Transverse momentum spectra of identified charged hadrons with the ALICE detector in Pb--Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV

TL;DR

This paper reports on the measurement of transverse momentum spectra of identified charged hadrons in Pb--Pb collisions at 2.76 TeV using the ALICE detector, providing insights into particle production and collision dynamics.

Contribution

It presents the first detailed spectra of identified charged hadrons at this energy, comparing results with models and previous RHIC data to enhance understanding of heavy-ion collision physics.

Findings

Particle spectra extend from low to moderate transverse momentum.

Particle ratios vary with collision centrality and momentum.

Results are consistent with hydrodynamic models and previous experiments.

Abstract

The measurement of identified charged-hadron production at mid-rapidity ($|y| < 0.5$) performed with the ALICE experiment is presented for Pb--Pb collisions at $\sqrt{s_{\rm NN}} = \rm .76 TeV$. The transverse momentum spectra of $\pi^{\pm}$, $K^{\pm}$, $p$ and $\bar{p}$ are measured from 100 MeV/c up to 3 GeV/c for pions, from 200 MeV/c up to 2 GeV/c for kaons and from 300 MeV/c up to 3 GeV/c for protons and antiprotons using the \emph{dE/dx} and the \emph{time-of-flight} particle-identification techniques. Preliminary results on charged hadron production yields and particle ratios are reported as a function of $p_{T}$ and collision centrality. Finally, the results are discussed in terms of hydrodynamics-inspired models and compared with published RHIC data in Au--Au collisions at $\sqrt{s_{\rm NN}} = \rm 200 GeV$ and predictions for the LHC.