D. S. Crowcroft

Measurements of the decays tau(-) -> h(-)h(+)h(-)nu(tau) and tau(-) -> h(-)h(+)h(-)pi(0)nu(tau)

We use a data sample of 2.8 × 10 6 produced τ-pair events, obtained with the CLEO II detector, to measure B(τ - Ⅵh - h + h - (π 0 )ν τ ), where h refers to either a charged π or K. These branching fractions are measured with samples of lepton-tagged and 3 vs 3 events. We find B(τ - Ⅵh - h + h - ν τ )=0.0951±0.0007±0.0020 and B(τ - Ⅵh - h + h - π 0 ν τ )=0.0423±0.0006±0.0022. We also measure B(τ - Ⅵωh - ν τ )=0.0195±0.0007±0.0011.

Measurement of the Decay Amplitudes and Branching Fractions of {ital B} {r_arrow} {ital J/}{psi}{ital K*} and {ital B} {r_arrow} {ital J/}{psi}{ital K} Decays

Using data taken with the CLEO II detector, we present the first full angular analysis in the color-suppressed modes B{sup 0} {yields} J/{psi} K*{sup 0} and B{sup +} {yields} J/{psi} K*{sup +}. This leads to a complete determination of the decay amplitudes of these modes. In addition, we update the branching fractions for B {yields} J/{psi} K and B {yields} J/{psi} K*.

Study of the B0 semileptonic decay spectrum at the Y(4S) resonance

We have made a first measurement of the lepton momentum spectrum in a sample of events enriched in neutral Bs through a partial reconstruction of B{sup 0} {yields} D*{sup -}{ell}{sup +}{nu}. This spectrum, measured with 2.38 fb{sup -1} of data collected at the {Upsilon}(4S) resonance by the CLEO II detector, is compared directly to the inclusive lepton spectrum from all {Upsilon}(4S) events in the same data set. These two spectra are consistent with having the same shape above 1.5 GeV/c. From the two spectra and two other CLEO measurements, we obtain the B{sup 0} and B{sup +} semileptonic branching fractions, b{sub 0} and b{sub +}, their ratio, and the production ratio f{sub +-}/f{sub 00} of B{sup +} and B{sup 0} pairs at the {Upsilon}(4S). We report b{sub +}/b{sub 0} = 0.950{sub -0.080}{sup +0.117} {+-} 0.091, b{sub 0} = (10.78 {+-} 0.60 {+-} 0.69)%, and b{sub +} = (10.25 {+-} 0.57 {+-} 0.65)%. b{sub +}/b{sub 0} is equivalent to the ratio of charged to neutral B lifetimes, {tau}{sub +}/{tau}{sub 0}.

Observation of the Decay D s + → ωπ +

Using e{sup +}e{sup {minus}} annihilation data collected by the CLEOII detector at CESR, we have observed the decay D{sup +}{sub s}{r_arrow}{omega}{pi}{sup +} . This final state may be produced through the annihilation decay of the D{sup +}{sub s} , or through final state interactions. We find a branching ratio of {Gamma}(D{sup +}{sub s}{r_arrow}{omega}{pi}{sup +})/{Gamma}(D{sup +}{sub s}{r_arrow} {eta}{pi}{sup +})=0.16{plus_minus}0.04{plus_minus}0 .03 , where the first error is statistical and the second is systematic. {copyright} {ital 1997} {ital The American Physical Society}Using e+e- annihilation data collected by the CLEO~II detector at CESR, we have observed the decay Ds+ to omega pi+. This final state may be produced through the annihilation decay of the Ds+, or through final state interactions. We find a branching ratio of [Gamma(Ds+ to omega pi+)/Gamma(Ds+ to eta pi+)]=0.16+-0.04+-0.03, where the first error is statistical and the second is systematic.

Observation of Two Narrow States Decaying into {Xi}{sup +}{sub c} {gamma} and {Xi}{sup 0}{sub c} {gamma}

We report the rst observation of two narrow charmed strange baryons decaying to + c and 0 c , respectively, using data from the CLEO II detector at CESR. We interpret the observed signals as the +0

First Observation of the Decay B{sup 0} {r_arrow} D{sup {asterisk}+}D {sup {asterisk}{minus}}

We have observed four fully reconstructed B0 -> D*+D*- candidates in 5.8 million Upsilon(4S) -> BBbar decays recorded with the CLEO detector. The background is estimated to be 0.31 +- 0.10 events. The probability that the background could produce four or more signal candidates with the observed distribution among D*+ and D*- decay modes is 1.1 X 10^{-4}. The measured decay rate, Br(B0 -> D*+D*-) = [6.2 +4.0-2.9 (stat) +- 1.0(syst)] X 10^{-4}, is large enough for this decay mode to be of interest for the measurement of a time-dependent CP asymmetry.

Measurement of the B {r_arrow} D scr(l){nu} Branching Fractions and Form Factor

Using a sample of 3.3 million B-meson decays collected with the CLEO detector at the Cornell Electron Storage Ring, we have studied

Observation of the Radiative Decay {ital D}{sup *+}{r_arrow}{ital D}{sup +}{gamma}

B^- \to D^0 \ell\nu

Two-Body {ital B} Meson Decays to {ital {eta}} and {ital {eta}}{sup {ital {prime}}} : Observation of {ital B{r_arrow}{eta}}{sup {ital {prime}}}{ital K}

and

Search for the Decays {ital B}{sup 0}{r_arrow}{ital D}{sup ({asterisk})+}{ital D}{sup ({asterisk}){minus}}

\bar{B}^0 \to D^+ \ell\nu