Ds∗→ϕ helicity form factors and the exclusive weak decays.

The decay width of the D s ∗ meson is dominated by the electromagnetic mode D s ∗ → 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 ∗ → ϕ helicity form factors and discuss the experiment potential of discovering exclusive D s ∗ weak decays. The main result is the partial decay widths, which read as Γ D s ∗ → l ν = 2.44 × 10 - 12 GeV , Γ D s ∗ → ϕ l ν = (3. 28 - 0.71 + 0.82) × 10 - 14 GeV , Γ D s ∗ → ϕ π = (3. 81 - 1.33 + 1.52) × 10 - 14 GeV and Γ D s ∗ → ϕ ρ = (1. 16 - 0.39 + 0.42) × 10 - 13 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. [ABSTRACT FROM AUTHOR]