The Ruds value in the vicinity of ψ(3770) state

The anomalous line shape of the ψ(3770)ψ(3770) state has resulted in some difficulty in the determination of the R   value for the continuum light hadron production in the resonance energy range. We parameterize the asymmetric line shape using a Fano-type formula and extract the RudsRuds value to be 2.156±0.0222.156±0.022 from the data of BESIII Collaboration in the energy region between 3.650 and 3.872 GeV. The small discrepancy between experiment and theory is removed. The cross sections of the e+e−→hadronse+e−→hadrons with continuum light hadron production subtracted are given and compared to the data of the e+e−→DD¯ reaction.