Inclusive photoproduction and the triple Regge formula

The inclusive reactions $gamma$p$Yields$$pi$$sup +$ or $pi$$sup -$+ anything and $gamma$n$Yields$$pi$$sup +$ or $pi$$sup -$+ anything at the photon energy of 7.5GeV were studied. The high $pi$$sup +$/$pi$$sup -$ ratio observed in the target fragmentation region is explained by applying the triple Regge formalism. The inclusive photoproduction of the $delta$$sup ++$ and rho$sup 0$ resonances is also investigated. (FR)