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arXiv 0804.0907hep-ph
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用光锥QCD求和规则分析$B\to a_1(1260)$形状因子

Analysis of the $B\to a_1(1260)$ form-factors with light-cone QCD sum rules

Zhi-Gang Wang

摘要:

本文用$B$ -介子光锥QCD求和规则计算了$B\to a_1(1260)$的形状因子$V_1(q^2)$、$V_2(q^2)$、$V_3(q^2)$和$A(q^2)$。这些形状因子是研究非轻子二体衰变$B\to AP$和半轻子衰变$B\to A l ν_l$、$B\to A \bar{l}l$的基本参数。我们的数值结果与(光锥)QCD求和规则的结果一致。主要的不确定性来自于参数$ω_0$(或$λ_B$),它决定了$B$介子的二粒子和三粒子光锥分布振幅的形状,对该参数的精化具有重要意义。

英文摘要:

In this article, we calculate the $B\to a_1(1260)$ form-factors $V_1(q^2)$, $V_2(q^2)$, $V_3(q^2)$ and $A(q^2)$ with the $B$-meson light-cone QCD sum rules. Those form-factors are basic parameters in studying the exclusive non-leptonic two-body decays $B\to AP$ and semi-leptonic decays $B\to A l ν_l$, $B\to A \bar{l}l$. Our numerical results are consistent with the values from the (light-cone) QCD sum rules. The main uncertainty comes from the parameter $ω_0$ (or $λ_B$), which determines the shapes of the two-particle and three-particle light-cone distribution amplitudes of the $B$ meson, it is of great importance to refine this parameter.

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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