Reactions with leading hadrons in meson-proton interactions at 250 GeV/ $c$

Abstract

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

Higher order Bose-Einstein Correlations test the Gaussian density matrix and the space-time approach

“…Similar caveats apply to [11] where an analysis of the same NA22 data as those investigated in the present paper was presented and where only "marginal" agreement with the simplified quantum optical model of [12,13] was found. The fact that in the present work we could fit the same data supports the space-time approach and the necessity of a simultaneous fit.…”

“…On the other hand in [8] and [15] the momentum-space approach was used, the currents 11 We have also calculated the statistical errors associated with our fits. This was done by fixing, at a given run, 3 parameters out of the total 4 and searching until an increase of …”

“…In [20] the same momentum-space model ( [12,13,15]) as that used in [11] was applied and compared with UA1-collaboration data. This time a new technique for estimating the correlation data was used but only second and third order correlations were considered.…”

“…a) The phase-space is generated by Monte Carlo routines which take into account the experimental detection conditions mentioned in [11,18,19] (defined by |x F | < 0.5) and references quoted there 5 .…”

“…Experimentally correlations of three and more particles have been studied in the last years in [1]- [11] and more recently attempts have been made to analyze these correlations in terms of simplified models [12]- [15] without clear space-time implications for the emitting source (sources).…”