Speaker
Tatyana Kharlamova
(BINP, NSU)
Description
We report latest precise results on J/ψ and ψ(2S) parameters based on the data collected with the KEDR detector at the VEPP-4M e+e- collider.
Leptonic width of J/ψ meson and its composition to hadronic and electronic branching fractions
have been measured directly with the processes e+e- →hadrons and e+e- →e+e- at J/ψ
resonance energy range. The obtained accuracy is less than 2%.
The product of the electronic width of the ψ(2S) meson and the branching fraction of its decay to the muon pair has been measured in the
e+e−→ψ(2S)→μ+μ− process with the world best accuracy about 3%.
Leptonic width of ψ(2S) meson was calculated, using the previous KEDR measurements
with the lepton universality assumption and without it.
Primary author
Tatyana Kharlamova
(BINP, NSU)
