Search for rare or forbidden decays of the D⁰ meson

2019/05/31 by J. P. Lees, V. Poireau, V. Tisserand +234 · 1 citation
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1103/physrevlett.124.071802

published as Phys. Rev. Lett. 124, 071802 (2020) · 8 pages, 2 figures

arxiv created 2020/02/19 · arxiv updated 2020/02/20

Abstract

We present a search for nine lepton-number-violating and three lepton-flavor-violating neutral charm decays of the type D⁰→ h^{′ -} h^-ℓ^{′ +} ℓ⁺ and D⁰→ h^{′ -} h⁺ℓ^′± ℓ^∓, where h and h^′ represent a K or π meson and ℓ and ℓ^′ an electron or muon. The analysis is based on 468 fb^-1 of e⁺e^- annihilation data collected at or close to the Y(4S) 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 (1.0 - 30.6)× 10^-7. The limits are between one and three orders of magnitude times more stringent than previous measurements.

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