QCD MULTIPLICITY DISTRIBUTIONS IN e+e− ANNIHILATION

1990 ◽  
Vol 05 (28) ◽  
pp. 2343-2349 ◽  
Author(s):  
E. D. MALAZA
Keyword(s):  
Multiplicity Distribution ◽  
Negative Binomial ◽  
Final States ◽  
Multiplicity Distributions ◽  
Perturbative Corrections

We present QCD predictions, including non-leading perturbative corrections of relative [Formula: see text], for the hadronic multiplicity distribution in e+e− annihilation final states. We obtain perturbative expansions whose convergence clearly points to a negative binomial. We anticipate the corrections of O(αs) to be important as the convergence is very slow due to the large [Formula: see text] corrections.

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.

FLUCTUATION PATTERN OF SHOWER AND COMPOUND MULTIPLICITY DISTRIBUTIONS IN NUCLEUS–NUCLEUS INTERACTIONS AT A FEW GeV

2011 ◽  
Vol 20 (05) ◽  
pp. 1287-1306
Author(s):  
DIPAK GHOSH ◽  
ARGHA DEB ◽  
MADHUMITA BANERJEE LAHIRI ◽  
PASUPATI MANDAL ◽  
SUBRATA BISWAS ◽  
...  
Keyword(s):  
Negative Binomial Distribution ◽  
Hurst Exponent ◽  
Multiplicity Distribution ◽  
Negative Binomial ◽  
Factorial Moment ◽  
Two Dimensional ◽  
Fluctuation Pattern ◽  
Frame Work ◽  
Compound Multiplicity ◽  
Multiplicity Distributions

This work presents a study on the multiplicity distribution of shower and compound multiplicity (pions + target protons) emitted from 12 C – AgBr and 24 Mg – AgBr interactions at 4.5 AGeV in terms of negative binomial distribution (NBD) and also on the fluctuation pattern of shower and compound multiplicity in the frame work of two-dimensional factorial moment methodology using the concept of Hurst exponent.

ON MULTIPLICITY DISTRIBUTIONS

1996 ◽  
Vol 11 (34) ◽  
pp. 2681-2692 ◽  
Author(s):  
DING-WEI HUANG
Keyword(s):  
Multiplicity Distribution ◽  
Negative Binomial ◽  
High Energy ◽  
Energy Limit ◽  
High Energy Limit ◽  
Multiple Production ◽  
Very High Energy ◽  
Multiplicity Distributions ◽  
Very High ◽  
New Distribution

We show that four different approaches in multiple production give exactly the same multiplicity distribution. Various experimental data can be well described by this new multiplicity distribution. We compare this new distribution to the negative binomial distribution. The restoration of KNO scaling at the very high energy limit is discussed. A nonvanishing value of the scaled multiplicity distribution Ψ(z) at z=0 is predicted.

scholarly journals INFLUENCE OF STATISTICAL FLUCTUATIONS ON K/π RATIOS IN RELATIVISTIC HEAVY ION COLLISIONS

2001 ◽  
Vol 16 (07) ◽  
pp. 1227-1235 ◽  
Author(s):  
C. B. YANG ◽  
X. CAI
Keyword(s):  
Negative Binomial ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Relative Variance ◽  
Ion Collisions ◽  
Statistical Fluctuations ◽  
Binomial Distributions ◽  
The Mean ◽  
Multiplicity Distributions ◽  
Statistical Background

The influence of pure statistical fluctuations on K/π ratio is investigated in an event-by-event way. Poisson and the modified negative binomial distributions are used as the multiplicity distributions since they both have statistical background. It is shown that the distributions of the ratio in these cases are Gaussian, and the mean and relative variance are given analytically.

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.

GLOBAL PROPERTIES OF MULTIPLICITY DISTRIBUTIONS AND MULTIPLICITY CORRELATIONS IN e+e- ANNIHILATION AT LEP ENERGIES AS A MEASURE OF COHERENT DYNAMICS

1991 ◽  
Vol 06 (01) ◽  
pp. 55-60 ◽  
Author(s):  
SAUL BARSHAY
Keyword(s):  
Multiplicity Distribution ◽  
Dynamical Processes ◽  
Global Properties ◽  
Coherent Dynamics ◽  
Multiplicity Distributions

We study the possibility of the observable emergence of dynamical forward-backward multiplicity correlations among produced charge hadrons, and of a steadily broadening multiplicity distribution in e+e- annihilation at LEP. It is important to measure three related global properties. These reflect coherent dynamical processes in and among jets.

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