Tetraquark interpretation of the BELLE data on the anomalous $Υ(1S) π^+π^-$ and $Υ(2S) π^+π^-$ production near the $Υ(5S)$ resonance

Details Tetraquark interpretation of the BELLE data on the anomalous $Υ(1S) π^+π^-$ and $Υ(2S) π^+π^-$ production near the $Υ(5S)$ resonance Tetraquark interpretation of the BELLE data on the anomalous $Υ(1S) π^+π^-$ and $Υ(2S) π^+π^-$ production near the $Υ(5S)$ resonance

2009-12-26

arxiv.org/abs/0912.5016v3

Phys.Rev.Lett.104:162001,2010; Erratum-ibid.107:049903,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures, 3 tables; Abstract and Figures 1 & 2 modified; small changes in the text; some references added; version c

Scientific paper

10.1103/PhysRevLett.104.162001 1

We analyze the Belle data [K. F. Chen {\it et al.} (Belle Collaboration), Phys.\ Rev.\ Lett.\ {\bf 100}, 112001 (2008); I. Adachi {\it et al.} (Belle Collaboration), arXiv:0808.2445] on the processes $e^+ e^- \to \Upsilon(1S)\; \pi^+\pi^-, \Upsilon(2S)\; \pi^+\pi^-$ near the peak of the $\Upsilon(5S)$ resonance, which are found to be anomalously large in rates compared to similar dipion transitions between the lower $\Upsilon$ resonances. Assuming these final states arise from the production and decays of the $J^{PC}=1^{--}$ state $Y_b(10890)$, which we interpret as a bound (diquark-antidiquark) tetraquark state $[bq][\bar{b}\bar{q}]$, a dynamical model for the decays $Y_b \to \Upsilon(1S)\; \pi^+\pi^-, \Upsilon(2S)\; \pi^+\pi^-$ is presented. Depending on the phase space, these decays receive significant contributions from the scalar $0^{++}$ states, $f_0(600)$ and $f_0(980)$, and from the $2^{++}$ $q\bar{q}$-meson $f_2(1270)$. Our model provides excellent fits for the decay distributions, supporting $Y_b$ as a tetraquark state.

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