Multiplicity Distribution Model Based on Cluster Assumption in High-Energy Hadronic Collisions (original) (raw)
Related papers
Multiplicity Distributions in High‐Energy Hadronic Collisions
Annals of the New York Academy of Sciences, 1974
Compare the cross sections shown in FIGURE 1 for the production of a definite number of charged prongs'-6 with the behavior of the simplest multiperipheral models, which follow a Poisson distribution (FIGURE 2). un(s)/n = fine-' /n! where ii = Alns. (1) The resemblance is obvious. That which is apparent to the eye emerges more quantitatively from the numerous analyses of these data which have recently been performed. Fits have been obtained to the data with a dominant multiperipheral component accounting for SO%-lOO% of the inelastic production.B-lo The "multiperipheral" component is more accurately described as a short-rangecorrelation (SRC) component. Let us then review the status of the hypothesis of short-range correlations in rapidity, y, which is defined as
Multiplicity distribution in hadron-nucleus collision and its A-dependence
Nuclear Physics A, 1988
The multiplicity distribution in the hadron-nucleus collision is investigated and its target mass dependence is established empirically. It is seen that if the multiplicity distribution in the nucleonnucleon collision follows a gamma distribution, the same distribution is followed in the nucleonnucleus collision also. However, the parameter K describing the gamma distribution decreases with the target mass. It is conjectured that the parameter K depends inversely on the nucleon size. A simple explanation is then given in terms of increase in the bound-nucleon radius,
Nonextensive statistics and multiplicity distribution in hadronic collisions
Physica A: Statistical Mechanics and its Applications, 2003
The multiplicity distribution of particles in relativistic gases is studied in terms of Tsallis' nonextensive statistics. For an entropic index q > 1 the multiplicity distribution is wider than the Poisson distribution with the same average number of particles, being similar to the negative binomial distribution commonly used in phenomenological analysis of hadron production in high-energy collisions.
Characteristics of compound multiplicity in hadron-nucleus collisions
Indian Journal of Pure & …, 2010
A comparative study of compound multiplicity distribution at three different energies for pion-nucleus and protonnucleus collisions is presented. The variation of the ratio D(N c)/ with black particle multiplicity shows a kind of scaling. The calculated values of R A1 and R A2 are found to be independent of energy and nature of the projectile. The variation of D(N c) with supports Coherent Tube Model(CTM) for proton-nucleus collisions. Moments of the compound multiplicity distribution have also been studied.
1998
We use a nine-parameter expanding source model that includes special relativity, quantum statistics, resonance decays, and freeze-out on a realistic hypersurface in spacetime to analyze invariant pi+, K+, and K- one-particle multiplicity distributions and pi+ and pi- two-particle correlations in nearly central collisions of Pb + Pb at a laboratory bombarding momentum per nucleon of 158 GeV/c. The adjustable parameters of the model are determined by minimizing chi-square with a total of 2137 data points for the five types of data considered, which leads to an acceptable value of 1.017 for chi-square per degree of freedom. Compared to earlier results obtained with this model for nearly central collisions of Si + Au at a laboratory bombarding momentum per nucleon of 14.6 GeV/c, the present results indicate that in Pb + Pb collisions the freeze-out density is somewhat lower, the freeze-out temperature is slightly higher, the source at freeze-out is somewhat larger, and the longitudinal collective velocity is very poorly determined (because of the limited experimental coverage in rapidity). For both reactions, the freeze-out temperature is less than 100 MeV and the longitudinal and transverse collective velocities-which are anti-correlated with the temperature-are substantial. We reconcile these results with those in several previous analyses that yielded a much higher freeze-out temperature of approximately 140 MeV, and finally perform two additional studies with our expanding source model.
Scaling of multiplicity distribution in high energy hadron-nucleus interactions
Analysis of 50 and 340 GeV pion-nucleus and 400 GeV proton-nucleus interactions data for multiplicity scaling study has been carried out. The multiplicity distribution of compound(sum of shower and grey particles in an event), slow (black tracks) particles and target protons ( grey tracks) are found to obey a KNO type scaling law.
Scaling Models of High-Energy Multiparticle Production in Hadron-Hadron Collisions
Physical Review D, 1973
Asymptotic high energy Koba-Nielsen-Olesen scaling of multiplicity distributions is shown to hold in a class of models. The shape of the scaling function is simply related to the shape of the topological cross sections. A statistical study of the models is made and the thermodynamic limit is investigated. An attempt to relate the impact parameter picture of high energy elastic hadron scattering and the scaling phenomenon is presented. Special realistic cases are explored in detail.