Different void fluctuation in ring-like events and jet-like events in 16O–AgBr interactions at 60 AGeV

2014 ◽  
Vol 23 (11) ◽  
pp. 1450067 ◽  
Author(s):  
M. Mondal ◽  
S. Biswas Ghosh ◽  
A. Mondal ◽  
D. Ghosh ◽  
A. Deb
Keyword(s):  
Phase Transition ◽  
Production Process ◽  
Dimensional Analysis ◽  
High Energy ◽  
Two Dimensional ◽  
Hadron Phase ◽  
High Energy Collisions ◽  
Two Parameters

This paper reports a study of fluctuations and possible signature of quark–hadron phase transition in high energy collisions. The study is based on the ring-like and jet-like events for pions produced in 16 O – AgBr interactions at 60 AGeV. We have performed two-dimensional analysis (η-φ space) of fluctuation of voids for two types of azimuthal substructures of produced pions (ring-like and jet-like) following connecting void approach given by R. C. Hwa and Q. H. Zhang. The values of two parameters "c" and "s" reveal different void pattern fluctuation in ring-like and jet-like events, which hints toward different mechanism in their production process.

scholarly journals Intermittency in high-energy collisions and a phase transition in the Feynman-Wilson fluid

1992 ◽  
Vol 45 (11) ◽  
pp. 4034-4045 ◽  
Author(s):  
N. G. Antoniou ◽  
A. P. Contogouris ◽  
C. G. Papadopoulos ◽  
S. D. P. Vlassopulos
Keyword(s):  
Phase Transition ◽  
High Energy ◽  
High Energy Collisions

scholarly journals POSSIBLE DYNAMICAL ORIGINS OF INTERMITTENCY IN HIGH ENERGY COLLISIONS

1994 ◽  
Vol 09 (10) ◽  
pp. 863-874 ◽  
Author(s):  
RUDOLPH C. HWA
Keyword(s):  
Phase Transition ◽  
Monte Carlo ◽  
Perturbative Qcd ◽  
High Energy ◽  
Elementary Processes ◽  
Nuclear Collisions ◽  
Complex Processes ◽  
High Energy Collisions

This is a brief review of the dynamical origins of intermittency. For elementary processes involving leptons and hadrons, we discuss toy models, perturbative QCD, Monte-Carlo and other models. For complex processes involving nuclear collisions we review theoretical ideas on hadronic fluctuations as consequences of phase transition.

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

2008 ◽  
Vol 86 (12) ◽  
pp. 1449-1459 ◽  
Author(s):  
D Ghosh ◽  
A Deb ◽  
S Pal ◽  
J Ghosh
Keyword(s):  
Phase Transition ◽  
Phase Space ◽  
Production Process ◽  
Hurst Exponent ◽  
Factorial Moment ◽  
Multiparticle Production ◽  
Two Dimensional ◽  
Dimensional Phase Space ◽  
Compound Multiplicity ◽  
Multiplicity Distributions

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

scholarly journals Reduction of Sound Speed during Cosmological First Order Phase Transition

1999 ◽  
Vol 183 ◽  
pp. 313-313
Author(s):  
M. Nagasawa ◽  
J. Yokoyama
Keyword(s):  
Phase Transition ◽  
Sound Speed ◽  
Second Law Of Thermodynamics ◽  
High Energy ◽  
Mean Value ◽  
Bubble Nucleation ◽  
Energy Fraction ◽  
Speed Reduction ◽  
First Order ◽  
Hadron Phase

The degree of sound speed reduction is estimated during the coexistence epoch of quark-gluon and hadron phases in the first-order QCD phase transition[1]. The sound speed in a mixture is obtained by simply replacing the energy density with the mean value in the usual formula[2]. Since the adiabatic condition is nothing but the second law of thermodynamics which is useless for the purpose of calculating the sound speed qualitatively, we adopt the conservation of the quality which is the energy fraction of the high-energy phase[2]. This is appropriate because the transition of the phases through bubble nucleation is totally suppressed at the coexistence temperature and the expansion speed of bubbles is so small that energy transfer through bubble expansion or contraction is also expected to be negligible during sound-wave propagation. Using the bag model, the numerical value of the minimum sound speed can be calculated as where the uncertainty comes from the selection of the number of relativistic quark species. Thus we can say that the quark-hadron phase transition has no drastic effect on the development of cosmological density perturbations.

scholarly journals AZIMUTHAL CORRELATION FOR COHERENT SOURCES IN PHASE TRANSITION

1994 ◽  
Vol 09 (37) ◽  
pp. 3495-3503
Author(s):  
RUDOLPH C. HWA ◽  
C.S. LAM
Keyword(s):  
Phase Transition ◽  
Azimuthal Angle ◽  
High Energy ◽  
Transverse Plane ◽  
Azimuthal Correlation ◽  
Particle Correlation ◽  
Nuclear Collisions ◽  
Hadron Phase ◽  
Correlation Problem ◽  
Coherent Sources

We present a formulation of the correlation problem in the transverse plane of high-energy nuclear collisions. The correlation variable is the azimuthal angle between two transverse momenta. We assume that the effects of quark-hadron phase transition are manifested in the existence of a coherence angle χ and a parameter ε characterizing the irreducible correlation. We then derive the consequences on the observable two-particle correlation function.

scholarly journals Recognizing Critical Behavior amidst Minijets at the Large Hadron Collider

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Rudolph C. Hwa
Keyword(s):  
Phase Transition ◽  
Critical Behavior ◽  
Hadron Collider ◽  
Nonlocal Problem ◽  
Heavy Ion ◽  
High Energy ◽  
Near Neighbor ◽  
Azimuthal Anisotropy ◽  
Hadron Phase ◽  
Local Point

The transition from quarks to hadrons in a heavy-ion collision at high energy is usually studied in two different contexts that involve very different transverse scales: local and nonlocal. Models that are concerned with thepTspectra and azimuthal anisotropy belong to the former, that is, hadronization at a local point in(η,ϕ)space, such as the recombination model. The nonlocal problem has to do with quark-hadron phase transition where collective behavior through near-neighbor interaction can generate patterns of varying sizes in the(η,ϕ)space. The two types of problems are put together in this paper both as brief reviews separately and to discuss how they are related to each other. In particular, we ask how minijets produced at LHC can affect the investigation of multiplicity fluctuations as signals of critical behavior. It is suggested that the existing data from LHC have sufficient multiplicities in smallpTintervals to make the observation of distinctive features of clustering of soft particles, as well as voids, feasible that characterize the critical behavior at phase transition from quarks to hadrons, without any ambiguity posed by the clustering of jet particles.

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