Observation of prompt J/psi meson elliptic flow in high-multiplicity pPb collisions at root s(NN)=8.16 TeV

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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.

CMS, Heavy-ion physics, Correlation, Flow, pPb, Heavy flavor, P-PB COLLISIONS, RELATIVISTIC NUCLEAR COLLISIONS, RANGE ANGULAR-CORRELATIONS, LONG-RANGE, 2-PARTICLE CORRELATIONS, SIDE, Astronomy & Astrophysics, Physics, Nuclear, Physics, Particles & Fields, Physics
Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., Brandstetter, J., Dragicevic, M., Erö, J., Escalante Del Valle, A., Flechl, M., Frühwirth, R., Ghete, V. M., Hrubec, J., Jeitler, M., Krammer, N., Krätschmer, I., Liko, D., Madlener, T., … Woods, N. (2019). Observation of prompt J/ψ meson elliptic flow in high-multiplicity pPb collisions at sNN=8.16 TeV. In Physics Letters B (Vol. 791, pp. 172–194). Elsevier BV. https://doi.org/10.1016/j.physletb.2019.02.018