Abstract

The product of the electronic width of the ψ(2S) meson and the branching fraction of its decay to the muon pair was measured in the e+e→ψ(2S)→μ+μ process using nine data sets corresponding to an integrated luminosity of about 6.5 pb−1 collected with the KEDR detector at the VEPP-4M electron–positron collider: Γee×Bμμ=19.3±0.3±0.5eV. Adding the previous KEDR results on hadronic and leptonic channels, the values of the ψ(2S) electronic width were obtained under two assumptions: either with the assumption of lepton universality Γee=2.279±0.015±0.042keV or without it, summing up hadronic and three independent leptonic channels Γee=2.282±0.015±0.042keV.

Original languageEnglish
Pages (from-to)174-181
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume781
DOIs
Publication statusPublished - 10 Jun 2018

Keywords

  • Branching fraction
  • Leptonic width
  • ψ(2S) meson
  • GENERATOR
  • MASSES
  • J/PSI-MESON
  • ANNIHILATION
  • KEDR DETECTOR
  • psi(2S) meson
  • MONTE-CARLO
  • WIDTHS
  • RADIATIVE-CORRECTIONS
  • LEPTON

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