CMS-PAS-HIN-12-001

CMS-PAS-HIN-12-001
Measurement of the azimuthal anisotropy of prompt and non-prompt J/psi in PbPb collisions at sqrt(sNN) = 2.76 TeV
CMS Collaboration
2013

Abstract: This document presents the azimuthal anisotropy analysis of prompt $J/\psi \rightarrow \mu^{+}\mu^{-}$ measured in collisions at $\sqrt{s_{_{NN}}} = 2.76$ TeV, based on a data sample collected during the 2011 PbPb run with the CMS experiment at the LHC, which corresponds to an integrated luminosity of 150 $\mu \text{b}^{-1}$ . The analysis is performed using the event-plane method. Amplitudes of the second Fourier component ( $v_2$ ) of the angular distributions are presented as a function of the prompt $J/\psi$ transverse momentum, p $_\text{T}$ , for different collision centrality classes, in a broad kinematic range, < \text{p}_\text{T} < 30 $\,GeV/$ c $and$ \|\text{y}\| < 2.4 $. The measured$ v_{2} $, averaged in the centrality 10--60\% for prompt$ J/\psi $with .5<\text{p}_\text{T}<30$ \,GeV/ $c$ measured in $\|\text{y}\|<2.4$ is .054 \pm 0.013 (\text{stat}) \pm 0.006 (\text{syst}) $. A non-zero$ v_2 $is measured in all the kinematic bins studied. The observed anisotropy shows no significant centrality or rapidity dependence when integrated over rapidity and centrality, respectively. The$ v_2 $of prompt$ J/\psi $, measured in the 10--60\% centrality events is compatible with a p$ _\text{T}$-independent anisotropy.
Links: CDS record (PDF) ; inSPIRE record ; Public twiki page ; CADI line (restricted) ;

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