Abstract:
A measurement of the elliptic flow (\({v}_{2}\)) of prompt \(J/\psi \) mesons in high-multiplicity \(p\text{Pb}\)collisions is reported using data collected by the CMS experiment at a nucleon-nucleon center-of-mass energy \(\sqrt{{s}_{\text{NN}}}=8.16\phantom{\rule{0.2em}{0ex}}\text{TeV}\). Prompt \(J/\psi \) mesons decaying into two muons are reconstructed in the rapidity region in the nucleon-nucleon center-of-mass frame (\({y}_{\text{cm}}\)), corresponding to either \(-2.86<{y}_{\text{cm}}<-1.86\) or \(0.94<{y}_{\text{cm}}<1.94\). The average \({v}_{2}\) result from the two rapidity ranges is reported over the transverse momentum (\({p}_{T}\) ) range from 0.2 to 10 GeV. Positive \({v}_{2}\) values are observed for the prompt \(J/\psi \) meson, as extracted from long-range two-particle correlations with charged hadrons, for \(2<{p}_{T}<8\) GeV. The prompt \(J/\psi \) 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 dynamics of charm quarks produced in high-multiplicity events arising from small systems.
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