arXiv 1004.44262010-04-26hep-ph

从$B \to f_0(980)K^*$衰变研究标量介子$f_0(980)$

Study of scalar meson $f_0(980)$ from $B \to f_0(980)K^*$ Decays

Zhi-Qing Zhang, Jun-De Zhang

备注：: 15 pages, 5 figures. Version accepted for publication in Eur.Phys.J.C.
发表信息：: Eur. Phys. J. C67:163-172, 2010

摘要：

本文利用微扰QCD因子化方法研究了衰变$\bar B^0\to f_0(980)\bar K^{*0}$和$B^-\to f_0(980)K^{*-}$的分支比和直接CP破坏不对称性。在双夸克模型假设中，$f_0(980)$通常被看作是$s\bar{s}$和$n\bar{n}(\equiv(u\bar{u}+d\bar{d})/\sqrt{2})$的混合物，即$|f_0(980)\ra = |s\bar s\ra\cosθ+|n\bar n\ra\sinθ$，其中$θ$是$f_0-σ$混合角.我们发现不可因式分解的$f_0$发射类型图对最终结果有很大的贡献，这与目前的实验数据和允许的混合角范围内的上限是一致的。我们预测，直接CP不对称${\cal A}^{dir}_{CP}(f_0(980)\bar K^{*0})$是小的，只有百分之几，这可以通过未来的B工厂实验进行测试。

英文摘要：

In this paper, the branching ratios and the direct CP-violating asymmetries for decays $\bar B^0\to f_0(980)\bar K^{*0}$ and $B^-\to f_0(980)K^{*-}$ by employing the perturbative QCD factorization approach are studied. In the two-quark model supposition, $f_0(980)$ is commonly viewed as a mixture of $s\bar{s}$ and $n\bar{n}(\equiv(u\bar{u}+d\bar{d})/\sqrt{2})$, that is $|f_0(980)\ra = |s\bar s\ra\cosθ+|n\bar n\ra\sinθ$, where $θ$ is the $f_0-σ$ mixing angle. We find that the non-factorizable $f_0$ emission type diagrams can give large contributions to the final results, which are consistent with the present experimental data and the upper limit in the allowed mixing angle ranges. We predict that the direct CP asymmetry ${\cal A}^{dir}_{CP}(f_0(980)\bar K^{*0})$ is small, only a few percent, which can be tested by future B factory experiments.

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摘要：

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