Observation of prompt J/$\psi$ meson elliptic flow in high-multiplicity pPb collisions at $\sqrt{s_\mathrm{NN}} =$ 8.16 TeV

The CMS collaboration
Phys.Lett.B 791 (2019) 172-194, 2019.

Abstract (data abstract)
A measurement of the elliptic flow ($v_2$) of prompt $\mathrm{J}/\psi$ mesons in high-multiplicitypPb collisions is reported using data collected by the CMS experiment at a nucleon-nucleoncenter-of-mass energy $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV. Prompt $\mathrm{J}/\psi$ mesons decaying intotwo muons are reconstructed in the rapidity region in the nucleon-nucleon center-of-massframe ($y_{\mathrm{cm}}$), corresponding to either $-2.86<y_{\mathrm{cm}}<-1.86$ or$0.94<y_{\mathrm{cm}}<1.94$. The average $v_2$ result from the two rapidity ranges is reported over the transverse momentum($p_{\mathrm{T}}$) range from 0.2 to 10 GeV. Positive $v_2$ values are observed for the prompt $\mathrm{J}/\psi$ meson,as extracted from long-range two-particle correlations with charged hadrons, for $2 <p_{\mathrm{T}}< 8$ GeV.The prompt $\mathrm{J}/\psi$ results are compared with previous CMS measurements of elliptic flow for open charm mesons(D$^0$) and strange hadrons. From these measurements, constraints can be obtained on the collective dynamicsof charm quarks produced in high-multiplicity events arising from small systems.

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