Measurement of the azimuthal anisotropy of ${\rm Y}$(1S) and ${\rm Y}$(2S) mesons in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV

Abstract

The second-order Fourier coefficients ($v_2$) characterizing the azimuthal distribution of ${\rm Y}$(1S) and ${\rm Y}$(2S) mesons arising from PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV are studied. The ${\rm Y}$ mesons are reconstructed in their dimuon decay channel, as measured by the CMS detector. The data set corresponds to an integrated luminosity of 1.7 nb${}^{-1}$. The scalar product method is used to extract the $v_2$ coefficients of the azimuthal distribution. Results are reported for the rapidity range $|y|$ $<$ 2.4, with the transverse momentum 0 $<$ $p_{\mathrm{T}}$ $<$ 50 GeV/$c$, and in three centrality ranges of 10-30%, 30-50% and 50-90%. In contrast to the J/$\psi$ mesons, the measured $v_2$ values for the ${\rm Y}$ mesons are found to be consistent with zero.

arXiv commentReplaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-19-002 (CMS Public Pages)

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