Geometrical scaling for energies available at the BNL Relativistic Heavy Ion Collider to those at the CERN Large Hadron Collider

2018/05/31 by M. Petrovici, A. Lindner, A. Pop +3
Physics and Astronomy · #Geometry #Hadron #Heavy ion #High-Energy Particle Collisions Research #Ion #Large Hadron Collider #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Scaling #hep-ph #msc:21.65.Qr #msc:25.75.Ld #msc:25.75Ag #msc:25.75Nq #nucl-th

paper · pdf · doi:10.1103/physrevc.98.024904

published as Phys. Rev. C 98, 024904 (2018)

arxiv created 2018/07/12 · openalex created_date 2018/07/19 · openalex publication_date 2018/08/07 · arxiv updated 2018/08/15 · openalex updated_date 2026/08/05

Abstract

Based on recent experimental results at the BNL Relativistic Heavy Ion Collider (RHIC) and the CERN Large Hadron Collider (LHC), the \ensuremath⟨p_T\ensuremath⟩ dependence of identified light flavor charged hadrons on √((dN)/(dy))/S_\ensuremath⊥\phantom², the relevant scale in the gluon saturation picture, is studied from √s_NN=7.7 GeV up to 5.02 TeV. This study is extended to the slopes of the \ensuremath⟨p_T\ensuremath⟩ dependence on the particle mass and the \ensuremath⟨\ensuremathβ_T\ensuremath⟩ parameter from Boltzmann-Gibbs blast wave (BGBW) fits of the p_T spectra. A systematic decrease of the slope of the \ensuremath⟨p_T\ensuremath⟩ dependence on √((dN)/(dy))/S_\ensuremath⊥\phantom² from Beam Energy Scan (BES) to LHC energies is evidenced. While, for the RHIC energies, within the experimental errors, \ensuremath⟨p_T\ensuremath⟩/√((dN)/(dy))/S_\ensuremath⊥\phantom² does not depend on centrality, at the LHC energies a deviation from a linear behavior is observed towards the most central collisions. The influence of the corona contribution on the observed trends is discussed. The slopes of the \ensuremath⟨p_T\ensuremath⟩ particle mass dependence and the \ensuremath⟨\ensuremathβ_T\ensuremath⟩ parameter from BGBW fits scale well with √((dN)/(dy))/S_\ensuremath⊥\phantom². Similar systematic trends for pp at √(s)=7 TeV are in a good agreement with the ones corresponding to Pb-Pb collisions at √s_NN=2.76 and 5.02 TeV, pointing to a system-size-independent behavior.

Citations

• Importance of correlations and fluctuations on the initial source eccentricity in high-energy nucleus-nucleus collisions
• Transverse momentum of protons, pions and kaons in high multiplicity pp and pA collisions: Evidence for the color glass condensate?
• Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC
• Geometrical scaling and the dependence of the average transverse momentum on the multiplicity and energy for the ALICE experiment