Abstract
A detailed description is developed for the invariant dipion mass distribution in the reaction πp → ππN. Based on OPEM and modified phenomenologically this “generalized Breit-Wigner” formula accounts for peripheral production, t-dependence of the ϱ parameters, skewness of the ϱ peak, energy dependence of the ϱ width, energ-dependent departure from OPEM, background, and background interference. Contributions from other ππ partial waves are included and the possibility of ϱ being a CDD pole considered. The formula is used on a data compilation of large statistics and conclusions concerning the presence of the various terms and the ϱ parameters are reached. Finally, we compare the width of the pion-produced ϱ meson with the width of the e +e − produced ϱ meson.
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