In the quark-flavor mixing scheme, η and η′ are linear combinations of flavor states ηq=(uū+dd̄)/2 and ηs=ss̄ with the masses of mqq and mss, respectively. Phenomenologically, mss is strictly fixed to be around 0.69, which is close to 2mK2-mπ2 by the approximate flavor symmetry, while mqq is found to be 0.18±0.08GeV. For a large allowed value of mqq, we show that the branching ratios (BRs) for B→η(′)X decays with X=(-ν̄,+-) are enhanced. We also illustrate that BR(B→ηX)>BR(B→η′X) in the mechanism without the flavor-singlet contribution. Moreover, we demonstrate that the decay branching ratios for B→η(′)K[*] are consistent with the data. In particular, the puzzle of the large BR(B→η′K) can be solved. In addition, we find that the CP asymmetry for B±→η K± can be as large as -30%, which agrees well with the data. However, we cannot accommodate the CP asymmetries of B→ηK* in our analysis, which could indicate the existence of some new CP violating sources.
|期刊||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|出版狀態||Published - 2007 三月 1|
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