Study ofωproduction near threshold in the reactionπ−p→ωn

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Abstract

We have investigated $\ensuremath{\omega}$ production in the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}\ensuremath{\omega}n$ very close to threshold. The dependence of the mass, width, branching ratio, and cross section upon the final-state c.m. momentum, ${P}^{*}$, were studied. The mass and width were independent of ${P}^{*}$ with values of 782.4 \ifmmode\pm\else\textpm\fi{} 0.5 and 10.22 \ifmmode\pm\else\textpm\fi{} 0.43 MeV, respectively. The branching ratio $\frac{\ensuremath{\Gamma}(\ensuremath{\omega}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}\ensuremath{\gamma})}{\ensuremath{\Gamma}(\ensuremath{\omega}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0})}$ was also constant, having a value of 0.084 \ifmmode\pm\else\textpm\fi{} 0.013. An upper limit of 0.18 was set on the branching ratio $\frac{\ensuremath{\Gamma}(\ensuremath{\omega}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma})}{\ensuremath{\Gamma}(\ensuremath{\omega}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}\ensuremath{\gamma})}$. We observed a rapid fall in the cross section below ${P}^{*}=100$ MeV/c. This could not be explained in terms of $S$-wave production alone, but could be fitted by a resonant $P$ wave plus a noninterfering $S$ wave.

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