Determination of the absolute branching fractions of D0 →k-e+νe and D+ → K ¯ 0e+νe DETERMINATION of the ABSOLUTE BRANCHING FRACTIONS ... ABLIKIM M. et al.

BESIII Collaboration

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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.

Original languageEnglish (US)
Article number052008
JournalPhysical Review D
Volume104
Issue number5
DOIs
StatePublished - Sep 1 2021
Externally publishedYes

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Publisher Copyright:
© 2021 authors. Published by the American Physical Society. Funded by SCOAP3.

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