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

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

2006-06-16

arxiv.org/abs/hep-ph/0606177v1

Phys.Rev.D75:034017,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages 3 eps figures

Scientific paper

10.1103/PhysRevD.75.034017

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.

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