Determination of the absolute branching fractions of D0 → K− e+ νe and D+ → K0 e+ νe

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+ → K0 e+ νe to be ( 3.567 ± 0.031stat ± 0.02 5syst) % and ( 8.68 ± 0.14stat ± 0.16syst)%, respectively. St...

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Bibliographic Details
Published in:Physical review. D 2021-09, Vol.104 (5), p.1
Main Author: Ablikim, M
Format: Article
Language:English
Subjects:
Decay
Mesons
Online Access:Get full text
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Summary: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+ → K0 e+ νe to be ( 3.567 ± 0.031stat ± 0.02 5syst) % 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 → Ke+ νe and D → K e− νe decays. The branching fractions reported in this work are consistent within uncertainties with previous BESIII measurements that selected events containing D → K e+ 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 ... 1.039 ± 0.021. This ratio supports isospin symmetry in the D0 → K− e+ νe and D+ →K0 e+ νe decays within 1.9σ.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.104.052008