Study of the Reactionspp¯→YY¯by Regge-Pole Exchange Model

The reactions $p\overline{p}\to \Lambda \overline{\Lambda }$, $p\overline{p}\to (\Lambda {\overline{\Sigma }}^{\circ }+\overline{\Lambda }{\Sigma }^0)$ and $p\overline{p}\to {\Sigma }^{+}{\overline{\Sigma }}^{-}$ are studied using a Regge-pole exchange model. Only the contribution of the leading trajectory, which in this case is $K^{*}$, is retained. In analogy with $\rho$, we assume a linear trajectory for $K^{*}$ with a slope close to that of $\rho$, and neglect the $t$ dependence of the residues, after the threshold factor has been extracted out. The energy and angular dependence of the cross sections so obtained are in reasonable agreement with experiment.