scholarly journals A Study of Pion-Nucleus Interactions in terms of Compound Particles

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Tufail Ahmad
Keyword(s):  
Multiplicity Distribution ◽  
Charged Particles ◽  
Mean Value ◽  
Shower Particle ◽  
Particle Multiplicity ◽  
Compound Multiplicity ◽  
The Mean ◽  
Multiplicity Distributions ◽  
Distribution Shifts ◽  
Compound Particle

We report some results on the compound multiplicity distribution at 340 GeV/c π- nucleus interactions. Compound multiplicity distribution is found to depend on the target size and the distribution becomes broader. The peak of the distribution shifts towards higher values of the compound particle multiplicity. Mean compound multiplicity is found to vary linearly with grey, heavy, and shower particle multiplicity. Correlations between different particle multiplicities have been studied in detail. Dispersion of compound multiplicity distributions and its ratio with the mean value is observed to obey a linear relationship with different particle multiplicities except for shower particles where dispersion is almost independent of shower particles. Mean normalized multiplicity has also been studied in terms of created charged particles.

A STUDY OF COMPOUND PARTICLES IN EMULSION

2014 ◽  
Vol 6 (2) ◽  
pp. 1172-1177
Author(s):  
Tufail Ahmad
Keyword(s):  
Linear Dependence ◽  
Multiplicity Distribution ◽  
Particle Multiplicity ◽  
Black Particle ◽  
Compound Multiplicity ◽  
The Mean ◽  
Compound Particle

An attempt is made to study the compound particles by taking black and shower particles together. Average compound particle multiplicity is found to vary linearly with heavily ionizing particle multiplicity but with black particle multiplicity it does not show a linear dependence. Dispersion of the compound multiplicity distribution has also been studied. The ratio of the mean number of compound particles to its dispersion for different target sizes has been calculated.

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.

GENESIS OF THE LOGNORMAL MULTIPLICITY DISTRIBUTION IN THE e+e− COLLISIONS AND OTHER STOCHASTIC PROCESSES

1990 ◽  
Vol 05 (23) ◽  
pp. 1851-1869 ◽  
Author(s):  
R. SZWED ◽  
G. WROCHNA ◽  
A. K. WRÓBLEWSKI
Keyword(s):  
Limit Theorem ◽  
Multiplicity Distribution ◽  
Scaling Function ◽  
Average Multiplicity ◽  
Linear Functions ◽  
Scale Invariant ◽  
The Central Limit Theorem ◽  
The Mean ◽  
Multiplicity Distributions ◽  
The Scaling Function

It has been observed that the e+e− multiplicity distributions exhibit the following properties: the dispersions are linear functions of the mean and the distributions obey the KNO-G scaling with the scaling function of the lognormal shape. In this paper the scale invariant branching is assumed as a mechanism within which all these properties could be derived. It is shown that the lognormal shape of the scaling function can be obtained within proposed mechanism by using the generalization of the Central Limit Theorem. The dependence of the average multiplicity on energy is also derived within the postulated framework. It is also shown that many other phenomena encountered in nature have the similar statistical properties.

Shower Particle Multiplicity Distribution in High Energy Nuclear Reactions

1989 ◽  
Vol 501 (3) ◽  
pp. 189-199
Author(s):  
M. T. Hussein ◽  
N. M. Hassan ◽  
M. K. Hegab
Keyword(s):  
Multiplicity Distribution ◽  
Nuclear Reactions ◽  
High Energy ◽  
Shower Particle ◽  
Particle Multiplicity

scholarly journals Charged-particle multiplicity fluctuations in Pb–Pb collisions at $$\sqrt{s_{\mathrm {NN}}}$$  = 2.76 TeV

2021 ◽  
Vol 81 (11) ◽  
Author(s):  
S. Acharya ◽  
D. Adamová ◽  
A. Adler ◽  
J. Adolfsson ◽  
G. Aglieri Rinella ◽  
...  
Keyword(s):  
Charged Particle ◽  
Multiplicity Distribution ◽  
Hadron Collider ◽  
Monte Carlo Event ◽  
Particle Multiplicity ◽  
Charged Particle Multiplicity ◽  
Central Collisions ◽  
The Mean ◽  
Lower Collision ◽  
Pseudorapidity Range

AbstractMeasurements of event-by-event fluctuations of charged-particle multiplicities in Pb–Pb collisions at $$\sqrt{s_{\mathrm {NN}}}$$ s NN  $$=$$ =  2.76 TeV using the ALICE detector at the CERN Large Hadron Collider (LHC) are presented in the pseudorapidity range $$|\eta |<0.8$$ | η | < 0.8 and transverse momentum $$0.2< p_{\mathrm{T}} < 2.0$$ 0.2 < p T < 2.0  GeV/c. The amplitude of the fluctuations is expressed in terms of the variance normalized by the mean of the multiplicity distribution. The $$\eta $$ η and $$p_{\mathrm{T}}$$ p T dependences of the fluctuations and their evolution with respect to collision centrality are investigated. The multiplicity fluctuations tend to decrease from peripheral to central collisions. The results are compared to those obtained from HIJING and AMPT Monte Carlo event generators as well as to experimental data at lower collision energies. Additionally, the measured multiplicity fluctuations are discussed in the context of the isothermal compressibility of the high-density strongly-interacting system formed in central Pb–Pb collisions.

Features about pion production in 2.1A and 3.7AGeV 4He–nucleus interactions up to and out of kinematical limit

2018 ◽  
Vol 27 (03) ◽  
pp. 1850026 ◽  
Author(s):  
A. Abdelsalam ◽  
B. M. Badawy ◽  
H. A. Amer ◽  
W. Osman ◽  
M. M. El-Ashmawy ◽  
...  
Keyword(s):  
Pion Production ◽  
Hadronic Matter ◽  
Shower Particle ◽  
Particle Multiplicity ◽  
Single Source ◽  
Pion Multiplicity ◽  
Multiplicity Distributions ◽  
Limiting Fragmentation ◽  
Kinematical Limit ◽  
Fritiof Model

The shower particle multiplicity characteristics are studied in 2.1A and 3.7A GeV 4He interactions with emulsion nuclei. The dependencies on emission direction, energy, target size, and centrality are examined. The data are compared with the simulation of the modified FRITIOF model. The forward emitted pion multiplicity distributions exhibit KNO scaling. The decay or peaking shaped curves characterize the pion multiplicity distributions. The decay shape is suggested to be due to a single source contribution and the peaking one results from a multisource superposition. The forward emitted pion is created from fireball or hadronic matter. The target nucleus is the origin of the backward one, regarding the nuclear limiting fragmentation hypothesis.

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.

A CONNECTION OF INELASTICITY WITH MULTIPLICITY DISTRIBUTION AT HIGH ENERGIES

1992 ◽  
Vol 07 (26) ◽  
pp. 2401-2406 ◽  
Author(s):  
ISAY GOLYAK
Keyword(s):  
Multiplicity Distribution ◽  
Secondary Particles ◽  
High Energies ◽  
The Mean ◽  
Multiplicity Distributions ◽  
Scaling Invariant

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.

TARGET MASS DEPENDENCE AND SCALING OF THE CHARGED PARTICLE MULTIPLICITY

1987 ◽  
Vol 02 (04) ◽  
pp. 251-260
Author(s):  
M. SHYAM ◽  
I.D. OJHA ◽  
S.K. TULI
Keyword(s):  
Multiplicity Distribution ◽  
Empirical Relation ◽  
Particle Multiplicity ◽  
Charged Particle Multiplicity ◽  
Mass Dependence ◽  
Proton Proton ◽  
Proton Collisions ◽  
Target Mass ◽  
The Mean ◽  
Proton Proton Collisions

Target mass dependence of multiplicity distribution of particles produced in hadron-nucleus interactions is exhibited by a new kind of empirical relation through the study of the mean number of wounded quarks. Scaling in proton-nucleus as well as proton-proton collisions is studied and is extrapolated to see its applicability to the data at the highest energy available.

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.

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