p¯pBackward Scattering ands-Channel Resonances: Upper Limit to thep¯pCoupling of theS(1929)Meson

From the energy dependence of the $\overline{p}p$ and $\overline{p}n$ inelastic cross sections we deduce an upper limit to the resonant contribution in $\overline{p}p$ backward scattering for c.m. energies between 1915 and 1950 MeV. This limit is smaller than the expected contribution from diffraction scattering. The energy dependence of the 180° $\overline{p}p$ elastic cross section in this energy range cannot therefore be directly related to the formation of $s$-channel resonances.