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arXiv · 0810.3546

Observation of candidate exotic mesons containing heavy quarks with Belle

S. -K. Choi
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Abstract

We report the observation of two resonance-like structures in the $π^+ χ_{c1}$ invariant mass distribution near 4.1 GeV in exclusive $B\to Kπ^+χ_{c1}$ decays. A detailed Dalitz-plot analysis demonstrates that these structures cannot be produced by reflections from any known and possibly unknown resonances in the $Kπ$ channel. If these two peaks are produced by resonances in the $π^+χ_{c1}$ channel, their minimal quark structure would have to be a $c\bar{c}u\bar{d}$ tetraquark arrangement, similar to that proposed for the $Z^+(4430)$ structure reported by Belle last year in the $π^+ψ^{'}$ mass distribution produced in $B\to Kπ^+ψ^{'}$ decays. In addition, we report some new measurements on the properties of the X(3872) meson and the $1^{--}$ $Y$ states that are produced with initial state radiation. %and also other latest XYZ results. The analyses are based on a large data sample recorded at the $Υ(4S)$ resonances and nearby continuum with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider.

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S. -K. Choi. 2008-10-20. Observation of candidate exotic mesons containing heavy quarks with Belle. https://arxiv.org/abs/0810.3546

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