B→η(′)(l-νl,l+l-,K,K*) decays in the quark-flavor mixing scheme

In the quark-flavor mixing scheme, eta and eta(') are linear combinations of flavor states eta(q)=(u (n) over bar +d (K) over bar)/(2) over bar and eta(s)=s (s) over bar with the masses of m(qq) and m(ss), respectively. Phenomenologically, m(ss) is strictly fixed to be around 0.69, which is close to 2m(K)(2)-m(pi)(2) by the approximate flavor symmetry, while m(qq) is found to be 0.18 +/- 0.08 GeV. For a large allowed value of m(qq), we show that the branching ratios (BRs) for B ->eta X-(') decays with X=(center dot(-)(nu) over bar (center dot),center dot(+)center dot(-)) are enhanced. We also illustrate that BR(B ->eta X)> BR(B ->eta X-') in the mechanism without the flavor-singlet contribution. Moreover, we demonstrate that the decay branching ratios for B ->eta K-(')([*]) are consistent with the data. In particular, the puzzle of the large BR(B ->eta K-') can be solved. In addition, we find that the CP asymmetry for B-+/-->eta K-+/- can be as large as -30%, which agrees well with the data. However, we cannot accommodate the CP asymmetries of B ->eta K-* in our analysis, which could indicate the existence of some new CP violating sources.