Event multiplicity, transverse momentum and energy dependence of charged particle production, and system thermodynamics in pp collisions at the Large Hadron Collider. (3rd April 2020)

• Record Type: Journal Article
• Authors: Rath, Rutuparna; Khuntia, Arvind; Sahoo, Raghunath; Cleymans, Jean
• Is Part Of: Journal of physics. Volume 47:Number 5(2020:May)
• Publication Date: 2020-04-03
• Subjects: particle spectra -- non-extensive statistics -- Boltzmann–Gibbs blast wave -- proton+proton collisions -- multiplicity dependence -- kinetic freeze-out; Nuclear physics -- Periodicals; Particles (Nuclear physics) -- Periodicals; Physique nucléaire -- Périodiques; Particules (Physique nucléaire) -- Périodiques; Kernfysica; Elementaire deeltjes; 539.7
• DOI: 10.1088/1361-6471/ab783b
• Languages: English
• ISSNs: 0954-3899

Abstract

Abstract: In the present work, we study the recent collision energy and multiplicity dependence of the charged particle transverse momentum spectra as measured by the ALICE collaboration in pp collisions at s = 5.02 and 13 TeV using the non-extensive Tsallis distribution and the Boltzmann–Gibbs blast wave (BGBW) model. A thermodynamically consistent form of the Tsallis distribution is used to extract the kinetic freeze-out parameters from the transverse momentum spectra of charged particles at mid-rapidity. In addition, a comprehensive study of fitting range dependence of transverse momentum spectra on the freeze-out parameters is done using Tsallis statistics. The applicability of BGBW model is verified by fitting the transverse momentum spectra of the bulk part (∼2.5 GeV/ c ) for both 5.02 and 13 TeV energies and also in different multiplicity classes. The radial flow, ⟨ β ⟩ is almost independent of collision energy and multiplicity whereas the behavior of kinetic freeze-out temperature significantly depends on multiplicity classes. It is found that the Tsallis distribution generally leads to a better description for the complete transverse momentum spectra whereas the BGBW model explains the bulk part of the system.