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 gamma, 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* -> phi 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 Gamma(Ds* -> l nu) = 2.44 x 10(-12) GeV, Gamma(Ds*->phi l nu) =(3.28(-0.71)(+)(0.82)) x 10(-14)GeV, Gamma(Ds*-> phi pi) = (3.81(-1.33)(+1.52)) x 10(-14) GeV and Gamma(Ds* ->phi rho)=(1.16(-0.39)(+)(0.42)) x 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.

Automated summary

This study calculates the QCD LCSRs of D-s*->phi helicity form factors and discusses the potential of discovering exclusive D-s* weak decays. The results show that these channels are promising for the first experimental observation of weak decays of a vector meson, providing a new playground for precision test of the standard model.