Georg Viehhauser

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.

Abstract:

Using (Formula presented) of data accumulated at the (Formula presented) by the CLEO-II detector, corresponding to (Formula presented) (Formula presented) pairs, we have searched for the color-suppressed (Formula presented) hadronic decay processes (Formula presented) where (Formula presented) is a light neutral meson (Formula presented) (Formula presented) η, (Formula presented) or ω. The (Formula presented) mesons are reconstructed in (Formula presented) and the (Formula presented) mesons in (Formula presented) (Formula presented) and (Formula presented) decay modes. No obvious signal is observed. We set 90% C.L. upper limits on these modes, varying from (Formula presented) for (Formula presented) to (Formula presented) for (Formula presented). © 1998 The American Physical Society.

Abstract:

We have searched for the effective flavor changing neutral-current decays b → sl+l- using an inclusive method. We set upper limits on the branching ratios B(b → se+e-) < 5.7 × 10-5, B(b → sμ+μ-) < 5.8 × 10-5, and B(b → se±μ±) < 2.2 × 10-5 [at 90% confidence level (C.L.)]. Combing the dielectron and dimuon decay modes we find B(b → sl+l-) < 4.2 × 10-5 (at 90% C.L.). © 1998 The American Physical Society.