Determination of Charm Hadronic Branching Ratios and New Modes

Precise measurements of the absolute branching fractions for D and Ds meson decays are important as they serve to normalize most B and Bs decays as well as many charm decays. Recent measurements from CLEO-c, BABAR, and Belle for the measurements of the absolute hadronic branching fractions of D and Ds mesons are presented here. Results from the CLEO-c experiment at the Cornell Electron Positron Storage Ring based on 281 pb recorded at the ψ(3770) are presented here for studies of D and D decays. In addition, CLEO-c has analyzed 195 pb of ee annihilation data near Ecm = 4170 MeV for studies of Ds decays. These samples provide very clean environments for studying decays of D and Ds mesons. The ψ(3770) produced in the ee annihilation decays to pairs of D mesons, either DD or DD̄. In particular, the produced D mesons can not be accompanied by any additional pions. At Ecm = 4170 MeV Ds mesons are primarily produced as D s D ∗− s and D ∗+ s D − s pairs. The results from BABAR and Belle use their large samples of ee data collected by these experiments. The different analyses presented here use integrated luminosities up to 0.55 ab. For example, Belle has used 0.55 ab to study D s → K Kπ in exclusive production of ee → D sDs1. BABAR has studied Ds → φπ using a sample of B → D D (∗) s(J) decays. These examples illustrate that charm produced both in the continuum and in B meson decays are useful for studies of charm at the B-factories. First I will discuss the determination of the absolute D and D branching fractions. New results from CLEO-c and BABAR are discussed here. Then results for Ds branching fractions from CLEO-c, Belle, and BABAR are presented. Last a few inclusive and rare hadronic decay modes are discussed.