2015/05/15 by Justin Hietala, Dan Cronin-Hennessy, Hietala, Justin +5 · 2 citations
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex
paper · pdf · doi:10.48550/arxiv.1505.04205
18 pages, 3 figures
arxiv created 2015/05/29 · arxiv updated 2015/06/02
We measure absolute branching fractions for six exclusive Ds semileptonic decays. We use data collected in the CLEO-c detector from e+e- annihilations delivered by the Cornell Electron Storage Ring with a center-of-mass energy near 4170 MeV. We find B(Ds → ϕe ν)~= (2.14 ± 0.17 ± 0.09)%, B(Ds → ηe ν)~= (2.28 ± 0.14 ± 0.20)%, and B(Ds → η' e ν)~= (0.68 ± 0.15 ± 0.06)% for the largest modes, where the first uncertainties are statistical and the second are systematic. We also obtain B(Ds → K0 e ν)~= (0.39 ± 0.08 ± 0.03)%, B(Ds → K^* e ν)~= (0.18 ± 0.04 ± 0.01)%, and B(Ds → f0 e ν, f0 → ππ)~= (0.13 ± 0.02 ± 0.01)% for f0 masses within 60 MeV of 980 MeV. We use our results to determine the η-η' and f0 mixing angles with ss, and we combine our results with lattice calculations to estimate |Vcs|. This measurement improves upon the Ds semileptonic branching ratio precision and provides a new approach for future work that eliminates the Ds^* daughter photon reconstruction.