Pseudorapidity distribution and cluster formation in 50 and 400 GeV/c hadron–nucleus interactions

1984 ◽  
Vol 62 (3) ◽  
pp. 230-238 ◽  
Author(s):  
M. Irfan ◽  
H. Khushnood ◽  
A. Shakeel ◽  
A. R. Khan ◽  
M. Shafi
Keyword(s):  
Long Range ◽  
Short Range ◽  
Dominant Role ◽  
Cluster Formation ◽  
Pseudorapidity Distribution ◽  
Appreciable Change ◽  
Long Range Correlations ◽  
Rapidity Gap ◽  
Rapidity Distributions ◽  
Short Range Correlations

From the study of the pseudorapidity, η, distributions of charged shower particles produced in 50 GeV/c π− – nucleus and 400 GeV/c proton (p)–nucleus collisions, and their dependence on various parameters, the maxima of η distributions are noticed to shift towards smaller values of η with increasing Ng. Bimodality in the η distributions for all Ng groups has been observed to be completely absent in 50 GeV/c π− – nucleus interactions. Furthermore, the value of [Formula: see text] is found to decrease monotonically with increasing Ng, Ns, and Nh. The dispersions of the rapidity distributions D(η) do not, however, demonstrate any tendency of appreciable change with increasing Ng, except in the region of small Ng values. Finally, study of rapidity-gap length distributions reveals that the two-particle short-range correlations play a dominant role while the contribution of long-range correlations seems to be quite small.

Rapidity distributions and rapidity–gap correlations in multiparticle production at 50 and 400 GeV/c

1985 ◽  
Vol 63 (4) ◽  
pp. 466-471 ◽  
Author(s):  
S. Ahmad ◽  
H. Ahrar ◽  
M. Zafar ◽  
M. Shafi
Keyword(s):  
Single Particle ◽  
Short Range ◽  
Charged Particles ◽  
Projectile Fragmentation ◽  
Proton Collisions ◽  
Secondary Particles ◽  
Target Mass ◽  
Rapidity Gap ◽  
Rapidity Distributions ◽  
Short Range Correlations

Results on the single particle rapidity distributions and rapidity–gap correlations among hadrons produced in 50 GeV/c π−-meson and 400 GeV/c proton collisions with emulsion nuclei have been investigated. Study of the rapidity distributions reveals that the projectile fragmentation is mass independent and the target fragmentation depends upon the target mass. From the rapidity–gap distributions, we find evidence for short-range correlations that indicate that the secondary particles are produced via cluster formations and each cluster should consist of at least three charged particles.

scholarly journals LONG-RANGE FRACTAL CORRELATIONS IN LITERARY CORPORA

Fractals ◽  
2002 ◽  
Vol 10 (04) ◽  
pp. 451-461 ◽  
Author(s):  
MARCELO A. MONTEMURRO ◽  
PEDRO A. PURY
Keyword(s):  
Long Range ◽  
Short Range ◽  
Fractal Structure ◽  
Written Language ◽  
Long Range Correlations ◽  
Large Samples ◽  
Sentence Level ◽  
Set Up ◽  
Short Range Correlations ◽  
Linguistic Basis

In this paper, we analyze the fractal structure of long human language records by mapping large samples of texts onto time series. The particular mapping set up in this work is inspired on linguistic basis in the sense that is retains the word as the fundamental unit of communication. The results confirm that beyond the short-range correlations resulting from syntactic rules acting at sentence level, long-range structures emerge in large written language samples that give rise to long-range correlations in the use of words.

scholarly journals Basic features of correlated ion stopping in plasmas

1996 ◽  
Vol 14 (4) ◽  
pp. 749-763 ◽  
Author(s):  
Günter Zwicknagel ◽  
Claude Deutsch
Keyword(s):  
Long Range ◽  
Correlation Length ◽  
Short Range ◽  
Single Individual ◽  
Screening Length ◽  
Long Range Correlations ◽  
Ion Clusters ◽  
Large Ratio ◽  
Basic Features ◽  
Short Range Correlations

We reconsider correlated ion stopping in plasmas with the aim to emphasize the basic features and their underlying physics. For a better understanding of the effects connected with correlated ion stopping, it is useful to distinguish two types of correlated ion stopping, characterized by a small or large ratio of the correlation length of the ions to the screening length in the plasma. These two types of correlated ion stopping are of rather different character. We describe and explain these differences and give some generic examples of ion structures and ion clusters to demonstrate the basic features of both types of correlated stopping. This shows that only the short-range correlations always yield an enhanced stopping, whereas the long-range correlations, in general, reduce the stopping compared to single, individual ions. We mainly consider classical plasmas; the basic features, however, remain unchanged for a jellium target as well as for a plasma at any degeneracy.

scholarly journals Effects of Short and Long Range Correlations on the Charge Densities and Radii of Ca Nuclei

2019 ◽  
Vol 7 ◽  
pp. 47
Author(s):  
G. A. Lalazissis ◽  
S. E. Massen
Keyword(s):  
Experimental Data ◽  
Long Range ◽  
Short Range ◽  
Proton Density ◽  
Nuclear Surface ◽  
Combined Effects ◽  
Mean Square ◽  
Long Range Correlations ◽  
Charge Densities ◽  
Short Range Correlations

The experimental data for the charge (proton) density differences of the even Ca nuclei is analyzed by means of a simple phenomenological model where the effects of certain type short and long range correlations have been accounted. Short range correlations are approximated through the Jastrow type correlation function while for long range correlations the fluctuations of the nuclear surface are considered. The analysis shows that the combined effects of these correlations lead to a better description of the experimental charge (proton) density differences. Moreover, the calculated charge mean square radii of the even Ca nuclei exhibit a parabolic behaviour and compare well with the experimental isotope shifts from the laser spectroscopy measurements.

Correlations among relativistic charged secondaries produced in π−–nucleus interactions at 340 GeV/c

1990 ◽  
Vol 68 (10) ◽  
pp. 1207-1212
Author(s):  
Tauseef Ahmad ◽  
M. Irfan ◽  
M. Z. Ahsan
Keyword(s):  
Long Range ◽  
Short Range ◽  
Target Size ◽  
Nuclear Target ◽  
Plateau Region ◽  
Central Plateau ◽  
Long Range Correlations ◽  
Excess Number ◽  
Short Range Correlations ◽  
Number Of Particles

Correlations amongst fast charged secondaries produced in 340 GeV π−–nucleus collisions are examined. The findings of these investigations reveal that strong short-range correlations occur in the central plateau region; there is, however, no evidence for the presence of intrinsic long-range correlations. A backward asymmetry in the case of a nuclear target, which increases with increasing target size, is also observed. There are strong two-particle correlations in both forward and backward hemispheres and the excess number of particles that appear in the backward hemisphere due to heavier targets are envisaged to be produced through the decay of clusters.

scholarly journals UNDERSTANDING THE PARTICLE PRODUCTION MECHANISM WITH CORRELATION STUDIES USING LONG AND SHORT RANGE CORRELATIONS

2007 ◽  
Vol 16 (07n08) ◽  
pp. 2210-2215 ◽  
Author(s):  
◽  
B. K. SRIVASTAVA ◽  
R. P. SCHARENBERG ◽  
T. J. TARNOWSKY
Keyword(s):  
Long Range ◽  
Short Range ◽  
Particle Production ◽  
Parton Model ◽  
Color Glass ◽  
Long Range Correlations ◽  
Correlation Studies ◽  
Partonic Matter ◽  
Short Range Correlations ◽  
Star Detector

Long range forward-backward multiplicity correlations have been measured with the STAR detector for Au + Au collisions at [Formula: see text]. Strong long range correlations are observed in central Au + Au collisions. Based on the Dual Parton model and Color Glass Condensate considerations the data suggests that these long range correlations are due to multiple parton interactions. This suggests that dense partonic matter is created in central Au + Au collisions at [Formula: see text].

Analytical and empirical fluctuation functions of the EEG microstate random walk - Short-range vs. long-range correlations

NeuroImage ◽  
2016 ◽  
Vol 141 ◽  
pp. 442-451 ◽  
Author(s):  
F. von Wegner ◽  
E. Tagliazucchi ◽  
V. Brodbeck ◽  
H. Laufs
Keyword(s):  
Random Walk ◽  
Long Range ◽  
Short Range ◽  
Long Range Correlations

scholarly journals Scattering and Its Applications to Various Atomic Processes: Elastic Scattering, Resonances, Photoabsorption, Rydberg States, and Opacity of the Atmosphere of the Sun and Stellar Objects

Atoms ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 78
Author(s):  
Anand K. Bhatia
Keyword(s):  
Elastic Scattering ◽  
Long Range ◽  
Short Range ◽  
Bound States ◽  
Rydberg States ◽  
Stellar Atmospheres ◽  
Electron Systems ◽  
Short Range Correlations ◽  
Hybrid Theory ◽  
Scattering Resonances

A scattering process can be a natural process or a process carried out in a laboratory. The scattering of particles from targets has resulted in important discoveries in physics. We discuss various scattering theories of electrons and positrons and their applications to elastic scattering, resonances, photoabsorption, excitation, and solar and stellar atmospheres. Among the most commonly employed approaches are the Kohn variational principle, close-coupling approximation, method of polarized orbitals, R-matrix formulation, and hybrid theory. In every formulation, an attempt is made to include exchange, long-range and short-range correlations, and to make the approach variationally correct. The present formulation, namely, hybrid theory, which is discussed in greater detail compared to other approximations, includes exchange, long-range correlations, and short-range correlations at the same time, and is variationally correct. It was applied to calculate the phase shifts for elastic scattering, the resonance parameters of two-electron systems, photoabsorption in two-electron systems, excitation of atomic hydrogen by an electron and positron impact, and to study the opacity of the Sun’s atmosphere. Calculations of polarizabilities, Rydberg states, and bound states of atoms are also discussed.

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