2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/202303Using data collected with the CLEO~II detector, we have observed the isospin-violating decay $D_s^{*+}\to D_s^+π^0$. The decay rate for this mode, relative to the dominant radiative decay, is found to be $Γ(D_s^{*+}\to D_s^+π^0)/Γ(D_s^{*+}\to D_s^+γ)= 0.062^{+0.020}_{-0.018}\pm0.022$.8 page uuencoded postscript file, also available through http://w4.lns.cornell.edu/public/CLNSHigh Energy Physics - Experimenttext