2007/10/12 by Kazuo Abe, Abe, K.
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.0710.2548
openalex publication_date 2007/10/12 · openalex created_date 2018/09/27 · openalex updated_date 2026/07/28
Inclusive semileptonic Bs0 -> X+ l- νdecays are studied for the first time using a 23.6 fb-1 data sample collected on the Y(5S) resonance with the Belle detector at the KEKB asymmetric energy e+ e- collider. These decays are identified by the means of a lepton accompanied by a same-sign Ds+ meson originating from the other Bs0 in the event. The semileptonic branching fractions are measured in the electron and muon channels to be Bf(Bs0 -> X+ e- ν) = (10.9 ± 1.0 ± 0.9)% and Bf(Bs0 -> X+ μ- ν) = (9.2 ± 1.0 ± 0.8)%, respectively. Assuming an equal electron and muon production rate in Bs0 decays, a combined fit yields an average leptonic branching fraction Bf(Bs0 -> X+ l- ν) = (10.2 ± 0.8 ± 0.9)%.