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

The CMS collaboration
Phys. Lett. B and tables can be found at (CMS Public Pages), 2020.

Abstract (data abstract)
CERN-LHC. The second-order Fourier coefficients ($v_{2}$) characterizing the azimuthal distribution of $\Upsilon(\mathrm{1S})$ and $\Upsilon(\mathrm{2S})$ mesons arising from PbPb collisions at $ {\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $ 5.02 TeV are studied. The $\Upsilon$ mesons are reconstructed in their $\mathrm{dimuon}$ decay channel, as measured by the CMS detector. The data set was collected in 2018 and corresponds to an integrated luminosity of 1.7$\smash{\,\text{nb}^{-1}}$. 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\smash{\,\text{GeV/c}}$, and in three centrality ranges of 10-30, 30-50 and 50-90%. In contrast to the J/$\psi$ mesons, no azimuthal anisotropy is observed for the $\Upsilon$ mesons.

  • Table 1

    Data from Figure 2a


    $v_{2}$ of $\Upsilon(\mathrm{1S})$ mesons as a function of collision centrality.

  • Table 2

    Data from Figure 2a


    $v_{2}$ of $\Upsilon(\mathrm{1S})$ and $\Upsilon(\mathrm{2S})$ mesons integrated for 10-90% centrality range.

  • Table 3

    Data from Figure 2b


    $v_{2}$ of $\Upsilon(\mathrm{1S})$ as a function of $p_{\mathrm{T}}$ in 10-90% centrality range.

  • Table 4

    Data from Figure 3


    $v_{2}$ of $\Upsilon(\mathrm{1S})$ as a function of $p_{\mathrm{T}}$ in three centrality ranges, 10-30%, 30-50% and 50-90%.

  • Table 5

    Data from Figure 4


    $v_{2}$ of $\Upsilon(\mathrm{1S})$ as a function of $p_{\mathrm{T}}$ in 5-60% centrality range.

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