Search for the isospin-violating decay D{sup *+}{sub s} {yields} D{sup +}{sub s}{pi}{degrees}

Using data collected with the CLEO II detector at the Cornell Electron-Positron Storage Ring (CESR) the authors have searched for the isospin-violating decay D{sup *+}{sub s} {yields} D{sup +}{sub s}{pi}{sup 0} in order to measure its branching ratio relative to the well-known radiative decay.