Hadro-Charmonium

TL;DR

The paper proposes that compact charmonium states can be bound inside light hadronic matter, forming hadro-charmonium, which may explain certain observed resonant peaks in particle physics.

Contribution

It introduces the concept of hadro-charmonium as a new bound state model, explaining recent experimental resonances involving charmonium and light hadrons.

Findings

Hadro-charmonium states can account for specific observed resonances.

Bound states retain charmonium properties and decay into light mesons.

The model suggests possible existence of hadro-bottomonium states.

Abstract

We argue that relatively compact charmonium states, $J/\psi$, $\psi(2S)$, $\chi_c$, can very likely be bound inside light hadronic matter, in particular inside higher resonances made from light quarks and/or gluons. The charmonium state in such binding essentially retains its properties, so that the bound system decays into light mesons and the particular charmonium resonance. Thus such bound states of a new type, which we call hadro-charmonium, may explain the properties of some of the recently observed resonant peaks, in particular of Y(4.26), Y(4.32-4.36), Y(4.66), and Z(4.43). We discuss further possible implications of the suggested picture for the observed states and existence of other states of hadro-charmonium and hadro-bottomonium.