Charmonia and exotics from BESIII
Mihajlo Kornicer (for the BESIII collaboration)

TL;DR
This paper reviews recent BESIII findings of new charmonium-like states, including the $Z_c(3900)$ and $Z_c(4020)$, which suggest the existence of exotic four-quark matter beyond traditional meson models.
Contribution
It provides a comprehensive overview of recent experimental discoveries of exotic states that challenge conventional quark-model classifications.
Findings
Identification of $Z_c(3900)$ and $Z_c(4020)$ states
Evidence for states coupling to light mesons and heavy charmonium
Implication of four-quark matter existence
Abstract
Several states that couple to one light-meson and a heavy-charmonium are recently reported, including the and . These states cannot be interpreted within the constituent quark-model of mesons, and are good candidates for a new form of quark matter, four-quark matter. A review of recent results on new charmonium-like states studied at BESIII is presented.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research
