INTERMITTENCY IN 4.5A AND 14.5A GeV/c28Si-NUCLEUS INTERACTIONS

Bari, W.; Ahmad, N.; Khan, M. Mohisin; Ahmad, Shakeel; Zafar, M.; Irfan, M.

doi:10.1142/s0218301302000740

Cited by 25 publications

(12 citation statements)

References 21 publications

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“…The events were searched by the method of line scanning and the space angles of the produced particles, θ s , were measured using the coordinate method. The other relevant details regarding scanning procedure, criteria for selecting events, method of measurements, etc., may be found in the book by Powell et al [41] and our earlier publications [42][43][44]. A random sample comprising 605 interactions having n h ≥0, where n h represents the number of charged particles produced in an interaction with relative velocities β ≤ 0.7, are analysed.…”

Section: A Brief Description Of the Data Samplementioning

confidence: 99%

Study of Anomalous Fractal Dimensions and Scaling Exponent in Ginzburg--Landau Phase Transition in 14.5 $A$\,GeV/$c$ $^{28}$Si--AgBr Interactions

Kamal¹,

Ahmad²,

Khan³

2015

Acta Phys. Pol. B

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In this paper, multiplicity distributions of charged particles produced in 14.5 A GeV/c 28 Si-AgBr interactions and the events generated by Monte Carlo models, FRITIOF and HIJING, are analysed using Scaled Factorial Moments (SFMs) approach in terms of the Ginzburg-Landau formalism. The reported power-law behaviour of the higher-order and second-order scaled factorial moments is searched for in the experimental and simulated data. The analysis of anomalous fractal dimensions does not favour occurrence of any exotic phenomenon. Further, the values of the slopes, β q , are used to determine a universal scaling exponent, ν, for both the experimental and simulated data in terms of Ginzburg-Landau approach in order to investigate the nature of phase transition from the de-confined quarkgluon medium to the confined hadronic state. The analysis indicates that the values of ν for the experimental and FRITIOF data compare reasonably well with its critical value. Nevertheless, the value of ν for the HIJING data is in marked disagreement. This may be attributed to the fact that local fluctuations are not addressed effectively by HIJING model; however, it successfully explains the phenomenon of flow. Finally, some evidences regarding second-order phase transition are found.

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Section: A Brief Description Of the Data Samplementioning

confidence: 99%

Study of Anomalous Fractal Dimensions and Scaling Exponent in Ginzburg--Landau Phase Transition in 14.5 $A$\,GeV/$c$ $^{28}$Si--AgBr Interactions

Kamal¹,

Ahmad²,

Khan³

2015

Acta Phys. Pol. B

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“…A power law growth of scaled factorial moments (SFMs), F q , with decreasing phase space bin width, referred to as intermittency, emerged as a new tool to study the non-linear phenomena in hadronic and nuclear collisions at high energies [34,35,38,39,40]. This method of SFMs has been extensively used [41,42,43,44,45,46,47] to search for non-linear phenomena in high energy hadronhadron, hadron-nucleus and nucleus-nucleus collisions in a wide range of incident energy. Recently, SFMs have been used to study various processes at SPS and RHIC energies [48] with the aim to scan the phase diagram in a systematic search for the QCD critical point.…”

Section: Factorial Momentsmentioning

confidence: 99%

A study of event-by-event fluctuations in relativistic heavy-ion collisions

Ahmad

Khan

et al. 2014

Int. J. Mod. Phys. E

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A method for selecting events with densely populated narrow regions or spikes in a given data sample is discussed. Applying this method to 200 A GeV/c 32 S-AgBr and 32 S-Gold collision data, a few events having 'hot regions' are chosen for further analysis. The finding reveals that a systematic study of particle density fluctuations, if carried out in terms of scaled factorial moments, and the results are compared with those for the analysis of correlation free Monte Carlo events, would be useful in identifying events with large dynamical fluctuations. Formation of clusters or jet-like structure in multihadronic final states in the selected spiky events is also looked into and compared with the predictions of AMPT and independent emission hypothesis models by carrying out Monte Carlo simulation. The findings suggest that clustering or jet-like algorithm adopted in the present study may also serve as an important tool for triggering different classes of events.

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“…In ref. 25, the minimum should be searched for in different M ranges so as to probe different regimes of multihadron production at different scales as indicated by high-order factorial moments, a feature not observed in the full M range λ q studies where saturation is reached at certain q values [16,27,28]. Such minima in limited M ranges were indeed found in hadronic [29] and nuclear [25,30,31] collisions.…”

Section: Introductionmentioning

confidence: 97%

Self-affine fluctuations of pions and protons and nonthermal phase transition in hadron–nucleus interactions

Ghosh¹,

Deb²,

Pal³

et al. 2008

Can. J. Phys.

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The paper reports a study revealing self-affine fluctuations in pion, proton, and compound multiplicity (of pions combined with protons) spectra obtained from the interactions of 350 GeV pions with AgBr nuclei. The study is performed in the transformed two-dimensional phase space of the emission and azimuthal angles using the factorial moment methodology and the concept of the Hurst exponent. Evidence of a nonthermal phase transition is obtained for self-affine fluctuations of pions along with an indication for such a regime to be seen in similar fluctuations of proton and compound multiplicity distributions. The study bridges the anisotropic nature of the multiparticle production process and an evidence of the nonthermal phase transition with similar earlier findings from hadron-hadron and nucleus-nucleus interactions and shows the same effects to be peculiar features of the multiplicity distributions of the different species of particles produced. All this brings important information about the underlying dynamics of the hadroproduction process. PACS Nos.: 25.80.Hp, 24.60.Ky, 13.85.−t Résumé : Nous présentons une étude des fluctuations auto-affines dans les spectres de pions, protons et systèmes composés (des pions avec des protons) obtenues dans l'interaction de pions de 350 GeV sur des noyaux AgBr. Nous complétons cette étude en transformant l'espace de phase à deux dimensions des angles d'émission et azymutal en utilisant la méthode du moment factoriel et le concept de l'exposant de Hurst. Les résultats indiquent une transition de phase non thermique pour les fluctuations auto-affines des pions et suggèrent la même chose pour les protons et les systèmes composés.L'étude fait le pont entre la nature anisotrope des procédés de production multiparticules et l'évidence d'une transition de phase non thermique avec des résultats similaires pour des interactions hadron-hadron et noyau-noyau et montre que ces mêmes effets sont des caractéristiques particulières des distributions de multiplicité de différents types de particules produites. Tout ceci apporte un éclairage important sur la dynamique sous-jacente de production hadronique.[Traduit par la Rédaction]

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INTERMITTENCY IN 4.5A AND 14.5A GeV/c²⁸Si-NUCLEUS INTERACTIONS

Cited by 25 publications

References 21 publications

Study of Anomalous Fractal Dimensions and Scaling Exponent in Ginzburg--Landau Phase Transition in 14.5 $A$\,GeV/$c$ $^{28}$Si--AgBr Interactions

Study of Anomalous Fractal Dimensions and Scaling Exponent in Ginzburg--Landau Phase Transition in 14.5 $A$\,GeV/$c$ $^{28}$Si--AgBr Interactions

A study of event-by-event fluctuations in relativistic heavy-ion collisions

Self-affine fluctuations of pions and protons and nonthermal phase transition in hadron–nucleus interactions

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