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Onderzoeksleider NFWO, Belgium for the relatively large multiplicity of associated pions, are not properly treated in the model. responsible for the production of leading hadrons with relatively large transverse momentum as well as versions of the FRITIOF fragmentation model. We show that the hard-like sub-processes, essentially characteristics of the rr+~induced non-diffractive reactions are compared to predictions of current collisions, but differs from that obtained in e+e` -annihilation. The multiplicity and (semi)inclusive of associated pions on their effective mass is essentially consistent with that observed in pp and 77 250 GeV/c. In reactions with two leading hadrons, the dependence of the average charge multiplicity Inelastic final states with one or two leading hadrons are studied in 1r+p and K+p interactions at system X,, on the effective mass MX of this system for the reactions present the dependence of the average charged particle multiplicity of the associated central hadron and K+p-interactions at 250 GeV/c. The experimental procedure is described in Sect. 2. In Sect. 3, we This work, therefore, is devoted to the study of the properties of leading-hadron production in 1r+p improvement of the model predictions.therefore, expected to provide new information on the underlying hard-like effects necessary for the interactions). A more detailed experimental study of hadronic final states with leading hadron(s) is, incident hadrons (e.g. a proton at :c < -0.5 and a vr+(K+) meson at sc > 0.5 for the case of w+ (K+)p evident for leading hadrons (|a;| > 0.5), the largest fraction of which are known to be identical to the (pT) that is too small in the fragmentation regions. The inconsistency between model and data is most spectra (the m-dependence of (pT)) for both single particles and hadron systems, since it predicts a proton interactions at 250 GeV/c [7], the model fails, however, to reproduce the double-differential differential inclusive distributions in high-energy hadronic collisions. As has been shown for meson fragmentation model [6] allows for the reproduction of the charged particle multiplicity and singleThe consideration of these types of sub-processes in the recently proposed version of the FRITIOF as parton-parton scattering and gluon radiation [5, 6].it can be supposed that even in that case the non-scaling effects derive from hard-like phenomena, such physical picture of the interaction of composite particles (hadrons) is more complicated. Nevertheless, can be successfully described by hard gluon emission from one or two leading (current) quarks. TheIn deep-inelastic processes initiated by non-composite particles (leptons), the non-scaling effects "sea-gull" wings with increasing (/5 [1-4].in the Feynman-sc dependence of the average transverse momentum (pT), the lifting of the so-called increasing collision energy (/5. In particular, these effects give rise to a scaling violation observed scattering as well as in hadron-hadron collisions, is the increase of the role of hard-like effects with

Onderzoeksleider NFWO, Belgium EC guest scientist, now at DESY, Hamburg Parton Model.are compared with results obtained by Monte·Carlo simulation according to a two-component Dual particles suggest re-scattering of the emitted particles on other nucleons of the nucleus. All these facts dependence of the emitted proton multiplicity and the angular distributions of the produced charged of negative particles produced diffractively is found not to be sensitive to the nuclear mass. The A on the t-dependence of the cross section are fitted in the usual exponential form. The mean multiplicityAbstract. An analysis of the A-dependence of the target-diffractive cross-section is presented. Data to the squared four-momentum transfer region --t > 0.025 GeV2 due to the trigger bias in the very of the trigger weights used in the interval 0.1 >-t > 0.025 GeV2 is 2.29. We restrict the analysis each reconstructed event from the overall azimuthal symmetry around the beam axis. The mean value [13]. This weight depends strongly on the spatial characteristics of the event. It is determined for weight. Futhermore, each event is weighted to correct for losses induced by the interaction trigger of the track and the topology of the event and events are weighted with a multiplicity dependent In order to compensate for losses due to item 3, tracks are weighted depending on the charge 4. the event is not a candidate for an elastic or coherent interaction with the nucleus. on the event topology; 3. the loss of tracks due to measurement or reconstruction failures is limited in number, depending 2. the interaction vertex is within one of the nuclear foils;1. The beam track is well measured and reconstructed; [12]. They can be summarized as follows:The selection criteria for the event and track sample are described in detail in our earlier paper momentum up to 1.2 GeV/c. use ionization measurements to identify slow charged particles, mainly recoil protons, with laboratory have been detected in a single experiment. As a vertex detector, the RCBC provided a good tool to a vertex detector simultaneously. Thus, interactions with hydrogen as well as with Al and Au nuclei 0.64 mm, respectively, corresponding to 0.5% of an interaction length, has been used as a target and with two nuclear targets consisting of an aluminium and a gold foil with thickness of 2.5 mm and about the parton structure of nucleons inside the nucleus or on the dynamics of Pomeron interaction both experimentally and theoretically. This, in spite of the fact that such a process could give clues of experiments [1][2][3][4][5][6][7][8]. Nuclear target diffraction dissociation, on the other hand, is scarcely studied,

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