Centrality Dependence of Charged Particle Production at Large Transverse Momentum in Pb--Pb Collisions at $\sqrt{s_{\rm{NN}}} = 2.76$ TeV
- Abelev, Betty et al
- arXiv:1208.2711CERN-PH-EP-2012-233
 | Charged particle $p_{\rm T}$ distribution measured in \mbox{Pb--Pb} collisions in different centrality intervals. The spectra are scaled for better visibility. The dashed lines show the pp reference \cite{PPREFERENCE} spectra scaled by the nuclear overlap function determined for each centrality interval (Table~\ref{CENTR}) and by the Pb-Pb spectra scaling factors. The systematic and statistical uncertainties for \mbox{Pb--Pb} are added quadratically. The uncertainties on the pp reference are not shown. |
 | noimg: Average values of the number of participating nucleons $\langle N_{{\rm{part}}} \rangle$ and the nuclear overlap function $\langle T_{\rm{AA}} \rangle$ \cite{MILLER_TAA} for the centrality intervals used in the analysis.: Contribution to the systematic uncertainties on the $p_{\rm T}$ spectra (0.15--50 GeV/$c$) for the most central and peripheral Pb--Pb collisions. Also listed are the systematic uncertainties on the pp reference (0.15--50 GeV/$c$) \cite{PPREFERENCE}. |
 | Nuclear modification factor $R_{\rm{AA}} $ of charged particles measured in \mbox{Pb--Pb} collisions in nine centrality intervals. The boxes around data points denote $p_{{\rm T}}$-dependent systematic uncertainties. The systematic uncertainties on the normalization which are related to $\langle T_{\rm{AA}} \rangle$ and the normalization of the pp data are added in quadrature and shown as boxes at $R_{\rm{AA}} =1$. |
 | Nuclear modification factor $R_{\rm{AA}} $ of charged particles as a function of $\langle N_{{\rm{part}}} \rangle$ (top panel) and ${\rm{d}}{N_{\rm{ch}}}/\rm{d}\eta$ (bottom panel) measured by ALICE in \mbox{Pb--Pb} collisions in different $\pt$-intervals, compared to PHENIX results in $5<\pt<7$ GeV/$c$ \cite{PHENIXRAA}. The boxes around the data represent the $p_{\rm T}$-dependent uncertainties on the \mbox{Pb--Pb} $p_{\rm T}$ spectra. The boxes at $R_{\rm{AA}} =1$ represent the systematic uncertainties on the pp reference in different $\pt$-intervals ($p_{\rm{T}}$-interval increases from left to right, the left-most is for PHENIX). The systematic uncertainties on the overall normalization for ALICE and PHENIX are not shown. |
 | Nuclear modification factor $R_{\rm{AA}} $ of charged particles measured by ALICE in the most central \mbox{Pb--Pb} collisions (0--5\%) in comparison to results from CMS \cite{CMSRAA} and model calculations \cite{HOROWITZ2011, ASW, CHEN2011, MAJUMDER2011, RENK2011, RENK2011YAJEM}. The boxes around the data denote $p_{{\rm T}}$-dependent systematic uncertainties. For CMS statistical and systematic uncertainties on $R_{\rm {AA}}$ are added in quadrature. The systematic uncertainties on the normalization which are related to $\langle T_{\rm {AA}} \rangle$ and the normalization of the pp data are added in quadrature and shown as boxes at $R_{\rm{AA}} =1$ (the right-most is for CMS). |