Abstract
A measurement of the elliptic flow (v2) of prompt J/ψ mesons in high-multiplicity pPbcollisions is reported using data collected by the CMS experiment at a nucleon-nucleon center-of-mass energy sNN=8.16TeV. Prompt J/ψ mesons decaying into two muons are reconstructed in the rapidity region in the nucleon-nucleon center-of-mass frame (ycm), corresponding to either −2.86<ycm<−1.86 or 0.94<ycm<1.94. The average v2 result from the two rapidity ranges is reported over the transverse momentum (pT ) range from 0.2 to 10 GeV. Positive v2 values are observed for the prompt J/ψ meson, as extracted from long-range two-particle correlations with charged hadrons, for 2<pT<8 GeV. The prompt J/ψ results are compared with previous CMS measurements of elliptic flow for open charm mesons (D0) 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.
Highlights
Strong collective behavior is found in the azimuthal correlations of particles emitted in relativistic nucleus-nucleus (AA) collisions at the BNL RHIC [1,2,3,4] and at the CERN LHC [5,6,7,8,9,10]
The azimuthal anisotropy of J/ψ mesons is extracted from the long-range (| η| > 1) two-particle azimuthal correlations, following an identical procedure to that described in Refs. [21,27,43]
By assuming that Vn is the product of single-particle anisotropies of J/ψ mesons and reference charged particles [57], Vn (J/ψ, ref) = vn(J/ψ) × vn(ref), the vn anisotropy harmonics for J/ψ candidates can be e√xtracted as a function of invariant mass, vn(J/ψ) = Vn (J/ψ, ref)/ Vn
Summary
Strong collective behavior is found in the azimuthal correlations of particles emitted in relativistic nucleus-nucleus (AA) collisions at the BNL RHIC [1,2,3,4] and at the CERN LHC [5,6,7,8,9,10] These correlations, which are long-range in pseudorapidity (η), suggest the formation of a strongly interacting quark-gluon plasma (QGP) that exhibits nearly ideal hydrodynamic behavior [11,12,13]. The recent observation of a significant elliptic flow signal for prompt D0 mesons in pPb collisions has provided evidence for charm quark collectivity in a small system [43].
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