We calculate the branching ratios and CP-violating asymmetries for $B_s^0 \to \pi^0 \eta^{ (\prime)}$ 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 $BR(B_s^0 \to \pi^0 \eta) \approx 0.86 \times 10^{ -7}$ and $BR(B_s^0 \to \pi^0 \eta') \approx 1.86 \times 10^{ -7}$. The pQCD predictions for the CP-violating asymmetries are $A_{ CP}^{ dir}(\pi^0 \eta)\sim -4.5 % $, $A_{ CP}^{ dir}(\pi^0 \eta')\sim -9.1% $, $A_{ CP}^{ mix}(\pi^0 \eta)\sim -0.2%$, and $A_{ CP}^{ mix}(\pi^0 \eta')\sim 27.0%$ 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.
Categories: hep-ph hep-ex