arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1406.2095hep-phhep-ex
收藏

光锋夸克模型中光矢量介子的半双轻子衰变

Semi-dileptonic decays of the light vector mesons in Light Front Quark Model

Chao-Qiang Geng, Chong-Chung Lih

摘要:

在光阵面夸克模型下,研究了动量转移$q^2$与光矢到赝标介子跃迁形状因子的关系。利用这些形状因子,我们计算了$V\to P\ell^+\ell^-$($V=ω$和$ϕ$,$P=π^0$,$η$和$η^{\prime}$以及$\ell=e$和$μ$)所有可能模式的衰变分支比。我们发现我们的计算结果与NA60计算的$ω\to π^0 \ell^+\ell^-$和$ϕ\to π^0 e^+e^-$以及SND计算的$ϕ\toηe^+e^-$的数据相吻合。我们还预测了$ϕ\to π^0 μ^+μ^-$、$ω\to ηe^+e^-$、$ω\to ημ^+μ^-$、$ϕ\to ημ^+μ^-$和$ϕ\to η^{\prime} e^+e^-$的分支比分别在$3.48\times 10^{-6}$、$3.22\times 10^{-6}$、$1.81\times 10^{-9}$、$6.86\times 10^{-6}$ $2.97\times 10^{-7}$附近。

英文摘要:

We study the transition form factors of the light vector to pseudoscalar mesons as functions of the momentum transfer $q^2$ within the light-front quark model. With these form factors, we calculate the decay branching ratios of all possible modes for $V\to P\ell^+\ell^-$ ($V=ω$ and $ϕ$, $P=π^0$, $η$ and $η^{\prime}$ and $\ell=e$ and $μ$). We find that our numerical results fit with the data, such as those of $ω\to π^0 \ell^+\ell^-$ and $ϕ\to π^0 e^+e^-$ by NA60 and $ϕ\toηe^+e^-$ by SND. We also predict that the branching ratios of $ϕ\to π^0 μ^+μ^-$, $ω\to ηe^+e^-$, $ω\to ημ^+μ^-$, $ϕ\to ημ^+μ^-$ and $ϕ\to η^{\prime} e^+e^-$ to be aroud $3.48\times 10^{-6}$, $3.22\times 10^{-6}$, $1.81\times 10^{-9}$, $6.86\times 10^{-6}$ $2.97\times 10^{-7}$, respectively.

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。

↑