1. $D_s^{\ast} \to ϕ$ helicity form factors and the exclusive weak decays
- Author
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Cheng, Shan, Ju, Yao-hui, Qin, Qin, and Yu, Fu-sheng
- Subjects
High Energy Physics - Phenomenology (hep-ph) ,High Energy Physics::Lattice ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,High Energy Physics::Experiment - Abstract
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., 14 pages, 3 figure, 4 tables, matches version accepted for publication in EPJC
- Published
- 2022
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