Semi-inclusive studies of semileptonic $B_s$ decays at Belle

分类： 物理学 >> 核物理学 提交时间： 2016-09-09

Oswald, C. and others

摘要： We present an analysis of the semi-inclusive decays Bs→D−sXℓ+ν and Bs→D∗−sXℓ+ν, where Xdenotes a final state that may consist of additional hadrons or photons and ℓ is an electron or muon. The studied Bs decays are contained in the 121.4 fb−1 Υ(5S) data sample collected by the Belle detector at the KEKB asymmetric-energy e+e− collider. The branching fractions of the decays are measured to be B(Bs→D−sXℓ+ν)=[8.2±0.2(stat)±0.6(syst)±1.4(ext)]% and B(Bs→D∗−sXℓ+ν)=[5.4±0.4(stat)±0.4(syst)±0.9(ext)]%, where the first two uncertainties are statistical and systematic and the last is due to external parameters. The measurement also provides an estimate of the B(∗)sB¯(∗)s production cross-section, σ(e+e−→B(∗)sB¯(∗)s)=(53.8±1.4(stat)±4.0(syst)±3.4(ext))pb, at the center-of-mass energy s√=10.86GeV.

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