Georg Viehhauser

Abstract:

We have studied semileptonic B meson decays with a p-wave charm meson in the final state using 3.29×10⁶BB^¯ events collected with the CLEO II detector at the Cornell Electron-Positron Storage Ring.We find a value for the exclusive semileptonic product branching fraction B(B⁻→D1⁰ℓ⁻ν^¯ℓ)B(D1⁰→D*+π⁻) = (0.373±0.085±0.052±0.024)% and an upper limit for B(B⁻→D2^*0ℓ-ν^¯ℓ)B(D2^*0→D*+π⁻)<0.16% (90% C.L.).Furthermore, we present the first measurement of the q² spectrum for B⁻→D1⁰ℓ⁻ν^¯ℓ. © 1998 The American Physical Society.

Abstract:

Using a data sample with an integrated luminosity of 3.9 fb^-1 collected in e⁺e^- annihilation with the CLEO-II detector at the Cornell Electron Storage Ring, we have measured the branching ratios for the decay modes Ds⁺→(η,η′)π⁺ and Ds⁺→(η,η′)ρ⁺ relative to Ds⁺→φ⁺. These decay modes are among the most common hadronic decays of the Ds⁺ , and can be related by factorization to the semileptonic decays Ds⁺ →(η,η′)ℓ⁺νl. The results obtained are compared with previous CLEO results and with the branching ratios measured for the related semileptonic decays. We also report results on the Cabibbo-suppressed decays of the D⁺ to the same final states. © 1998 The American Physical Society.

Abstract:

Using data recorded by the CLEO-II detector at CESR, we report new measurements of the branching fractions for the decays of the charmed baryon Λc+ into pK-π+π0, pK0, pK0π+π-, and pK0π0, all measured relative to pK-π+. The relative branching fractions are 0.67±0.04±0.11,0.46±0.02±0.04,0.52±0.04±0.05, and 0.66±0.05±0.07, respectively. © 1998 The American Physical Society.

Abstract:

Using the CLEO detector at the Cornell Electron Storage Ring, we have made a measurement of (Formula presented) at (Formula presented)=10.52 GeV. This implies a value for the strong coupling constant of (Formula presented), or (Formula presented). © 1998 The American Physical Society.

Abstract:

We present a measurement of the absolute branching fraction for D0 → K-π+ using the reconstruction of the decay chain ¯ B → D*+ Xℓ- ¯v where only the lepton and the low-momentum pion from the D*+ are detected. With data collected by the CLEO II detector at the Cornell Electron Storage Ring, we have determined B(D0 → K-π+)=[3.81±0.15(stat)±0.16(syst)]%. © 1998 The American Physical Society.