1995/08/10 by Lawrence Gibbons, Gibbons, Lawrence
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex
paper · pdf · doi:10.48550/arxiv.hep-ex/9508012
Latex (world_sci and epsf macros), 8 pages, 3 figures. Talk presented at 30th Rencontres de Moriond: Electroweak Interactions and Unified Theories, Les Arcs, France, March, 1995
arxiv created 1995/08/10 · arxiv updated 2009/11/30
A preliminary analysis of exclusive \btou decays to the final states π^±ℓν, π0ℓν, ρ^±ℓν, ρ0ℓν and ωℓν based on 2.2\e6 \bbar decays collected at CLEO is presented. We have measured the first exclusive \btou branching fraction \bbpi=[1.19±0.41±0.21±0.19]\e-4 ([1.70±0.51±0.31±0.27]\e-4), with the ISGW (WSB) model used for efficiency determination. A 90% C.L. upper limit on \bbrho similar to the previous CLEO limit is obtained. The ratio \gamrho/\gampi<3.4 at the 90% confidence level for both the ISGW and WSB models. This ratio provides some discrimination between form factor models.