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

CMS Collaboration

The cross sections for ${\rm Y}$(1S), ${\rm Y}$(2S), and ${\rm Y}$(3S) production in lead-lead (PbPb) and proton-proton (pp) collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 5.02 TeV have been measured usi…