Fractality of emission of compound multiplicity in 12C–AgBr interactions at 4.5A GeV

2007 ◽  
Vol 85 (4) ◽  
pp. 385-392 ◽  
Author(s):  
D Ghosh ◽  
A Deb ◽  
S Biswas ◽  
P Mandal ◽  
P Kr. Haldar
Keyword(s):  
Particle Production ◽  
Azimuthal Angle ◽  
High Energy ◽  
Emission Angle ◽  
Nuclear Collisions ◽  
Compound Multiplicity ◽  
Generalized Dimensions ◽  
Multifractal Nature

This paper presents a fractality analysis of the compound multiplicity (pions + target protons) distribution in 12C–AgBr interactions at 4.5A GeV in terms of moments proposed by Takagi (Phys. Rev. Lett. 72, 32 (1994)) for both emission-angle (θ) and azimuthal-angle (ϕ) space. The generalized dimensions Dq, q = 1 to 5, have been calculated and compared to other studies. The analysis reveals the multifractal nature of particle production as a common feature of emission of different patterns in high-energy nuclear collisions. PACS Nos.: 25.75–q, 24.60 Ky

LÉVY INDEX AND MULTIFRACTAL CHARACTERISTICS OF RING-LIKE AND JET-LIKE EVENTS IN HIGH ENERGY NUCLEAR COLLISIONS

Fractals ◽  
2010 ◽  
Vol 18 (01) ◽  
pp. 75-86
Author(s):  
DIPAK GHOSH ◽  
ARGHA DEB ◽  
PRABIR KUMAR HALDAR ◽  
SIMA GUPTAROY ◽  
APARNA DHAR (MITRA)
Keyword(s):  
Nuclear Emulsion ◽  
Azimuthal Angle ◽  
Factorial Moment ◽  
High Energy ◽  
Emission Angle ◽  
Two Dimensional ◽  
Nuclear Collisions ◽  
A Value ◽  
Index Analysis ◽  
Angle Space

We perform a Lévy index analysis of relativistic shower particles produced in the interactions of 32 S nuclei at 200A GeV with nuclear emulsion using the results of factorial moment Fq in two-dimensional anisotropic (η - ϕ) space. We carry out the same investigation for target fragments produced in 32 S - AgBr interactions at 200A GeV energy for both events in emission angle space and azimuthal angle space. The analysis reveals that for pions the value of Lévy index μ is 1.491 ± 0.025 for ring-like events and μ ~ 2.004 ± 0.054 for jet-like events which indicates different degree of multifractality. In case of target fragments jet-like events show a value of μ ~ 1.871 ± 0.010 whereas ring-like events yields an unphysical value (μ > 2) the implication of which need to be explored.

EVIDENCE OF FRACTAL BEHAVIOR OF PIONS AND PROTONS IN HIGH ENERGY INTERACTIONS — AN EXPERIMENTAL INVESTIGATION

Fractals ◽  
2005 ◽  
Vol 13 (04) ◽  
pp. 325-339 ◽  
Author(s):  
DIPAK GHOSH ◽  
ARGHA DEB ◽  
SITARAM PAL ◽  
PRABIR KUMAR HALDAR ◽  
SWARNAPRATIM BHATTACHARYYA ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Specific Heat ◽  
Multiplicity Distribution ◽  
Azimuthal Angle ◽  
Factorial Moment ◽  
Fractal Dimensions ◽  
High Energy ◽  
Emission Angle ◽  
Compound Multiplicity ◽  
Multifractal Behavior

Different fractal methods (Factorial moment, Takagi moment) have been used for the analysis of fractal behavior of multiparticle production in π-- AgBr interaction at 350 GeV/c of compound multiplicity distribution in emission angle (cos θ) space and azimuthal angle (ϕ) space. The generalized fractal dimensions Dq are determined according to two methods. Results indicate multifractal behavior in compound multiplicity distribution. From the knowledge of Dq, the multifractal specific heat is calculated. Results are compared with the corresponding results of shower multiplicity.

Possibility of H-particle production in high-energy nuclear collisions

1989 ◽  
Vol 224 (4) ◽  
pp. 359-363 ◽  
Author(s):  
M. Sano ◽  
M. Wakai ◽  
H. Bandō
Keyword(s):  
Particle Production ◽  
High Energy ◽  
Nuclear Collisions

scholarly journals Particle Production at High Energy: DGLAP, BFKL and Beyond

Universe ◽  
2019 ◽  
Vol 5 (2) ◽  
pp. 64 ◽  
Author(s):  
Jamal Jalilian-Marian
Keyword(s):  
Evolution Equation ◽  
Particle Production ◽  
Evolution Equations ◽  
High Energy ◽  
Color Glass ◽  
Collinear Factorization ◽  
Perturbative Quantum Chromodynamics ◽  
Nuclear Collisions ◽  
Perturbative Quantum ◽  
Regge Limit

Particle production in high energy hadronic/nuclear collisions in the Bjorken limit Q 2 , s → ∞ can be described in the collinear factorization framework of perturbative Quantum ChromoDynamics (QCD). On the other hand in the Regge limit, at fixed and not too high Q 2 with s → ∞ , a k ⊥ factorization approach (or a generalization of it) is the appropriate framework. A new effective action approach to QCD in the Regge limit, known as the Color Glass Condensate (CGC) formalism, has been developed which allows one to investigate particle production in high energy collisions in the kinematics where collinear factorization breaks down. Here we give a brief overview of particle production in CGC framework and the evolution equation which governs energy dependence of the observables in this formalism. We show that the new evolution equation reduces to previously known evolution equations in the appropriate limits.

Fractal study of pion void probability distribution in ultrarelativistic nuclear collision and its target dependence

2016 ◽  
Vol 31 (27) ◽  
pp. 1650158 ◽  
Author(s):  
Susmita Bhaduri ◽  
Dipak Ghosh
Keyword(s):  
Probability Distribution ◽  
Production Process ◽  
Particle Production ◽  
Azimuthal Angle ◽  
High Energy ◽  
Nuclear Collision ◽  
Visibility Graph ◽  
Scaling Behavior ◽  
200 Gev ◽  
Visibility Graph Analysis

There are numerous existing works on investigating the dynamics of particle production process in ultrarelativistic nuclear collision. In the past, fluctuation of spatial pattern has been analyzed in terms of the scaling behavior of voids. But analysis of the scaling behavior of the void in fractal scenario has not been explored yet. In this work, we have analyzed the fractality of void probability distribution with a completely different and rigorous method called visibility graph analysis, analyzing the void-data produced out of fluctuation of pions in [Formula: see text]S–AgBr interaction at 200 GeV in pseudo-rapidity [Formula: see text] and azimuthal angle [Formula: see text] space. The power of scale-freeness of visibility graph denoted by PSVG is a measure of fractality, which can be used as a quantitative parameter for the assessment of the state of chaotic system. As the behavior of particle production process depends on the target excitation, we can dwell down the void probability distribution in the event-wise fluctuation resulted out of the high energy interaction for different degree of target excitation, with respect to the fractal scenario and analyze the scaling behavior of the voids. From the analysis of the PSVG parameter, we have observed that scaling behavior of void probability distribution in multipion production changes with increasing target excitation. Since visibility graph method is a classic method of complex network analysis, has been applied over fractional Brownian motion (fBm) and fractional Gaussian noises (fGn) to measure the fractality and long-range dependence of a time series successfully, we can quantitatively confirm that fractal behavior of the void probability distribution in particle production process depends on the target excitation.

Evidence of Intermittent Type Fluctuation of Target Residue in Relativistic Nuclear Collisions at a Few Gev/n

2003 ◽  
Vol 12 (03) ◽  
pp. 407-419 ◽  
Author(s):  
Dipak Ghosh ◽  
Argha Deb ◽  
Swarnapratim Bhattacharyya ◽  
Jayita Ghosh Rupa Das ◽  
Sima Mukherjee
Keyword(s):  
Fractal Dimension ◽  
Energy Dependence ◽  
Dimensional Space ◽  
Azimuthal Angle ◽  
Emission Angle ◽  
Two Dimensions ◽  
Two Dimensional ◽  
Nuclear Collisions ◽  
Angle Space ◽  
Relativistic Nuclear Collisions

This paper presents evidence of intermittency in target fragmentation in 28Si-AgBr interactions at 14.5 AGeV in emission angle space and azimuthal angle space separately and also in two-dimensional (cos θ,ϕ) space. From the intermittency exponent, the anomalous fractal dimension dq is calculated and the variation of dq with the order q is investigated. The authors also compare the results with those obtained from 16O-AgBr interactions at 60 AGeV and at 2.1 AGeV and 32S-AgBr interactions at 200 AGeV to study the energy dependence of intermittent type of fluctuations in emission angle and azimuthal angle space separately. Comparing the intermittency exponents in one- and two-dimensions it is further seen that intermittency exponent has a higher value in two-dimensional space.

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