ExclusiveDssemileptonic branching fraction measurements

Abstract

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 → φeν) = (2.14 ± 0.17 ± 0.08)%, B(Ds → ηeν) = (2.28 ± 0.14 ± 0.19)%, and B(Ds → η ′ eν) = (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 → K 0 eν) = (0.39 ± 0.08 ± 0.03)%, B(Ds → K * eν) = (0.18 ± 0.04 ± 0.01)%, and B(Ds → f0eν, f0 → ππ) = (0.13 ± 0.03 ± 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 D * s daughter photon reconstruction.

Measurements of the absolute branching fractions forDs+→ηe+νeAblikim1, Ачасов2, Ahmed3 et al. 2016Phys. Rev. D19340View full textAdd to dashboardCite

“…The maximum changes of the branching fractions are assigned as the uncertainties; they are found to be 0.3%, 0.6% and 0.3% for D [7][8][9] and the average values from PDG [4]. The branching fractions measured in this work are in good agreement with the previous measurements within uncertainties.…”

Measurements of the branching fractions for the semileptonic decays Ds+→ϕe+νAblikim1, Ачасов2, Ahmed3 et al. 2018Phys. Rev. D191120View full textAdd to dashboardCite

“…The ratios are consistent with unity within the uncertainties, and no obvious LU violation is observed. Moreover, the ratio of BðD þ s → ημ þ ν μ Þ over BðD þ s → η 0 μ þ ν μ Þ is calculated to be 0.44 AE 0.23, which is in agreement with those of previous measurements [5,7,8,39] within uncertainties and provides complementary data to probe the η − η 0 -glueball mixing.…”

“…However, the progress in the studies of the D þ s SL decays is still relatively slow. Up to now, only D þ s semi-electronic decays have been investigated by various experiments [5][6][7][8] and no measurements of D þ s semi-muonic decays have been reported. We here report the first measurements of the BFs of the semimuonic decays D þ s → ημ þ ν μ , η 0 μ þ ν μ and ϕμ þ ν μ as well as a measurement of the BF of the semi-electronic decay D þ s → ϕe þ ν e .…”

Chiral dynamics and S-wave contributions in semileptonicDs/Bsdecays intoπ+π−

“…Theoretical results are in good agreement with the CLEO results in Eqs. (3,4) [31][32][33]. We expect experimental errors will be greatly reduced since in future the BES-III collaboration will collect about 2f b −1 data in e + e − collision at the energy around 4.17GeV which will be used to study semileptonic and nonleptonic D s decays [34].…”