Speaker
Description
The spectroscopy of exotic hadrons provides a unique opportunity to investigate the dynamics of Quantum Chromodynamics (QCD) in the non-perturbative regime. The large data samples collected by the CMS experiment during LHC Run 2 and Run 3 have enabled high-precision studies of multiquark candidates in several heavy-quark systems.
Recent CMS measurements have established the existence of multiple fully charmed tetraquark candidates in the (J/ψ,J/ψ) invariant-mass spectrum. The analysis reveals three resonant structures, (X(6600)), (X(6900)), and (X(7100)), with significances exceeding the observation threshold, and provides evidence for quantum interference effects among the resonances, offering new insight into the spectroscopy and internal structure of fully heavy multiquark states.
In addition, CMS has recently reported the observation of a resonant structure in the (Υ(1S)φ(1020)) final state, opening new investigations into study exotic states containing both beauty and strangeness. This measurement extends the experimental exploration of tetraquark spectroscopy into a previously unexplored sector and provides valuable input for theoretical descriptions of multiquark dynamics.
Together, these measurements demonstrate the outstanding potential of the CMS experiment for precision spectroscopy and establish a new benchmark for understanding the spectrum of exotic hadrons in high-energy proton--proton collisions.