Georg Viehhauser

Abstract:

The decays Υ(4S)→BB, followed by B→D*π and D*→Dπ, permit reconstruction of all kinematic quantities that describe the sequence without reconstruction of the D, with reasonably low backgrounds. Using an integrated e+e− luminosity of 3.1fb−1 accumulated at the Υ(4S) by the CLEO-II detector, we report measurements of B(B0→D*+π−)=(2.81±0.11±0.21±0.05)×10−3 and B(B−→D*0π−)=(4.34±0.33±0.34±0.18) ×10−3. © 1998 The American Physical Society.

Abstract:

We have studied two-body charmless hadronic decays of B mesons into the final states ΠΠKΠand KK. Using 3.3 × 106 BB¯ pairs collected with the CLEO-II detectorwe have made the first observation of the decay B0 → K+Π-the sum of B+ → Π+Π0 and B+ → K+Π0 decaysand see strong evidence for the decay B+ → K0Π+ (an average over charge-conjugate states is always implied). We place upper limits on branching fractions for the remaining decay modes. © 1998 The American Physical Society.

Abstract:

We report the first observation of B → η′X transitions with high momentum η′ mesons. We observe 39.0 ± 11.6B decay events with 2.0 < pη′ < 2.7GeV/c, the high momentum region where background from b → c processes is suppressed. We discuss the physical interpretation of the signal, including the possibility that it is due to b → sg* transitions. Given that interpretation, we find B(B → η′Xs) = [6.2 ± 1.6(stat) ± 1.3(syst)+0.0-1.5(bkg)] × 10-4 for 2.0 < pη′ < 2.7GeV/c. © 1998 The American Physical Society.

Abstract:

We have observed a signal for the decay D*+→D+γ deviations. From the measured branching ratio B(D*+→D+γ)/B(D*+→D+π0)=0.055±0.014±0.010 we find B(D*+→D+γ) =0.017±0.004±0.003, where the first uncertainty is statistical and the second is systematic. We also report the highest precision determination of the remaining D*+ branching fractions. © 1998 The American Physical Society.