科研之友
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摘要
In the two-quark model supposition for K-0*(1430), which can be viewed as either the first excited state (scenario I) or the lowest lying state (scenario II), the branching ratios and the direct CP-violating asymmetries for decays (B) over bar (0)(s) -> K-0(*0) (1430)phi, K-0(*0)(1430)omega, K-0(*0)(1430)rho(0), K-0(*+)(1430)rho(-) are studied by employing the perturbative QCD factorization approach. We find the following results: (a) Enhanced by the color allowed tree amplitude with large Wilson coefficients a(1) = C-2 + C-1/3, the branching ratio of (B) over bar (0)(s) -> K-0(*+)(1430)rho(-) is much larger than those of the other three decays and arrives at (3.4(-0.7)(+0.8)) x 10(-5) in scenario I, even 10(-4) order in scenario II, and its direct CP-violating asymmetry is the smallest, around 10%, so this channel might be measurable in the current LHC-b experiments, where a large number (about 10(12)) of B mesons will be produced per year. These high statistics will make the measurement possible. (b) For the decay modes (B) over bar (0)(s) -> K-0(*0)(1430)omega, K-0(*0)(1430)rho(0), their direct CP-violating asymmetries are large, but it might be difficult to measure them, because their branching ratios are small and less than (or near) 10(-6) in both scenarios. For example, in scenario I, these values are B((B) over bar (0)(s) -> K-0(*0)(1430)omega) = (8.2(-1.7)(+1.8)) x 10(-7), B((B) over bar (0)(s) -> K-0*(1430)rho(0)) = (9.9(-2.0)(+2.1)) x 10(-7), A(CP)(dir)((B) over bar (0)(s) -> K-0(*0)(1430)omega) = -24.1(-2.5)(+2.8), A(CP)(dir)((B) over bar (0)(s) -> K-0(*0)(1430)rho(0)) = 26.6(-2.5)(+2.5) (c) For the decay (B) over bar (0)(s) -> K-0*(1430)phi, the predicted branching ratios are also small and a few times 10(-7) in both scenarios; there is no tree contribution at the leading order, so its direct CP-violating asymmetry is naturally zero.
- 出版日期2010-12-20
- 单位河南工业大学
