SOME CHARACTERISTICS OF THE COMPOUND MULTIPLICITY IN HIGH-ENERGY NUCLEUS–NUCLEUS INTERACTIONS

2011 ◽  
Vol 20 (08) ◽  
pp. 1735-1754 ◽  
Author(s):  
M. MOHERY ◽  
M. ARAFA
Keyword(s):  
Experimental Data ◽  
Impact Parameter ◽  
Mass Number ◽  
Multiplicity Distribution ◽  
High Energy ◽  
Projectile Nucleus ◽  
Target Mass ◽  
Compound Multiplicity ◽  
Multiplicity Distributions ◽  
The Impact

The present paper deals with the interactions of 22 Ne and 28 Si nuclei at (4.1–4.5)A GeV /c with emulsion. Some characteristics of the compound multiplicity nc given by the sum of the number of shower particles ns and grey particles ng have been investigated. The present experimental data are compared with the corresponding ones calculated according to modified cascade evaporation model (MCEM). The results reveal that the compound multiplicity distributions for these two reactions are consistent with the corresponding ones of MCEM data. It can also be seen that the peak of these distributions shifts towards a higher value of nc with increasing projectile mass. It may further be seen that the compound multiplicity distributions becomes broader with increasing target size and its width increases with the size of the projectile nucleus. In addition, it has been found that the MCEM can describe the compound multiplicity characteristics of the different projectile, target and the correlation between different emitted particles. The values of average compound multiplicity increase with increasing mass of the projectile. Furthermore, it is observed that while the value of 〈nc〉 depends on the mass number of the projectile Ap and the target mass number At, the value of the ratio 〈nc〉/D(nc) seems to be independent of Ap and At. The impact parameter is found to affect the shape of the compound multiplicity distribution. Finally, the dependence of the average compound multiplicity on the numbers of grey and black particles, and the sum of them, is obvious. The values of the slope have been found to be independent of the projectile nucleus.

Compound multiplicity in the collisions of 4.1 A GeV/c 22Ne nuclei with nuclear emulsion

2002 ◽  
Vol 80 (2) ◽  
pp. 109-117 ◽  
Author(s):  
Z Abou-Moussa
Keyword(s):  
Impact Parameter ◽  
Linear Dependence ◽  
Nuclear Emulsion ◽  
Mass Number ◽  
Multiplicity Distribution ◽  
Charged Particles ◽  
Heavy Charged Particles ◽  
Target Mass ◽  
Compound Multiplicity ◽  
The Impact

This work displays a study of the compound multiplicity characteristics of 4.1 A GeV/c 22Ne–emulsion interactions, where the number of shower and grey particles taken together is termed as compound multiplicity, Nc. The present data are compared with the corresponding ones obtained for other projectiles at nearly the same momentum per nucleon. It is observed that while the average compound multiplicity depends on the mass number of the projectile, Ap, the value of the ratio <Nc>/D(Nc) seems to be independent of Ap. The impact parameter is found to affect the shape of the compound multiplicity distribution. A positive linear dependence of the compound multiplicity on both the black and heavy charged particles is also noted. Finally, the results indicate that the value of <Nc> depends also on the target mass number. PACS No.: 25.70

Study of multiplicity correlations in nucleus–nucleus interactions at high energy

2015 ◽  
Vol 24 (06) ◽  
pp. 1550048 ◽  
Author(s):  
M. Mohery ◽  
E. M. Sultan ◽  
Shadiah S. Baz
Keyword(s):  
Experimental Data ◽  
Strong Correlation ◽  
Multiplicity Distribution ◽  
Charged Particles ◽  
High Energy ◽  
The Other ◽  
Heavy Particles ◽  
Projectile Nucleus ◽  
Compound Multiplicity ◽  
Experimental Values

In the present paper, some results on the correlations of the nucleus–nucleus interactions, at high energy, between different particle multiplicities are reported. The correlations between the multiplicities of the different charged particles emitted in the interactions of 22 Ne and 28 Si nuclei with emulsion at (4.1–4.5)A GeV/c have been studied. The correlations of the compound multiplicity nc, defined as the sum of both numbers of the shower particles ns and grey particles ng, have been investigated. The experimental data have been compared with the corresponding theoretical ones, calculated according to the modified cascade evaporation model (MCEM). An agreement has already been fairly obtained between the experimental values and the calculated ones. The dependence of the average compound multiplicity, on the numbers of shower, grey, black and heavy particles is obvious and the values of the slope have been found to be independent of the projectile nucleus. On the other hand, the variation of the average shower, grey, black and heavy particles is found to increase linearly with the compound particles. A strong correlation has been observed between the number of produced shower particles and the number of compound particles. Moreover, the value of the average compound multiplicity is found to increase with the increase of the projectile mass. Finally, an attempt has also been made to study the scaling of the compound multiplicity distribution showing that the compound multiplicity distribution is nearly consistent with the KNO scaling behavior.

Tsallis nonextensive entropy and the multiplicity distributions in high energy leptonic collisions

2016 ◽  
Vol 25 (06) ◽  
pp. 1650041 ◽  
Author(s):  
S. Sharma ◽  
M. Kaur ◽  
Sandeep Kaur
Keyword(s):  
Experimental Data ◽  
Multiplicity Distribution ◽  
High Energy ◽  
New Approach ◽  
High Energies ◽  
Nonextensive Entropy ◽  
Tsallis Distribution ◽  
Multiplicity Distributions ◽  
Better Than

The nonextensive behavior of entropy is exploited to explain the regularity in multiplicity distributions in [Formula: see text] collisions at high energies. The experimental data are analyzed by using Tsallis [Formula: see text]-statistics. We propose a new approach of applying Tsallis [Formula: see text]-statistics, wherein the multiplicity distribution is divided into two components; two-jet and multijet components. A convoluted Tsallis distribution is fitted to the data. It is shown that this method gives the best fits which are several orders better than the conventional fit of Tsallis distribution.

NEGATIVE BINOMIAL DISTRIBUTION AND MULTIPLICITY DISTRIBUTIONS FOR e+e− AND $p\bar{p}$ COLLISIONS

1986 ◽  
Vol 01 (09) ◽  
pp. 553-556
Author(s):  
C.K. CHEW ◽  
S. DATÉ ◽  
D. KIANG
Keyword(s):  
Experimental Data ◽  
Charged Particle ◽  
Impact Parameter ◽  
Negative Binomial Distribution ◽  
Binomial Distribution ◽  
Multiplicity Distribution ◽  
Negative Binomial ◽  
Particle Multiplicity ◽  
Charged Particle Multiplicity ◽  
Multiplicity Distributions

The charged particle multiplicity distribution in [Formula: see text] collision is related to that of e+e− in a class of geometric models. The multiplicity distribution at a given impact parameter is taken to be a negative binomial distribution. The calculation agrees well with the experimental data.

A study of high energy hadron–nucleus interactions

1983 ◽  
Vol 61 (7) ◽  
pp. 1120-1141 ◽  
Author(s):  
H. Khushnood ◽  
A. Shakeel ◽  
A. Ahmad ◽  
M. Z. Ahsan
Keyword(s):  
Multiplicity Distribution ◽  
High Energy ◽  
Target Mass ◽  
The Mean ◽  
Multiplicity Distributions ◽  
Energy Hadron

An attempt has been made to investigate the multiplicity distributions of grey, black, shower, and heavy tracks, the dispersions of their distributions, intercorrelations between them, the dependence of the mean normalized multiplicity on the target mass and energy, etc., in hadron–nucleus interactions at 24, 50, and 400 GeV incident energies. The results obtained in the study reveal that the behaviour of the multiplicity distribution is independent of the nature and energy of the impinging hadron. Furthermore, on redefining the mean normalized multiplicity, it is found to be not only energy independent but also projectile independent, suggesting a new kind of scaling in particle–nucleus interactions.

scholarly journals TACHYON DYNAMICS OF THE BLACK DISC LIMIT IN THE HARD SMALL x PROCESSES IN QCD

2006 ◽  
Vol 21 (07) ◽  
pp. 549-558 ◽  
Author(s):  
B. BLOK ◽  
L. FRANKFURT
Keyword(s):  
Cross Section ◽  
Impact Parameter ◽  
High Energy ◽  
Black Disk ◽  
Black Disc ◽  
Energy Behavior ◽  
Small X ◽  
The Cross ◽  
The Impact ◽  
Black Disc Limit

We investigate the effective field theory (EFT) which gives the approximate description of the scattering of two hard small dipoles in the small x processes in QCD near the black disc limit (BDL). We argue that the perturbative QCD approaches predict the existence of tachyon and visualize it in the approximation where α′P=0. We demonstrate that the high energy behavior of the cross-section depends strongly on the diffusion law in the impact parameter plane. On the other hand, almost threshold behavior of the cross section of the hard processes and multiplicities, i.e. fast increase of cross sections (color inflation), melting of ladders into color network and softening of the longitudinal distributions of hadrons are qualitatively insensitive to the value of diffusion in the impact parameter space. We evaluate α′P near the black disk limit and find significant α′P as the consequence of the probability conservation.

MULTIPLICITY DISTRIBUTIONS IN LIMITED PSEUDORAPIDITY INTERVALS

1986 ◽  
Vol 01 (01) ◽  
pp. 15-21 ◽  
Author(s):  
C.S. LAM ◽  
M.S. ZAHIR
Keyword(s):  
Experimental Data ◽  
Multiplicity Distribution ◽  
Number Of Clusters ◽  
Total Multiplicity ◽  
Multiplicity Distributions

We calculate the multiplicity distributions in fixed pseudorapidity intervals |η|≤ηc for [Formula: see text] collisions at [Formula: see text] GeV from the total multiplicity distribution. Agreement with experimental data is good where expected. This calculation may be regarded as giving a relation between the number of clusters lying inside |η|≤ηc and the partition temperature Tp(N) introduced by Chou, Yang and Yen for N produced particles.

scholarly journals Dependence of the multiplicities of secondary particles on the impact parameter in collisions of high-energy neon and iron nuclei with photoemulsion nuclei

1993 ◽  
Vol 551 (4) ◽  
pp. 723-733 ◽  
Author(s):  
V.E. Dudkin ◽  
E.E. Kovalev ◽  
N.A. Nefedov ◽  
V.A. Antonchik ◽  
S.D. Bogdanov ◽  
...  
Keyword(s):  
Impact Parameter ◽  
High Energy ◽  
Secondary Particles ◽  
The Impact

OSCILLATORY MOMENTS IN LEE-YANG ZEROS AND LHC PREDICTIONS

2009 ◽  
Vol 24 (18n19) ◽  
pp. 3447-3454 ◽  
Author(s):  
A. DEWANTO ◽  
A. H. CHAN ◽  
Z. H. LIM ◽  
C. H. OH
Keyword(s):  
Experimental Data ◽  
Quantum Chromodynamics ◽  
Generating Function ◽  
Multiplicity Distribution ◽  
High Energy ◽  
Energy Collision ◽  
Oscillatory Behaviour ◽  
High Energy Collision ◽  
Electron Positron ◽  
Scattering Events

We study the moments of multiplicty distribution and its relation to the Lee-Yang zeros of the generating function in electron-positron and hadron-hadron high energy collision. Our work shows that GMD moments can reproduce the oscillatory behaviour as shown in the experimental data and predicted by quantum chromodynamics at preasymptotic energy, while it can also be used to distinguish electron-positron (e+e-) multiplicity data from hadron-hadron (pp and [Formula: see text]) multiplicity. Furthermore, there seems to be a link between the development of shoulder structure in the multiplicity distribution and the development of ear structure in the Lee-Yang zeros. We predict that these structures is going to be very obvious at 14 TeV. We argue that the development of these structures indicates an ongoing transition from quark-dominated soft scattering events to gluon-dominated semihard scattering events.

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