Speaker
Prof.
Haiming Hu
(IHEP， CAS)
Description
Using data samples collected with BESIII detector operating at BEPCII storage ring,
the R value is measured at 14 energy points from the center-of-mass energies 2.2324
to 3.671 GeV. This talk gives the descriptions and information for the data analysis,
the calculations of the initial state radiations and generators simulations.
(The average uncertainty of 14 R values is about 3%, which is dominated by the systematic uncertainty.)
Primary author
Prof.
Haiming Hu
(IHEP， CAS)
