Exotic Charmonium and Bottomonium-like Resonances

Abstract

Many new states in the charmonium and bottomonium mass region were recently discovered by the BaBar, Belle and CDF Collaborations. We use the QCD Sum Rule approach to study the possible structure of some of these states. In particular we identify the recently observed bottomonium-like resonance $Z_b^{+}(10610)$ with the first excitation of the tetraquark $X_b(1^{++})$, the analogue of the X(3872) state in the charm sector.

5 pages, 1 figure

References in corpus (11)

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• Four-quark stability
• The possible candidates of tetraquark : $Z_b(10610)$ and $Z_b(10650)$

Cited by in corpus (10)

• $Z_c^{+}(3900)$ decay width in QCD sum rules
• Charged Exotic Charmonium States
• Exotic mesons with hidden bottom near thresholds
• General considerations on the nature of $Z_b(10610)$ and $Z_b(10650)$ from their pole positions
• Is $Z_b(10610)$ a Molecular State?
• $Z_b(10610)$ and $Z_b^{\prime }(10650)$ decays in a covariant quark model
• The $\rho (1S,2S)$, $\psi (1S,2S)$, ${\rm Y}(1S,2S)$ and ${\psi }_t(1S,2S)$ mesons in a double pole QCD Sum Rule
• Tetraquark states in the bottom sector and the status of the $Y_b$(10890) state
• Charged-to-neutral heavy meson yield ratio at the Z_b^0 resonances as a probe of the I^G(J^P)=0^-(1^+) channel
• Charged bottomonium-like structures $Z_b(10610)$ and $Z_b(10650)$