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# ICHEP2012

4-11 July 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

## Tetraquark interpretation of the charged Bottomonium-like states $Z_b^\pm(10610)$ and $Z_b^\pm(10650)$ and implications

5 Jul 2012, 11:00
15m
Room 220 (Melbourne Convention and Exhibition Centre)

### Room 220

#### Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy

### Speaker

Dr Wei Wang (DESY (DE))

### Description

We present a tetraquark interpretation of the charged bottomonium-like states $Z^\pm_b(10610)$ and $Z^\pm_b(10650)$, observed by the Belle collaboration in the $\pi^\pm \Upsilon(nS)$ $(n=1,2,3)$ and $\pi^\pm h_b(mP)$ $(m=1,2)$ invariant mass spectra from the data taken near the peak of the $\Upsilon(5S)$. In this framework, the underlying processes involve the production and decays of a vector tetraquark $Y_b(10890)$, $e^+e^- \to Y_b(10890) \to [Z_b^\pm (10610)\pi^\mp, Z_b^\pm (10650)\pi^\mp]$ followed by the decays $[Z_b^\pm (10610), Z_b^\pm (10650)] \to \pi^\pm \Upsilon(nS), \pi^\pm h_b(mP)$. Combining the contributions from the meson loops and an effective Hamiltonian, we are able to reproduce the observed masses of the $Z_b^\pm (10610)$ and $Z_b^\pm (10650)$. The analysis presented here is in agreement with the Belle data and provides crucial tests of the tetraquark hypothesis. We also calculate the corresponding meson loop effects in the charm sector and find them dynamically suppressed.The charged charmonium-like states $Z_c^\pm(3752)$ and $Z_c^\pm(3882)$ can be searched for in the decays of the $J^{PC}=1^{--}$ tetraquark state $Y(4260)$ via $Y(4260) \to Z_c^\pm(3752)\pi^\mp$ and $Y(4260) \to Z_c^\pm(3882)\pi^\mp$, with the subsequent decays $(Z_c^\pm(3752),Z_c^\pm(3882)) \to (J/\psi, h_c)\pi^\pm$.

### Primary author

Dr Wei Wang (DESY (DE))

### Co-authors

Prof. Ahmed Ali (DESY) Dr Christian Hambrock (Univ. Dortmund, Germany)

 Slides