Observation of a new structure near 10.75 GeV in the energy dependence of the e + e → ϒ (nS)π + π (n = 1, 2, 3) cross sections

The BELLE collaboration

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Abstract

We report a new measurement of the e+e→ ϒ(nS)π+π (n = 1, 2, 3) cross sections at energies from 10.52 to 11.02 GeV using data collected with the Belle detector at the KEKB asymmetric-energy e+e collider. We observe a new structure in the energy dependence of the cross sections; if described by a Breit-Wigner function its mass and width are found to be M=(10752.7±5.9−1.1+0.7)MeV/c2 and Γ=(35.5−11.3−3.3+17.6+3.9)MeV, where the first error is statistical and the second is systematic. The global significance of the new structure including systematic uncertainty is 5.2 standard deviations. We also find evidence for the e+e→ ϒ (1S)π+π process at the energy 10.52 GeV, which is below the BB¯ threshold. [Figure not available: see fulltext.]

Original languageEnglish
Article number220
JournalJournal of High Energy Physics
Volume2019
Issue number10
DOIs
Publication statusPublished - 2019 Oct 1

Keywords

  • Quarkonium
  • Spectroscopy
  • e+-e- Experiments

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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