Probing new physics in $B\to J/\Psi {\pi }^0$ decay

Abstract

We calculate the branching ratio of $B\to J/\Psi {\pi }^0$ 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 $B\to J/\Psi {\pi }^0$ decay can be calculated with this method. We suggest two methods to extract the weak phase $\beta$. One is through the dependence of the mixing induced CP asymmetry $S_{J/\Psi {\pi }^0}$ on the weak phase$\beta$, the other is from the relation of the total asymmetry $A_{CP}$ with the weak phase $\beta$. Our result shows that the deviation $△S_{J/\psi {\pi }^0}$ of the mixing induced CP asymmetry from $Sin(-2\beta )$ is of $\mathcal{O}(10^{-3})$ and has much less uncertainty. The above $\mathcal{O}(10^{-3})$ deviation can provide a good reference for identifying new physics.

Comments: 12page,5figures