Branching Ratio and CP Asymmetry of $B_s \to π^0 η^{(\prime)}$ Decays in the perturbative QCD Approach

Abstract

We calculate the branching ratios and CP-violating asymmetries for $B_s^0 \to π^0 η^{(\prime)}$ decays in the perturbative QCD (pQCD) factorization approach here. We not only calculate the usual factorizable contributions, but also evaluate the non-factorizable and annihilation type contributions. The pQCD predictions for the CP-averaged branching ratios are $BR(B_s^0 \to π^0 η) \approx 0.86 \times 10^{-7}$ and $BR(B_s^0 \to π^0 η') \approx 1.86 \times 10^{-7}$. The pQCD predictions for the CP-violating asymmetries are $A_{CP}^{dir}(π^0 η)\sim -4.5 % $, $A_{CP}^{dir}(π^0 η')\sim -9.1% $, $A_{CP}^{mix}(π^0 η)\sim -0.2%$, and $A_{CP}^{mix}(π^0 η')\sim 27.0%$ but with large errors. The above pQCD predictions can be tested in the near future LHC-b experiments at CERN and the BTeV experiments at Fermilab.