TTP13-039 Implications of an R-Scan for Charm Physics

The impact of improved measurements of the cross section for electron-positron annihilation into hadrons in the charm threshold region is discussed. Two aspects are studied in detail: i.)~A significant reduction of the experimental error of the electronic width of the narrow resonances $J/\psi$ and $\psi'$ and of the continuum cross section from the open charm threshold up to 4.6~GeV will lead to a correspondingly improved determination of the charmed quark mass. ii)~A high luminosity measurement with 24~pb${}^{-1}$ at three points and with a spacing of 2~MeV around $\sqrt{s}=3511\,{\rm MeV}$ may allow to observe the direct, resonant production of $\chi_{c1}$.