[en] Two emulsion chambers composed with emulsion plates and lead plates were exposed to 303 GeV/c proton beam at FNAL to analyze precisely the event structure of proton - nucleus interaction. In the present analysis, large transverse momentum phenomena tagged by high energy gamma-ray emitted in most forward region were investigated. The analysis showed the strong correlation of the charged particles with large transverse momentum (>/GeV/c) with high energy gamma-ray. This result suggests that large transverse momentum protons and excited baryons decaying into neutral pions play important roles in the multiple production phenomena of elementary particles. In particular, the creation and decay of forward excited baryons in large transverse momentum events are discussed. (Yoshomori, M.)