CMS-PAS-HIN-21-008

CMS-PAS-HIN-21-008
Measurements of the azimuthal anisotropy of charmonia in PbPb collisions at $\sqrt{\smash[b]{s_{_{\mathrm{NN}}}}}=$ 5.02 TeV
CMS Collaboration
April 2022

Abstract: The second-order ( $v_{2}$ ) and third-order ( $v_{3}$ ) Fourier coefficients describing the azimuthal anisotropy of prompt and nonprompt J/ $\psi$ and prompt $\psi$ (2S) mesons are measured in PbPb collisions at $\sqrt{\smash[b]{s_{_{\mathrm{NN}}}}}=$ 5.02 TeV. The analysis uses a dataset corresponding to an integrated luminosity of 1.6 nb $^{-1}$ recorded with the CMS detector in 2018. J/ $\psi$ and $\psi$ (2S) mesons are reconstructed using their dimuon decay channel. The $v_{2}$ and $v_{3}$ values are extracted using the scalar product method and studied as functions of meson transverse momentum and PbPb collision centrality. The measured $v_{2}$ values for the prompt J/ $\psi$ mesons are larger than of those of nonprompt J/ $\psi$ mesons. The study of azimuthal anisotropy for prompt $\psi$ (2S) mesons is reported for the first time, showing $v_{2}$ larger than that of J/ $\psi$ mesons.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here.

CMS Publications