Speaker
Mrs
Tatyana Kharlamova
(BINP, NSU)
Description
We report new precise results of experiments performed with the KEDR detector at the VEPP-4M e+e- collider.
They include final results for J/ψ and ψ(2S) parameters
and R measurement. Cross sections for the
processes e+e- →hadrons and e+e- → e+e- were measured at J/ψ
resonance energy range and leptonic width of J/ψ meson and its composition to hadronic and electronic branching fractions were
obtained with accuracy 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 was 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.
Recently the R was measured in the center-of-mass energy between 3.0 and 3.8 GeV with the total accuracy up to 2.6%.
Primary author
Mrs
Tatyana Kharlamova
(BINP, NSU)
