$Z_c(4100)$ and $Z_c(4200)$ as hadrocharmonium

Abstract

It is suggested that the recently reported charged charmoniumlike resonance $Z_c(4100)$ and the previously observed $Z_c(4200)$ are two states of hadrocharmonium, related by the charm quark spin symmetry in the same way as the lowest charmonium states ${\eta }_c$ and $J/\psi$. Namely, the $Z_c(4100)$ is (dominantly) the ${\eta }_c$ embedded in an light-quark excitation with quantum numbers of a pion, while the $Z_c(4200)$ is a similar four quark state containing $J/\psi$ instead of ${\eta }_c$. It is argued that this picture suggests certain relations between the properties of the two exotic resonances and a distinctive pattern of their decays that can be tested experimentally. It is also pointed out that due to the presence of a spatially compact $c\bar{c}$ charmonium the discussed exotic $Z_c$ states may be produced as resonances in the $s$ channel in $\bar{p}p$ annihilation.

6 pages

References in corpus (5)

• Exotics: Heavy Pentaquarks and Tetraquarks
• Charmonium
• Observation of a new charged charmoniumlike state in B -> J/psi K pi decays
• Pionic transitions from X(3872) to chi_{cJ}
• Holographic Hadro-Quarkonium

Cited by in corpus (13)

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• QCD Sum Rules Approach to the $X,Y$ and $Z$ States
• Heavy hadronic molecules with pion exchange and quark core couplings: a guide for practitioners
• New charged resonance $Z_c^{-}(4100)$: the spectroscopic parameters and width
• Tetraquarks in large-$N_c$ QCD
• Strange hadrocharmonium
• The spin parity of $Z_c^{-}$(4100), $Z_1^{+}$(4050) and $Z_2^{+}$(4250)
• Heavy-light hybrid mesons with different spin-parities
• Masses of tetraquark states in the hidden charm sector above $D-D^{\ast }$ threshold
• Strong decays of the isovector-scalar $D^{\ast }{\bar{D}}^{\ast }$ hadronic molecule
• Hadronic molecules and multiquark states