The branching fractions of Ds± meson decays serve to normalize many measurements of processes involving charm quarks. Using 586 pb-1 of e+e- collisions recorded at a center of mass energy of 4.17 GeV, we determine absolute branching fractions for 13 Ds± decays in 16 reconstructed final states with a double tag technique. In particular we make a precise measurement of the branching fraction B(Ds→K -K+π+)=(5.55±0.14±0.13)%, where the uncertainties are statistical and systematic, respectively. We find a significantly reduced value of B(Ds→π+π0η ′) compared to the world average, and our results bring the inclusively and exclusively measured values of B(D s→η′X) into agreement. We also search for CP-violating asymmetries in Ds decays and measure the cross section of e+e-→Ds*Ds at Ecm=4.17 GeV.
ASJC Scopus subject areas
- Nuclear and High Energy Physics