Speaker
Yasemin Schelhaas
(JGU Mainz)
Description
At BESIII, the R value is measured with a total of 14 data points with the corresponding c.m. energy going from 2.2324 to 3.6710 GeV.
The statistical uncertainty of the measured R is less than 0.6%. Two different simulation models, the LUARLW and a new Hybrid generated, are used and give consistent detection efficiencies and initial-state-radiation corrections. An accuracy of better than 2.6% below 3.1 GeV and 3.0% above is achieved in the R values.
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Primary author
Yasemin Schelhaas
(JGU Mainz)
Co-author
Beijiang Liu
(Institute of High Energy Physics)
