Initial-state radiative and resolution corrections and resonance parameters in e+e- annihilation

The effects in e+e- annihilation of soft photon emission by the electrons and a finite energy spread on the shapes of resonant cross sections and determination of resonance parameters are treated in a simple coherent manner. The modification of the well-known area method for finding partial widths in the presence of appreciable radiative corrections is discussed in detail and illustrated. Experimental line shapes are expressed in terms of a radiatively corrected energy resolution function Gsub(R)(W-W'). Numerical values and an explicit functional approximation for Gsub(R) are given for a Gaussian distribution of beam energies. The emphasis is on narrow resonances such as the recently discovered stars at 3.1 and 3.7 GeV. (Auth.)