Pseudorapidity Distributions Of Shower Particles Research Articles

Investigation of shower particle pseudorapidity in high-energy neutrino-emulsion collisions

The pseudorapidity distribution of shower particles produced in high-energy neutrino-emulsion collisions is investigated. A slight dependence of the midpseudorapidity on multiplicity and a fluctuation in pseudorapidity distribution are observed. The cumulative pseudorapidity distribution and the pseudorapidity gap distribution are studied. A two-cylinder model is used in analyzes of the experimental data. To give a further test for the two-cylinder model, the calculated results are compared with the experimental data of e + e - annihilation at high energy. It is shown that the calculated results are in agreement with the experimental data.

Pseudorapidity distribution of shower particles in relativistic nucleus–nucleus collisions

The multiplicity and pseudorapidity distributions of shower particles produced in interactions of the 24Mg at 4.5A GeV/c was studied in nuclear emulsion. The results indicated that the multiplicity distributions of shower particles produced in the collisions depend on the projectile mass. The pseudorapidity distributions are approximately Gaussian in shape. Also, the peaks of the pseudorapidity distributions of shower particles tend to shift towards the lower values of the pseudorapidity with increasing number of the shower particles. PACS Nos.: 25.75.-q, 29.40.Rg

Pseudorapidity (rapidity) distribution of shower particles in relativistic nucleus-nucleus collisions

The pseudorapidity distributions of shower particles from the interactions accompanied by the emission of backward relativistic hadrons in nucleus-emulsion collisions at Dubna energy have been studied by a thermalized cylinder model. The wide distribution fitted by two Gaussian distributions and the narrow distribution fitted by one Gaussian distribution can be described by the thermalized cylinder model. A Monte Carlo calculation shows that the thermalized cylinder model gives a good description of the statistical fluctuations in experimental pseudo-rapidity distribution. The calculated results are in agreement with the experimental data in the collisions of C, Ne and Si with emulsion nuclei at incident momentum in the range (4.1–4.5)AGeV/c. An isotropic emission fireball and a transverse or longitudinal flow are used to describe the rapidity distributions of charged particles produced in relativistic nucleus-nucleus collisions. A transverse flow is observed at a lower energy (1AGeV) and a longitudinal flow is observed at a higher energy (200AGeV). Our Monte Carlo calculated results are in agreement with the experimental data of Au-Au collisions at 1AGeV, O-Au collisions at 60A and 200AGeV, S-S collisions at 200AGeV, and S-Ag collisions at 200AGeV.

Multiplicity and pseudorapidity distribution in high-energy neutrino-emulsion collisions

The multiplicity and pseudorapidity distributions inneutrino-emulsion collisions at high energies are investigated. Themultiplicity distribution of charged particles, the pseudorapiditydistributions of shower particles, as well as the correlation between amean maximum number density of shower particles and multiplicity, are given.PACS No.: 13.85.Hd

Pseudorapidity distribution of shower particles in heavy ion induced interactions in nuclear emulsion at high energy

The pseudorapidity distribution of shower particles produced in nuclear emulsions in heavy ion induced interactions have been studied at high energies. The thermalized cylinder picture is successful in the description of the pseudorapidity distribution of shower particles in the accelerator energy regions available at present. The calculated results are in agreement with the experimental data of $3.7A,14.6A,60A,$ and $200A$ GeV O-AgBr, $14.6A$ GeV Si-AgBr, $200A$ GeV S-AgBr, and $10.6A$ GeV Au-Em (emulsion) interactions.

Characteristics of charged particle multiplicities distribution in relativistic heavy-ion interactions.

Multiplicity and pseudorapidity distributions of shower particles produced in interactions of the {sup 197}Au at 10.6{ital A} GeV, {sup 28}Si at 14.5{ital A} GeV, {sup 16}O and {sup 32}S at 200{ital A} GeV beams were studied in nuclear emulsion. The pseudorapidity ({eta}) distributions are approximately Gaussian in shape. Their widths increase monotonically from central to peripheral collisions with energy and with the size of the target. The widths of the pseudorapidity distributions, the values of their centroid, pseudorapidity density and {eta}{sub peak} values are compared among the different groups of their multiplicity at different energies as a function of centrality for all four beams. {copyright} {ital 1996 The American Physical Society.}

Charged particle multiplicity and pseudorapidity density distributions in 16O, 28Si and 197Au-induced nuclear interactions at 14.6 and 11.6A GeV/c

Pseudorapidity density and multiplicity distributions of charged particles produced in heavy-ion collisions at the BNL AGS have been studied. The multiplicity distributions and pseudorapidity distributions of shower particles in Au-induced interactions are presented and compared with model predictions from RQMD, FRITIOF and VENUS. It is shown that the widths of the pseudorapidity distributions of produced particles in central collisions are independent of the interacting system. The results from EMU01 have been compared, and found to agree, with the results from two other heavy-ion experiments, E802 and E814.

Pseudorapidity distributions from pion-emulsion interactions in the energy range 60 GeV to 300 GeV

The analysis of experimental data for pion-nucleus interactions in the energy range 60 GeV–300 GeV is presented. The pseudorapidity distributions of shower particles are analyzed in terms of pion energy and the average number of intra-nuclear collisions of the projectile. The particle densities in the projectile fragmentation region are compared to predictions of the additive quark model. The relation between the average number of wounded quarks in the projectile and the number of fast protons emitted from the struck nucleus is derived and used to extract from the experimental π−-emulsion data the fragmentation functions for both wounded and spectator quarks. These functions are then used to described the results of independent π−-proton and π−-deuteron experiments.

Nuclear Interactions at 340 GeV/c π--Emulsion Interactions

In the present work we report some new data on charged particle multiplicity and pseudorapidity distributions of shower particles produced in pion-emulsion collisions at 340 GeV/c. Some of the results are compared with the data from proton-nucleus interactions at 400 GeV/c. From the study of pseudorapidity distributions of charged shower particles, it is noticed that the maxima of η-distributions shifts towards smaller values of η with increasing n g . Bi-modality in the η-distributions is observed for all n g -intervals at 340 GeV/c. There is no tendency of appreciable change in the dispersions of η-distributions with increasing n s , n g or N h , except in the region of small values of n g and N h . Forward-backward correlation has also been investigated.

A study of inelastic hadron–nucleus interactions at 50 and 400 GeV

Some results on multiplicity, mean normalized multiplicity, and pseudorapidity distributions of shower particles produced in pion–nucleus and proton–nucleus collisions at 50 and 400 GeV are presented and discussed. From the study of the pseudorapidity distributions, it is found that the projectile fragmentation is mass independent and the target fragmentation depends upon the target size. The effect of nuclear mass on the forward–backward asymmetry is also examined by using the grey particle multiplicity data. Upon using the additive quark model, a new kind of nuclear scaling is observed between RA4, in terms of created charged particles and [Formula: see text].

A study of particle–nucleus collisions at 24, 50, and 400 GeV/c

An attempt has been made to investigate multiplicity, dispersion, and pseudorapidity distributions of shower particles produced in 24, 50, and 400 GeV/c hadron–nucleus collisions. The study of pseudorapidity reveals that with the increase in the mass number of the target nucleus, the excess of particles appears in the target fragmentation region, shifting the maxima of the distributions towards smaller values of rapidity. Further, with the increase in the incident energy, the excess of particles appears in the projectile fragmentation region. Finally, on using the additive quark model, the mean normalized multiplicity has been observed to be independent of the energy and nature of the projectile, suggesting a new kind of scaling in hadron–nucleus collisions.