ICHEP 2022

First measurement of Y(3S) meson in PbPb collision.

9 Jul 2022, 11:30

15m

Room 5 (Avorio)

Parallel Talk Heavy Ions Heavy Ions

Speaker

Soohwan Lee (Korea University)

Description

The suppression of bottomonium states is closely related to the interaction with the QGP, supposedly created in heavy ion (AA) collisions. The different binding energies of bottomonium states provide a unique pattern of yield modification which is useful to study thermal properties of the QGP. Previous results from CMS have shown the evidence of sequential suppression for $\mathrm{{\rm Y}}$(1S), $\mathrm{{\rm Y}}$(2S), and $\mathrm{{\rm Y}}$(3S). However, the given statistics were limited to clearly identify the $\mathrm{{\rm Y}}$(3S) meson. In this talk, we present the new measurements of excited bottomonium states with improved analysis technique and high-statistics data, which enables us to observe the $\mathrm{{\rm Y}}$(3S) meson in AA collisions for the first time. The results are compared with various theoretical calculations and provide strong constraints to the dynamical models.

Presentation materials

ICHEP2022_Upsilon_soohwanlee_v2.pdf