Multiplicity Distributions Of Secondary Particles Research Articles

Charged-particle multiplicity distributions in different rapidity windows in 800 GeV proton-nucleus interactions

Multiplicity distributions of charged particles produced in interactions of 800 GeV protons with emulsion nuclei in various rapidity windows are presented. The data is also analyzed separately for the forward and the backward hemispheres, for rapidity windows of different widths. It is found that the Negative Binomial Distribution (NBD) describes well the multiplicity distribution of secondary particles in various rapidity windows and also in both the hemispheres. We have compared the NBD parameters, in both the hemispheres, at 200 GeV and 360 GeV, with those at 800 GeV. The behaviour of NBD parameters in rapidity windows of different widths and for different targets has also been studied.

Cascade parametrization of multiplicity distributions in inelastic pp- and [formula omitted]-interactions on energy interval in c.m.s. [formula omitted]–1800 GeV

Based on Saleh–Teich cascade-stochastic formalism the naı̈ve cascade model of multiple charged particles production in inelastic hadron–hadron collisions at high energies is offered. It is shown that the multiplicity charged particles distributions in inelastic p ̄ p - and pp-collisions in all the range of ISR- and S p ̄ – pS energies up to energy of Fermilab tevatron collider s =1800 GeV are well described by Salech–Teich's three-parametrical distribution belonging to a special class of Markov's (generally inhomogeneous) branching Neyman–Scott processes. The ST-distribution is obtained in the supposition that on the first stage of interaction (which is described by homogeneous Poisson process) the random number of primary particles (partons, pomerons, strings, etc.) in rapidity space is produced, and on the secondary stage each of primary particles generates inhomogeneous Poisson process of a random number of secondary particles (“grey” hadrons) production. Thus the decolouration of “grey” hadrons happens on a chosen interval, which part plays the maximum rapidity describing the size of “cylindrical phase volume” on the axes of longitudinal impulse. The analysis of fitting results has allowed obtaining the asymptotic dependence of ST-distribution parameters on energy of interaction, which permit to predict the behavior of multiplicity distributions of secondary particles at superhigh energies.

A CONNECTION OF INELASTICITY WITH MULTIPLICITY DISTRIBUTION AT HIGH ENERGIES

The widely known experimental value of the mean coefficient of the inelasticity <K>~0.5 is calculated by the investigation of a connection of the inelasticity with KNO scaling invariant multiplicity distributions of secondary particles.

Study of nuclear dependence of scaling in 800-GeV proton interactions with emulsion nuclei.

Experimental results on the scaled multiplicity distribution of secondary particles produced in interactions of 800-GeV protons with emulsion nuclei are presented and discussed. The validity of Koba-Nielsen-Olesen scaling has been observed in interactions with nuclei. It has been found that the negative-binomial distribution describes well the scaled multiplicity distribution of secondary particles in proton-emulsion interactions.

Hadron production by 150 GeV muons in nuclear emulsion

This paper reports measurements of the hadrons produced in the inelastic scattering of 150 GeV positive muons in nuclear emulsion. Multiplicity distributions of secondary particles are given and are compared with the results of pion and proton interactions in emulsion at different energies. We find similarities as well as differences between muon and hadron collisions with nuclei.

Multiple production in pion-nucleus interactions in the additive quark model

An analysis of multiplicity distributions of secondary particles produced in pion-nucleus interactions in the framework of the additive quark model (AQM) is presented. The experimental results on average multiplicities, multiplicity distributions, dispersion and normalized multiplicity etc., at various energies, are satisfactorily reproduced by the predictions of AQM except for the 〈 n s〉, n g correlation.

On the Description of Multiplicity Distributions in Multiple Production Processes in Terms of Combinants

A new method of analysis of multiplicity distributions of secondary particles in multiple production processes is discussed and applied to high-energy proton-proton and nucleus-nucleus collisions.

New Upper Bound on Total Cross Section at High Energy

The Froissart-Martin bound on the total cross section is improved by taking into account the multiplicity distribution of secondary particles, in addition to the unitarity, analyticity, and polynomial boundedness of the scattering amplitude in the Martin ellipse.

Mu-Meson Component of Air Shower Below the Ground

Mu-meson component, observed underground, of the extensive air shower is studied, which has come from the nuclear cascade of the shower core in the ground and possibly shows high concentration of mu-mesons below the ground. The total number of them can be estimated independently of energy and multiplicity distributions of secondary particles of the elementary collision each of shower particles undergoes, and also independently of some fluctuations. It is only because they depend upon the whole feature of the nuclear cascade in the shower core. Experimental data of the multiple penetrating particles (M.P.P.), whose feature is the high concentration of mu-mesons, could not be interpreted in terms of those mu-mesons, i. e., decay products within the nuclear cascades in the ground initiated by impinging nucleons of high energy in the air shower cores, even though the possible contribution of the K-meson and Hyperon production in the high energy collisions within nuclear cascades is taken into consideration.