Four-Charm-Quark Matter from the CMS Collaboration as a Witness of the Development of High-Precision Hadron Spectroscopy

TL;DR

This paper discusses recent CMS experimental discoveries of new structures in the di-$J/mbda$ invariant mass spectrum, providing evidence for four-charm-quark matter and highlighting advances in high-precision hadron spectroscopy.

Contribution

It reports new experimental observations of exotic four-charm-quark states, demonstrating progress in high-precision hadron spectroscopy and exotic matter research.

Findings

Discovery of new structures at 6638 MeV and 7134 MeV

Confirmation of the $X(6900)$ at 6847 MeV

Evidence supporting the existence of four-charm-quark matter

Abstract

Recent CMS observations in the di-$J/\psi$ invariant mass spectrum reveal new structures at 6638 MeV ($X(6600)$)) and 7134 MeV, and confirm the $X(6900)$ at 6847 MeV. These findings provide crucial insights into four-charm-quark matter. The CMS Collaboration's result serves as a testament to the progress in exploring exotic hadronic matter.