Using 2.93 fb-1 of e+e- collision data collected with the BESIII detector at a center-of-mass energy of 3.773 GeV, we measure the absolute branching fractions of the decays D0→K-e+νe and D+→K̄0e+νe to be (3.567±0.031stat±0.025syst)% and (8.68±0.14stat±0.16syst)%, respectively. Starting with the process e+e-→DD¯, a new reconstruction method is employed to select events that contain candidates for both D→K̄e+νe and D¯→Ke-ν¯e decays. The branching fractions reported in this work are consistent within uncertainties with previous BESIII measurements that selected events containing D→K̄e+νe and hadronic D¯ decays. Combining our results with the lifetimes of the D0 and D+ mesons and the previous BESIII measurements leads to a ratio of the two decay partial widths of Γ¯D0→K-e+νeΓ¯D+→K̄0e+νe=1.039±0.021. This ratio supports isospin symmetry in the D0→K-e+νe and D+→K̄0e+νe decays within 1.9σ.

Determination of the absolute branching fractions of D0→K−e+νe and D+→K¯0e+νe

Garzia, I.;Scodeggio, M.;
2021

Abstract

Using 2.93 fb-1 of e+e- collision data collected with the BESIII detector at a center-of-mass energy of 3.773 GeV, we measure the absolute branching fractions of the decays D0→K-e+νe and D+→K̄0e+νe to be (3.567±0.031stat±0.025syst)% and (8.68±0.14stat±0.16syst)%, respectively. Starting with the process e+e-→DD¯, a new reconstruction method is employed to select events that contain candidates for both D→K̄e+νe and D¯→Ke-ν¯e decays. The branching fractions reported in this work are consistent within uncertainties with previous BESIII measurements that selected events containing D→K̄e+νe and hadronic D¯ decays. Combining our results with the lifetimes of the D0 and D+ mesons and the previous BESIII measurements leads to a ratio of the two decay partial widths of Γ¯D0→K-e+νeΓ¯D+→K̄0e+νe=1.039±0.021. This ratio supports isospin symmetry in the D0→K-e+νe and D+→K̄0e+νe decays within 1.9σ.
2021
Ablikim, M.; Achasov, M.  N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, M.  R.; An, Q.; Bai, X.  H.; Bai, Y.; Bakina, O.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2506032
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