Direct Measurements of Charmed- D -Meson Hadronic Branching Fractions

A new technique is applied to data collected at the ψ(3770) resonance to derive charmed-D-meson branching fractions without relying on the measurement of D-production cross sections. Measurements are presented for three decay modes of the ${D}⁰ ({K}^{{-}}{{π}}⁺, {D}^{{-}}{{π}}^{{-}}{{π}}⁺{{π}}⁺, and {K}^{{-}}{{π}}⁺{{π}}⁰$ and four decay modes of the ${D}⁺ ({K}^{{-}}{{π}}⁺{{π}}⁺,{K}^{{-}}{{π}}⁺{{π}}⁺{{π}}⁰,{K}S⁰{{π}}⁺, and {K}S⁰{{π}}⁺{{π}}⁰)$. The resulting branching fractions are significantly larger than previous measurements.