论文标题
$ d_s^{\ ast} \ to ϕ $螺旋形式和独家弱衰减
$D_s^{\ast} \to ϕ$ helicity form factors and the exclusive weak decays
论文作者
论文摘要
$ d_s^{\ ast} $梅森的衰减宽度由电磁模式$ d_s^\ ast \ tod_sγ$主导，因此它是寿命最长的带电矢量梅森。鉴于这一点，我们执行了$ d_s^{\ ast} \ $ d_s^{\ ast} \的第一个QCD LCSRS计算到ϕ $ helicity formal formals sourde sourcation sourde sourcation sourde sourcation tormals formage tosly的实验潜力。主要结果是部分衰减宽度，其读为$γ_{d_s^\ ast \ tolν} = 2.44 \ times 10^{ - 12} \，{\ rm gev} $，$γ__s{ \ times 10^{ - 14} \，{\ rm gev} $，$γ_{d_s^{\ ast} \ to ϕπ} =（3.81^{+1.52} _ { - 1.33}） $γ_{d_s^{\ ast} \ to ϕρ} =（1.16^{+0.42} _ { - 0.39}）\ times 10^{ - 13} \，{\ rm gev} $。我们表明，这些渠道在不久的将来是有希望的，它是对媒介介子弱衰变的第一个实验性观察，并将为标准模型的精确测试打开一个新的操场。
The decay width of the $D_s^{\ast}$ meson is dominated by the electromagnetic mode $D_s^\ast \to D_s γ$, and it is thus the longest-lived charged vector meson. In light of this point, we perform the first QCD LCSRs calculation of $D_s^{\ast}\to ϕ$ helicity form factors and discuss the experiment potential of discovering exclusive $D_s^{\ast}$ weak decays. The main result is the partial decay widths, which read as $Γ_{D_s^\ast \to l ν} = 2.44 \times 10^{-12} \, {\rm GeV}$, $Γ_{D_s^\ast \to ϕl ν} = (3.28^{+0.82}_{-0.71}) \times 10^{-14} \, {\rm GeV}$, $Γ_{D_s^{\ast} \to ϕπ} = ( 3.81^{+1.52}_{-1.33} ) \times 10^{-14} \, {\rm GeV}$ and $Γ_{D_s^{\ast}\to ϕρ} = ( 1.16^{+0.42}_{-0.39} ) \times 10^{-13} \, {\rm GeV}$. We show that these channels are promising in the near future, serving as the first experimental observation of weak decays of a vector meson, and would open up a new playground for precision test of the standard model.
