Abstract
The transverse momentum spectra of seven identified hadrons produced in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ and 5.02 TeV at the CERN Large Hadron Collider (LHC) have been investigated in the framework of the recombination model (RM). Soft, semihard and hard partons all play important roles in our model and are uniformly treated for all hadrons produced.The investigation has been extended to non-central collisions and the parameters controlling the momentum degradation of semihard partons have been tuned. Our study shows good agreement between theoretical results and experimental data. To be able to provide a coherent explanation for the production of all identified hadrons ($\pi$, p, K, $\Lambda$, $\phi$, $\Xi$, $\Omega$) for transverse momenta as high as 14 GeV/c (for $\pi$, p and K), and for all centralities, is an unprecedented achievement that supports the RM as a sensible model to combine various mechanisms of parton production with a universal scheme of hadronization.
Highlights
The ultimate goal of the physics program with ultrarelativistic nucleus-nucleus collisions is to understand the properties of strongly interacting matter under extreme conditions of high temperature and density
It is found that the minijets are abundantly produced at the CERN Large Hadron Collider (LHC) compared with Relativistic Heavy Ion Collider (RHIC)
These previous studies [11,12] have revealed that the formation of hadrons at intermediate pT region is sensitive to the momentum degradation of the hard and semihard partons
Summary
The ultimate goal of the physics program with ultrarelativistic nucleus-nucleus collisions is to understand the properties of strongly interacting matter under extreme conditions of high temperature and density. The conventional methods to describe hadron production in heavy-ion collisions are by use of the hydrodynamical model for transverse momentum pT < 2 GeV/c [1,2,3,4] and by jet fragmentation for pT > 8 GeV/c [5,6,7]. In heavy-ion collisions above 2 TeV, the density of minijets produced by semihard scatterings of partons can be so high that the conventional treatment of such collisions may be inadequate. It is found that the minijets are abundantly produced at the CERN Large Hadron Collider (LHC) compared with RHIC [12] These previous studies [11,12] have revealed that the formation of hadrons at intermediate pT region is sensitive to the momentum degradation of the hard and semihard partons. Pb collisions at summarizes the results and gives the conclusion from the present study
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