Physics Letters B 388 (1996) 402-408. doi:10.1016/S0370-2693(96)01163-XReceived by publisher: 1996-07-06Harvest Date: 2016-01-04 12:22:19DOI: 10.1016/S0370-2693(96)01163-XPage Range: 402-40

Using data collected with the CLEO II detector at the Cornell Electron Storage Ring, we present new measurements of the branching fractions for $D^{+}\to K_S{K}^{+}$ and $D^{+}\to K_S{\pi }^{+}$. These results are combined with other CLEO measurements to extract the ratios of isospin amplitudes and phase shifts for $D\to \mathrm{KK}$ and $D\to K\pi$.

We report a measurement of the magnitude of the ${\nu }_{\tau }$ helicity from $\tau$-pair events taken with the CLEO detector at the CESR electron-positron storage ring. Events in which each $\tau$ undergoes the decay $\tau \to h\nu$, with $h$ a charged pion or kaon, are analyzed for energy correlations between the daughter hadrons, yielding $|{\xi }_h|$ = $1.03\pm 0.06\pm 0.04$, with the first error statistical and the second systematic.