Determination of the internal structure of valons

We determine the internal structure functions of the valons introduced by Hwa and coworkers, using low-psub(t) data and Regge model constraints. Our calibration reaction is the fragmentation process p→π- observed in 70 GeV/c K+p interactions. The fitted valon structure parameters are used to make succesful predictions for various other fragmentation processes (p→π+ and p→K+). A comparison with experimental data of the DIS νW2(x)-values implied by this same fit, indicates that soft processes probe the nucleon typically at a Q2-value fo approx. equal to1 GeV2. This finding supports the hypothesis that soft hadronic reactions are useful (and often unique) tools to learn about hadron quark structure. (orig.)