Suppression of the high $p_T$ charged hadron $R_{AA}$ at the LHC

Details Suppression of the high $p_T$ charged hadron $R_{AA}$ at the LHC Suppression of the high $p_T$ charged hadron $R_{AA}$ at the LHC

2011-03-04

arxiv.org/abs/1103.0809v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, revtex4

Scientific paper

We present a parameter free postdiction of the high-$p_T$ charged-hadron nuclear modification factor ($R_{AA}$) measured by the ALICE collaboration in $Pb$-$Pb$ collisions at the Large Hadron Collider (LHC). The evolution of the collision fireball is modeled using viscous fluid dynamics, with parameters adjusted to describe the soft hadron yields and elliptic flow. Assuming the dominance of radiative energy loss, we compute the medium modification of the $R_{AA}$ within perturbative QCD, using the higher twist scheme. The transverse momentum diffusion coefficient $\hat{q}$ is assumed to scale with the entropy density and normalized by fitting the $R_{AA}$ in the most central $Au$-$Au$ collisions at the Relativistic Heavy-Ion Collider (RHIC). This set up is validated in non-central $Au$-$Au$ collisions at RHIC and then extrapolated to $Pb$-$Pb$ collisions at the LHC, keeping the relation between $\hat{q}$ and entropy density unchanged. We obtain a satisfactory description of the ALICE $R_{AA}$ for $p_T \geq 9$ GeV but underpredict the data at lower $p_T$.

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