Measurement of the absolute branching fraction of Ds0*(2317)±→π0Ds±

The process e ⁺e ^- → $D_s^{\ast }$${}^{+}$$D_{s0}^{\ast }(2317{)}^{-}+c.c.$ is observed for the first time with the data sample of 567 pb ^-1 collected with the BESIII detector operating at the BEPCII collider at a center-of-mass energy ps = 4.6 GeV. The statistical significance of the $D_{s0}^{\ast }(2317{)}^{\text{±}}$ signal is 5.8 and the mass is measured to be (2318.3 ± 1.2 ± 1.2) MeV/c ². The absolute branching fraction B($D_{s0}^{\ast }$$(2317{)}^{\text{Â}}\text{±}\text{â}\text{†}\text{’}\text{Ï}{\text{€}}^0$$D_s^{\text{±}}$) is measured as ${1.00}_{-0.14}^{+0.00}$$\left(stat\right)$${}_{-0.14}^{+0.00}$(syst) for the first time. The uncertainties are statistical and systematic, respectively.