Abstract
The dependence on centrality, or on the number of nucleon participants, of the midrapidity density of charged particles measured in heavy-ion collisions at the collision energy of about 20 GeV at RHIC to the highest LHC energy of 5 TeV is investigated within the recently proposed effective-energy approach. This approach relates multihadron production in different types of collisions by combining, under the proper scaling of the collision energy, the constituent quark picture with Landau relativistic hydrodynamics. The measurements are shown to be well described based on the similarity of multihadron production process in (anti)proton-proton interactions and heavy-ion collisions driven by the centrality-dependent effective energy of participants.
Highlights
RAPID COMMUNICATIONSThe dependence on centrality, or on the number of nucleon participants, of the midrapidity density of charged particles measured in heavy-ion collisions at the collision energy of about 20 GeV at RHIC to the highest LHC energy of 5 TeV is investigated within the recently proposed effective-energy approach
The measurements are shown to be well described based on the similarity of multihadron production process inproton-proton interactions and heavy-ion collisions driven by the centralitydependent effective energy of participants
We have shown that the multiplicity [1] and midrapidity density [2] data from heavy-ion collisions in the collision energy range of several orders of magnitude are well described in the framework of the picture of the dissipating effective energy of constituent quark participants [3,4], or, for brevity, the effective-energy approach
Summary
The dependence on centrality, or on the number of nucleon participants, of the midrapidity density of charged particles measured in heavy-ion collisions at the collision energy of about 20 GeV at RHIC to the highest LHC energy of 5 TeV is investigated within the recently proposed effective-energy approach This approach relates multihadron production in different types of collisions by combining, under the proper scaling of the collision energy, the constituent quark picture with Landau relativistic hydrodynamics. We show that the recent measurements of the centrality dependence of the pseudorapidity midrapidity density of charged particles in PbPb collisions by ALICE [p5ffis]ffi,ffiNffiaffiNffitffi,theveehrigrehaecshtecde,nntearm-oefl-ymaatsps (ffisfficffiNffi.ffimNffiffi .1⁄4) e5n.e0r2gyTpeeVr ,naurceleaolsno, well described using the effective-energy approach This approach interrelates the particle production process in different types of collisions [3], as briefly described below. Ð2=NpartÞdNch=dη (η ≈ 0), in heavy-ion collisions and in pp=pp interactions: sffiffiffiffiffiffiffiffi ρð0Þ ρppð0Þ
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