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Model for anomalous $Υ'' \to Υππ$ transition with account of chiral phase shift in hadron bag of quarkonium

V. V. Kiselev·A. K. Likhoded
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Abstract

We assume that a rather large bag of the $Υ''(3S b\bar b)$ heavy quarkonium is in the phase of spontaneously broken chiral symmetry, in contrast to the $Υ(1S b \bar b)$ hadron bag, having small size and being in the phase of exact chiral symmetry, so that the shift of the phases in the $Υ'' \to Υππ$ transition is the additional source for the $ππ$ pairs. This source causes an anomalous $ππ$ invariant mass distribution, which is experimentally observed.

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V. V. Kiselev, A. K. Likhoded. 1994-06-03. Model for anomalous $Υ'' \to Υππ$ transition with account of chiral phase shift in hadron bag of quarkonium. https://arxiv.org/abs/hep-ph/9406219

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