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The cross sections for $\Upsilon$(1S), $\Upsilon$(2S), and $\Upsilon$(3S)production in lead-lead (PbPb) and proton-proton (pp) collisions at$\sqrt{s_{_\mathrm{NN}}} =$ 5.02 TeV have been measured using the CMS detectorat the LHC. The nuclear modification factors, R$_\mathrm{AA}$, derived from thePbPb-to-pp ratio of yields for each state, are studied as functions of mesonrapidity and transverse momentum, as well as PbPb collision centrality. Theyields of all three states are found to be significantly suppressed, andcompatible with a sequential ordering of the suppression,R$_\mathrm{AA}$($\Upsilon$(1S)) $>$ R$_\mathrm{AA}$($\Upsilon$(2S)) $>$R$_\mathrm{AA}$($\Upsilon$(3S)) . The suppression of $\Upsilon$(1S) is largerthan that seen at $\sqrt{s_{_\mathrm{NN}}} =$ 2.76 TeV, although the two arecompatible within uncertainties. The upper limit on the R$_\mathrm{AA}$ of$\Upsilon$(3S) integrated over $p_\mathrm{T}$ and rapidity is 0.094 at 95%confidence level, which is the strongest suppression observed for any hadronspecies in heavy ion collisions to date.

physics letters b

Measurement of nuclear modification factors of $\Upsilon$(1S),  $\Upsilon$(2S), and $\Upsilon$(3S) mesons in PbPb collisions at  $\sqrt{s_{_\mathrm{NN}}} =$ 5.02 TeV