mixing induced CP asymmetry from sin(-2β) is of O(10-3) and has much less uncertainty. The above O(10-3) deviation can provide a good reference for identifying new physics.

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Probing new physics in B→J/ψπ0 decay

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