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Summer Research Fellowship Programme of India's Science Academies

Insight into charged particle production mechanism using AMPT model for different collision systems at LHC energies

Anaswara Ramachandran

Integrated M.Sc Physics, Central University of Tamilnadu, CUTN Bridge, Neelakudy, Tamil Nadu 610005

Dr. Raghunath Sahoo

Department of physics, Indian Institute of Technology, Indore, Madhyapradesh

Abstract

There are various types of models available for this and AMPT [A multi-phase transport model] is one among them which can treat the chemical and thermal freeze out. AMPT includes both initial partonic and final hadronic interactions and transition between these two phases of matter. There are two types of AMPT models; Default and string melting versions. The major differences between these two are the hadronization processes. In default model it occurs by Lund string fragmentation and in string melting it occurs by quark coalescence. In this work, the collision of heavy ions such as XeXe [xenon-xenon], Pb-Pb [lead-lead], Au-Au [gold-gold] at high energies 200 GeV to 5500 GeV are simulated. Rapidity distribution, pseudo rapidity distribution, transverse momentum and azimuthal angle distribution are studied using string melting version and default version. We also compared the differences and similarities of pseudo rapidity and rapidity [y]. Beam rapidity [yb] of various colliding system like Xe-Xe, Pb-Pb, Au-Au are obtained along with the loss in rapidity [y-yb]. We also studied dependence of rapidity and transverse energy [ET] distribution of charged particles of above colliding system with loss in rapidity for various colliding energies. We have also studied limiting fragmentation which is an interesting phenomenon in high energy multiparticle production.

Keywords: AMPT, rapidity, pseudo rapidity, beam rapidity, transverse energy

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