Heavy flavor spectroscopy studies at CMS

TL;DR

This paper reports on recent CMS studies of heavy flavor spectroscopy, including evidence for exotic hadrons, new decay channels in beauty hadrons, and observations in proton-proton and heavy-ion collisions at 13 TeV.

Contribution

It presents new experimental evidence for exotic resonances and decay channels in heavy flavor spectroscopy at CMS, expanding the understanding of heavy hadron states.

Findings

First evidence for X(3872) in heavy-ion collisions

Discovery of three new structures in J/ψ J/ψ mass spectrum

Identification of new decay channels in beauty hadrons

Abstract

The CMS Collaboration has performed many studies in the field of heavy flavor spectroscopy. In this report, recent studies on exotic resonances in proton-proton collisions at $\sqrt{s} = 13$ TeV at CMS are presented. For the exotic hadrons, these results include the first evidence for X(3872) in heavy-ion collisions and three new structures in $J/\psi J/\psi$ mass spectrum. Beside the exotic hadrons, we also found new decay channels in conventional beauty hadrons, including $B^{0}_{s}\rightarrow\psi(2S)K^{0}_{S}$, $\Lambda_{b}^{0}\rightarrow J/\psi\Xi^{-}K^{+} $, $B^{0} \rightarrow \psi(2S)K^{0}_{S}\pi^{+} \pi^{-}$, and $\Xi_{b}^{-} \rightarrow \psi(2S)\Xi^{-}$.