Centrality dependence of charged particle spectra and RCP in Pb+Pb collisions at \sqrt{s_{NN}}=2.76TeV with the ATLAS detector at the LHC

TL;DR

This paper reports on measurements of charged particle spectra and nuclear modification factors in Pb+Pb collisions at 2.76 TeV, revealing significant suppression of charged hadrons in central collisions across a broad p_T range.

Contribution

It provides detailed measurements of charged particle suppression and spectra dependence on collision centrality and pseudorapidity at LHC energies.

Findings

Strong suppression of charged hadrons at p_T ~7 GeV in central collisions

Suppression exceeds a factor of 2 at high p_T

No significant pseudorapidity dependence observed

Abstract

The ATLAS experiment at the LHC measures the charged particle spectra and the nuclear modification factor in Pb+Pb collisions at the \sqrt{s_{NN}}=2.76TeV in a transverse momentum range up to 30 GeV and a pseudorapidity range up to |\eta| < 2.5. The measurement reveals the strong suppression of charged hadron production in the most central collisions at a p_T of about 7 GeV. A suppression of more than a factor of 2 is also measured at the upper edge of the analyzed p_T range. The suppression does not show any strong \eta dependence.