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

TL;DR

This paper proposes that the anomalously large rates of certain bottomonium transitions near the $$ resonance can be explained by interpreting the $Y_b(10890)$ as a tetraquark state, supported by a dynamical decay model fitting experimental data.

Contribution

The paper introduces a tetraquark model for the $Y_b(10890)$ state and demonstrates its consistency with experimental decay distributions from Belle data.

Findings

The model fits the decay distributions well.

Supports the tetraquark interpretation of $Y_b(10890)$.

Highlights significant contributions from scalar and tensor mesons.

Abstract

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.