Universal scaling dependence of QCD energy loss from data driven studies

Abstract

In this paper we study the energy loss of jets in the QGP via the nuclear modification factor $R_{\text{AA}}$ for unidentified particles at high $p_{\text{T}}$ ($\gtrsim 10\text{GeV}/c$) in and out of the reaction plane of the collision. We argue that at such a high $p_{\text{T}}$ there are no genuine flow effects and, assuming that the energy loss is only sensitive to initial characteristics such as the density and geometry, find that $R_{\text{AA}}$ depends linearly on the (RMS) length extracted from Glauber simulations. Furthermore we observe that for different centrality classes the density dependence of the energy loss enters as the square root of the charged particle multiplicity normalized to the initial overlap area. The energy loss extracted for RHIC and LHC data from the $R_{\text{AA}}$ is found to exhibit a universal behavior.

15 pages, 5 figures, version to be published in Phys. Rev. C

References in corpus (10)

• Glauber Modeling in High Energy Nuclear Collisions
• The theory and phenomenology of perturbative QCD based jet quenching
• K${}_{\mathrm{S}}^0$ and $\mathrm{\Lambda }$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Jet physics in heavy-ion collisions
• Azimuthal anisotropy of charged particles at high transverse momenta in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Measurement of jet fragmentation into charged particles in pp and PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• A Detailed Study of High-pT Neutral Pion Suppression and Azimuthal Anisotropy in Au+Au Collisions at \sqrt{s_{NN}} = 200 GeV
• Measurement of the pseudorapidity and centrality dependence of the transverse energy density in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• A systematic comparison of jet quenching in different fluid-dynamical models
• Scaling patterns of the suppression of ${\pi }^0$ yields in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV: links to the transport properties of the QGP

Cited by in corpus (10)

• Production of charged pions, kaons and (anti-)protons in Pb-Pb and inelastic pp collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Centrality dependence of the nuclear modification factor of charged pions, kaons, and protons in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Production of K${}^{\ast }(892{)}^0$ and $\varphi (1020)$ in pp and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Exploring the initial stages in heavy-ion collisions with high-pT RAA and v2 theory and data
• Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{{}_{NN}}}$ from 62.4 GeV to 2.76 TeV
• Energy density and path-length dependence of the fractional momentum loss in heavy-ion collisions at $\sqrt{s_{\mathrm{NN}}}$ from 62.4 to 5020 GeV
• Event-Shape Engineering and Jet Quenching
• Shape of the quark gluon plasma droplet reflected in the high-p_T data
• Utilizing high-$p_{\perp }$ theory and data to constrain the initial stages of quark-gluon plasma
• High $p_{\mathrm{T}}$ spectra and anisotropy of light and heavy hadrons