First measurement ofΓ(D*+)and precision measurement ofmD*+−mD0

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Abstract

We present the first measurement of the ${D}^{*+}$ width using 9/fb of ${e}^{+}{e}^{\ensuremath{-}}$ data collected near the $\ensuremath{\Upsilon}(4\mathrm{S})$ resonance by the CLEO II.V detector. Our method uses advanced tracking techniques and a reconstruction method that takes advantage of the small vertical size of the CESR beam spot to measure the energy release distribution from the ${D}^{*+}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{+}$ decay. We find $\ensuremath{\Gamma}{(D}^{*+})=96\ifmmode\pm\else\textpm\fi{}4 (\mathrm{statistical})\ifmmode\pm\else\textpm\fi{}22 (\mathrm{systematic}) \mathrm{keV}.$ We also measure the energy release in the decay and compute $\ensuremath{\Delta}m\ensuremath{\equiv}{m}_{{D}^{*+}}\ensuremath{-}{m}_{{D}^{0}}=145.412\ifmmode\pm\else\textpm\fi{}0.002 (\mathrm{statistical})\ifmmode\pm\else\textpm\fi{}0.012 (\mathrm{systematic}) \mathrm{MeV}/{\mathrm{c}}^{2}.$

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