21-25 May 2018
Budker INP
Asia/Novosibirsk timezone

Charmonium at KEDR

22 May 2018, 17:00
20m
Budker INP

Budker INP

Lavrentiev av. 11, Novosibirsk 630090

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)

Presentation Materials