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arXiv 0805.2802hep-ph
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半轻子$B_{s}(B^{\pm})(B^{0})\to D_{s}[1968](D^{0})(D^{\pm}) lν$衰变的QCD求和规则研究

QCD Sum Rules Study of the Semileptonic $B_{s}(B^{\pm})(B^{0})\to D_{s}[1968](D^{0})(D^{\pm}) lν$ Decays

K. Azizi

备注：
19 Pages, 4 Figures and 3 Tables
发表信息：
Nucl.Phys.B801:70-80,2008
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摘要：

在三点QCD求和规则框架下计算了具有$q=s, u, d$跃迁的半轻子$B_{q}\to D_{q}(J^{P}=0^{-})\ellν$的形状因子.使用相关形状因子的$q^2$依赖性，还评估了这些衰减的总衰减宽度和分支比。在重夸克有效理论和零反冲极限下，将我们对$B\to D\ellν$的形状因子的计算结果与格点QCD预言进行了比较。分支比的计算结果与组分夸克介子模型（$q=s, u, d$）和实验（$q= u, d$）符合得很好. $B_{s}\to D_{s}(1968)\ellν$的分支比结果表明，在不久的将来，在LHC上也可以探测到这种跃迁。

英文摘要：

The form factors of the semileptonic $B_{q}\to D_{q}(J^{P}=0^{-})\ellν$ with $q=s, u, d$ transitions are calculated in the framework of three point QCD sum rules. Using the $q^2$ dependencies of the relevant form factors, the total decay width and the branching ratio for these decays are also evaluated. A comparison of our results for the form factors of $B\to D\ellν$ with the lattice QCD predictions within heavy quark effective theory and zero recoil limit is presented. Our results of the branching ratio are in good agreement with the constituent quark meson model for ($q=s, u, d$) and experiment for ($q= u, d$). The result of branching ratio for $B_{s}\to D_{s}(1968)\ellν$ indicates that this transition can also be detected at LHC in the near future.

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