Quark-hadron phase transition study in hadron-nucleus interactions in self-affine scaling scenario

• Main Author: Sitaram Pal
• Format: Article
• Language: English
• Published: L.N. Gumilyov Eurasian National University 2018-03-01
• Series: Eurasian Journal of Physics and Functional Materials
• Subjects: hadron-nucleus interaction; phase transition; target excitation; Levy index; Ginzburg – Landau theory; self-affine scaling
• Online Access: http://ephys.kz/files/2018-03-26_Vol.2_Num.1_4.pdf

In the present work the phase transition and its dependence on target excitation has been studied in two dimensional ( η − φ ) self affine space using the experimental data of pions obtained from π − -AgBr interactions at 350 GeV/c. For studying target excitation dependence the data for produced pions are divided into three sets depending on the number of grey particles ( ng ). The different sets corresponds to the different degrees of target excitation. The Levy indices µ measured from the analysis fulfills the requirement of the levy stable region 0 ≤ µ ≤ 2 . The Levy index µ <1 indicates that a thermal phase transition may exist in the π − -AgBr interactions at 350 GeV/c. Further the analysis indicates different degrees of multifractality for different target excitation. Moreover, the value of universal scaling exponent ( ν ) obtained from Ginzburg-Landau (GL) theory indicates that no evidence of second order phase transition has been found in the interaction.