Exclusive baryon-antibaryon production in $\gamma\gamma$ collisions at   e+e- colliders
  The exclusive production of baryon-antibaryon pairs in the collisions of two quasi-real photons has been studied using different detectors at e+e- colliders. Results are presented for $\gamma\gamma\to$ proton antiproton, $\gamma\gamma\to\Lambda\bar{\Lambda}$, and $\gamma\gamma\to \Sigma^{0}\bar{\Sigma^{0}}$ final states. The cross-section measurements are compared with all the existing experimental data and with the analytic calculations based on the three-quark model, on the quark-diquark model, and on the handbag model. 
Teresa Barillari