\Theta^+ and \Lambda(1520) production in pp reactions at high energies
  We estimate the cross sections for the inclusive production of $\Theta^+$ and $\Lambda(1520)$ in $pp$ collisions at high energy using the $K$ exchange diagrams. We find that inclusive $\Theta^+$ production should be at the level of 1 $\mu$b at energies~ $\sqrt{s}~\gtrsim~10~{\rm GeV}$. The ratio of $\Theta^+(1540)$ to $\Lambda(1520)$ production cross-sections is $\sim 1%$. 
I.M.Narodetskii and M.A.Trusov