B. Geiser

Measurement of the branching fraction for [ital D][sup +][r arrow][ital K][sup [minus]][pi][sup +][pi][sup +]

Using the CLEO-II detector at CESR we have measured the ratio of branching fractions,

Measurement of the branching fraction [ital scrB]([tau][sup [minus]][r arrow][ital h][sup [minus]][r arrow][pi][sup 0][nu][sub [tau]])

{\cal B}(D^+\rightarrow K^- \pi^+ \pi^+)/{\cal B}(D^0 \rightarrow K^-\pi^+) = 2.35 \pm 0.16 \pm 0.16

First measurement of [Gamma]([ital D][sub [ital s]][sup +][r arrow][mu][sup +][nu])/[Gamma]([ital D][sub [ital s]][sup +][r arrow][phi][pi][sup +])

. Our recent measurement of

Two measurements of [ital B][sup 0][ital [bar B]0] mixing

{\cal B}(D^0 \rightarrow K^-\pi^+)

Measurement of the [tau]-lepton mass

then gives

D sub s sup + decays to. eta. pi. sup + and. eta. prime. pi. sup +

{\cal B}(D^+\rightarrow K^- \pi^+ \pi^+) = (9.3 \pm 0.6 \pm 0.8)\%

Two-body D sub s sup + decays to. eta. pi. sup + ,. eta. prime. pi. sup + ,. eta. rho. sup + ,. eta. prime. rho. sup + , and. phi. rho. sup +

.

Two-body Ds+ decays to , , , , and +

Using data from the CLEO II detector at the Cornell Electron Storage Ring, we measure [ital scrB]([tau][sup [minus]][r arrow][ital h][sup [minus]][pi][sup 0][nu][sub [tau]]) where [ital h][sup [minus]] refers to either [pi][sup [minus]] or [ital K][sup [minus]]. We use three different methods to measure this branching fraction. The combined result is [ital scrB]([tau][sup [minus]][r arrow][ital h][sup [minus]][pi][sup 0][nu][sub [tau]])=0.2587[plus minus]0.0012[plus minus]0.0042, in good agreement with standard model predictions.Using data from the CLEO II detector at CESR, we measure

Inclusive. chi. (2 P ) production in. Upsilon. (3 S ) decay

{\cal B}(\tau^\pm\rightarrow h^\pm\pi^0\nu_\tau)

Measurements of semileptonic branching fractions of B mesons at the Upsilon (4S) resonance.

where