A 'soft+hard' model for Pion, Kaon, and Proton Spectra and v2 measured in PbPb Collisions at = 2.76ATeV

Hot Quarks 2014: Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions

Barnaföldi, Gergely Gábor^1 ; Ürmössy, Károly^1 ; Bíró, Gábor^1,2

Wigner Research Center for Physics of the HAS, 29-33 Konkoly-Thege Miklós Str., Budapest

H-1121, Hungary^1

Loránd Eötvös University, 1/A Pazmany Peter Setany, Budapest

H-1117, Hungary^2

关键词: Azimuthal anisotropy;    Hadronization process;    Heavy ion collision;    High-energy collisions;    Pb-Pb collisions;    Quark-gluon plasma;    Theoretical development;    Transverse momenta;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/612/1/012048/pdf
DOI  :  10.1088/1742-6596/612/1/012048

来源: IOP

【 摘 要 】

Hadron spectra measured in high-energy collisions present distributions which can be derived from the non-extensive statistical and thermodynamical phenomena. Based on earlier theoretical developments, it seems, the methods are very applicable for jets hadronization processes in electron-positron, proton-proton, and even in heavy-ion collisions. Here, we present what can was learnt from the recent theoretical and phenomenological developments: transverse momentum spectra and azimuthal anisotropy (v2) of charge averaged pions, kaonsand protons stemming from central Pb+Pbcollisions at √s = 2.76 ATeV are described analytically in a 'soft + hard' model. In this model, we propose that hadron yields produced in heavy-ion collisions are simply the sum of yields stemming from jets (hard yields) in addition to the yields originating from the Quark-Gluon Plasma (soft yields). The hadron spectra in both types of yields are approximated by the Tsallis- Pareto like distribution.