CMS-PAS-HIN-21-001

CMS-PAS-HIN-21-001
Azimuthal anisotropy of $\Upsilon$ (1S) mesons in pPb collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} =$ 8.16 TeV
CMS Collaboration
April 2022

Abstract: The azimuthal anisotropy of $\Upsilon$ (1S) mesons in high-multiplicity proton-lead (pPb) collisions is studied using data collected by the CMS experiment at a center-of-mass energy per nucleon pair of ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} =$ 8.16 TeV. The $\Upsilon$ (1S) mesons are reconstructed from the dimuon decay channel. The anisotropy, characterized by the second Fourier harmonic $v_{2}$ coefficient, is determined using the two-particle correlation technique, where the $\Upsilon$ (1S) mesons are correlated with charged hadrons. A large pseudorapidity gap is used to suppress short-range correlations. The $v_{2}$ values are measured in four transverse momentum intervals in the range from 0 to 30 GeV/ $c$ . No azimuthal anisotropy is observed for the $\Upsilon$ (1S) mesons in high-multiplicity pPb collisions, which is consistent with previous lead-lead collision results.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here.

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