Abstract
We present a search for nine lepton-number-violating and three lepton-flavor-violating neutral charm decays of the type and , where and represent a or meson and and an electron or muon. The analysis is based on of annihilation data collected at or close to the resonance with the BABAR detector at the SLAC National Accelerator Laboratory. No significant signal is observed for any of the twelve modes, and we establish 90% confidence level upper limits on the branching fractions in the range . The limits are between 1 and 3 orders of magnitude more stringent than previous measurements.
- Received 16 May 2019
- Accepted 23 January 2020
DOI:https://doi.org/10.1103/PhysRevLett.124.071802
Published 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 Society