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+→K¯0e+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→K¯e+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→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 Γ¯D0→K−e+νeΓ¯D+→K¯0e+νe=1.039±0.021. This ratio supports isospin symmetry in the D0→K−e+νe and D+→K¯0e+νe decays within 1.9σ.Received 17 April 2021Accepted 15 July 2021DOI:https://doi.org/10.1103/PhysRevD.104.052008Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBranching fractionLeptonic, semileptonic & radiative decaysPhysical SystemsCharmed mesonsTechniquesLepton collidersParticles & Fields
Highlights
Experimental studies of semileptonic D0ðþÞ decays are important for our understanding of the strong and weak interactions in charmed meson decays
The cylindrical core of the BESIII detector consists of a helium-based multilayer drift chamber (MDC), a plastic scintillator time-of-flight system (TOF), and a CsI(Tl) electromagnetic calorimeter (EMC), which are all enclosed in a superconducting solenoidal magnet
We identify FSR photons as EMC showers that occur within 15° of the electron’s initial direction
Summary
Experimental studies of semileptonic D0ðþÞ decays are important for our understanding of the strong and weak interactions in charmed meson decays. Among all exclusive semileptonic D0ðþÞ decays, the D0 → K−eþνe and Dþ → K 0eþνe decays have the largest branching fractions, the cleanest experimental signatures, and the highest event yields. Measuring fKþð0Þ tests key predictions from lattice QCD calculations, and measuring jVcsj probes the unitarity of the CKM matrix.
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