Spectra of Identified Hadrons in Pb-Pb Collisions at LHC

Abstract

The transverse momentum distributions of identified hadrons produced in Pb-Pb collisions at the Large Hadron Collider (LHC) are studied in the low and intermediate range for $p_T<5$ GeV/c. All four spectra ($\pi ,K,p,\Lambda$) can be well reproduced in the recombination model based on a common thermal parton distribution of light and strange quarks and on shower partons emitted in hard and semihard jets. Two essential parameters are adjusted to fit the data, one being the inverse slope of the thermal distribution and the other revealing the degree of momentum degradation in the medium. Various combinations of thermal and shower parton components are calculated, showing the dominance of minijets. The effect of minijets is to produce harder baryons than mesons resulting in their ratio to peak at around $p_T\sim 3$ GeV/c. Substantial portion of the jet energy is found to be lost to the dense medium before the partons emerge at the surface to undergo hadronization by recombination.

In this revised version 2 figures are added to amplify the discussion on the differences between RHIC and LHC. To be published in Phys. Rev. C

References in corpus (3)

• Identified particles in pp and Pb-Pb collisions at LHC energies with the ALICE detector
• K0s and Λ production in Pb--Pb collisions with the ALICE experiment
• Scaling Behavior of the Azimuthal and Centrality Dependencies of Jet Production in Heavy-ion Collisions

Cited by in corpus (10)

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• Measurement of the azimuthal anisotropy of neutral pions in PbPb collisions at sqrt(s(NN)) = 2.76 TeV
• Local Multiplicity Fluctuations as a Signature of Critical Hadronization at LHC
• Universal Formula for Baryon Spectra in Heavy-ion Collisions and its Implications
• Centrality and transverse momentum dependence of hadrons in Pb+Pb collisions at LHC
• Effects of Minijets on Hadronic Spectra and Azimuthal Harmonics in Au-Au Collisions at 200 GeV
• Centrality and Transverse Momentum Dependencies of Minijets and Hadrons in Au-Au Collisions
• Production of strange particles in charged jets in Pb--Pb and p--Pb collisions measured with ALICE
• Strange Baryon to Meson Ratio
• Universal Energy Dependence of Measured Temperatures for Baryons Produced in Heavy-ion Collisions