Centrality and transverse momentum dependence of hadrons in Pb+Pb collisions at LHC

TL;DR

This paper applies the recombination model to analyze the transverse momentum spectra of various identified hadrons in Pb+Pb collisions at LHC energies, achieving good agreement with experimental data across different centralities and high transverse momenta.

Contribution

It extends the recombination model to non-central collisions and high transverse momenta, providing a unified explanation for hadron production in heavy-ion collisions at LHC.

Findings

Good agreement with experimental data for all hadrons and centralities.

Successful description of hadron spectra up to 14 GeV/c transverse momentum.

Supports the recombination model as a comprehensive framework for hadronization.

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.