Abstract

Measurements are reported of inclusive production of π0-mesons in the beam fragmentation region in γp, πp andKp collisions. Results include the ratio of π0 production inKp and πp collisions, showing reduced production from fragmentation of theK-meson, and the ratio of π0 production in photon and hadron collisions which shows agreement with modified Vector Meson Dominance at lowP T , and departures at higherP T signalling the onset of direct photon reactions. The pattern of departure from Feynman scaling at highP T points to a contribution of hard parton-parton collisions in both γp and πp collisions.

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