Study of Υ(10753) decays to π+πΥ(nS) final states at Belle II

The Belle II collaboration

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Abstract

We present an analysis of the process e+e → π+πΥ(nS) (where n = 1, 2, or 3) reconstructed in 19.6 fb−1 of Belle II data during a special run of the SuperKEKB collider at four energy points near the peak of the Υ(10753) resonance. By analyzing the mass distribution of the π+πΥ(nS) system and the Born cross sections of the e+e → π+πΥ(nS) process, we report the first observation of Υ(10753) decays to the π+πΥ(1S) and π+πΥ(2S) final states, and find no evidence for decays to π+πΥ(3S). Possible intermediate states in the π+πΥ(1S, 2S) transitions are also investigated, and no evidence for decays proceeding via the πZb± or f0(980)Υ(nS) intermediate states is found. We measure Born cross sections for the e+e → π+πΥ(nS) process that, combined with results from Belle, obtain the mass and width of Υ(10753) to be (10756.6 ± 2.7 ± 0.9) MeV/c2 and (29.0 ± 8.8 ± 1.2) MeV, respectively. The relative ratios of the Born cross sections at the Υ(10753) resonance peak are also reported for the first time.

Original languageEnglish
Article number116
JournalJournal of High Energy Physics
Volume2024
Issue number7
DOIs
StatePublished - Jul 2024

Keywords

  • e-e Experiments
  • Exotics
  • Quarkonium
  • Spectroscopy

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