Upper limit on the D*(2010) decay width

We report a measurement of the upper limit of the decay width for the D*+(2010) meson using the High Resolution Spectrometer at PEP. We observed the charged D* production in the decay mode of D*+ → D0π+ with the D0 decaying into the K-π+ mode. The peak in the mass difference distribution M(K-π+π+)-M(K-π+) was used to directly measure the decay width. The width is dominated by the detector resolution and the preliminary result is an upper limit on the full width of Γ/sub D*/ < 1.15 MeV/c2 at 90% C.L. 7 refs., 2 figs