Speaker
Description
Abstract: Multiparticle production process in hadron-nucleus (hA) and nucleus-nucleus ( AA) collision has been studied throughly in the last four decades. Main aim of the study of AA collision is to investigate the properties of QGP. There are many signatures of QGP, one of the method to study this is fluctuations in the particle density. Fluctuation in the individual events may gives rise peaks in the phase space domains. These may be studies by the method of scaled factorial moments of the multiplicity distribution.
The concept of intermittency is connected to the fractal geometry of the underlying physical process. Fractal geometry allows us to describe a system that is intrinsically irregular at all scales. A fractal structure has the property that if one magnifies a small portion of it that shows the same complexity as which system. The idea, therefore, is to construct a formalism that can describe systems with local properties of self-similarity. They have suggested that if intermittency exists, then the normalized factorial moments of the multiplicity distribution should exhibit a characteristic power-law dependence or scale invariance. Many referres have done the similar work to show the presence of intermittency . The intermittency may be due to the self-similar and fractal structure of the particle production in nuclear collisions.
Analysis of Scaled Factorial Moment (SFM) has been done for the order of the moment, $q$ = 2-5 in order to study the intermittent behaviour of particle produced in 14.5A Gev/c, $^{28}$Si-AgBr collisions.
The events generated from Heavy Ion Jet Interaction Generator (HIJING) model and Ultra relativistic Quantum Molecular Dynamics (UrQMD) model.
The experimental results are also compared with those obtained for the simulated events. The variation of anomalous dimension, $d_q$, and parameter, $%lambda_q$ related to the non-thermal phase transition with the order of moment, $q$ has been studied. We have calculated scaling index, $%nu$ and found that it’s values are close to the predicted value. This confirms that the phase transition is of the second order. It is also found that $\langle F_{q}\rangle$ exhibits power-law behaviour at small bin sizes. It shows that intermittency takes place in multiparticle production.
| Session | Heavy Ions and QCD |
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