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arXiv 1001.0939hep-ph
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QCD求和规则下半轻子$B$到$K_1(1270,1400)$的衰变

The Semileptonic $B$ to $K_1(1270,1400)$ Decays in QCD Sum Rules

H. Dag, A. Ozpineci, M. T. Zeyrek

摘要:

我们分析了$B$介子到$K_{1} (1270)$和$K_{1} (1400)$轴矢量介子的半轻子稀有衰变。$B\to K_{1} (1270,1400) \ell^+ \ell^-$衰变是$B$介子的重要的变味中性流衰变。这些衰变对SM之外的新物理很敏感,因为这些过程在SM的树级上是被禁止的。这些通过$b\to s \ell^+ \ell^- $跃迁发生在夸克能级上的衰变也为计算CKM矩阵元$V_{bt}$和$V_{ts}$提供了新的机会。本文用三点QCD求和规则方法计算了$B\to K_{1} (1270,1400) \ell^+ \ell^-$衰变的跃迁形状因子。由此产生的形状因子被用来估计这些衰变的分支分数。

英文摘要:

We analyze the semileptonic rare decays of $B$ meson to $K_{1} (1270)$ and $K_{1} (1400)$ axial vector mesons. The $B\to K_{1} (1270,1400) \ell^+ \ell^-$ decays are significant flavor changing neutral current decays of the $B$ meson. These decays are sensitive to the new physics beyond SM, since these processes are forbidden at tree level at SM. These decays occurring at the quark level via $b\to s \ell^+ \ell^- $ transition, also provide new opportunities for calculating the CKM matrix elements $V_{bt}$ and $V_{ts}$. In this study, the transition form factors of the $B\to K_{1} (1270,1400) \ell^+ \ell^-$ decays are calculated using three-point QCD sum rules approach. The resulting form factors are used to estimate the branching fractions of these decays.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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