Detailed study of Upsilon suppression with the measurement of the $\Upsilon$(3S) meson in PbPb collisions at 5.02 TeV in CMS

Owing to their different binding energs, bottomonia are particularly useful probes to understand the thermal properties of the quark-gluon plasma (QGP) created in relativistic heavy ion collisions. Previously, the CMS collaboration measured the sequential suppression of the $\Upsilon$(1S), $\Upsilon$(2S), and $\Upsilon$(3S) states in PbPb collisions. However, the $\Upsilon$(3S) yield was excessively low, thus allowing us to report only statistical upper limits. In this contribution, we report a detailed study of the measurement of excited bottomonium states with improved analysis technique and high-statistics data that enables us to observe the $\Upsilon$(3S) meson in AA collisions for the first time. The result provides a comprehensive picture of the three $\Upsilon$ states in PbPb collisions.