Search for Rare or Forbidden Decays of the D^{0} Meson.


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Authors
Lees, JP 
Poireau, V 
Tisserand, V 
Grauges, E 
Palano, A 
Abstract

We present a search for nine lepton-number-violating and three lepton-flavor-violating neutral charm decays of the type D^{0}→h^{'-}h^{-}ℓ^{'+}ℓ^{+} and D^{0}→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 ϒ(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 1 and 3 orders of magnitude more stringent than previous measurements.

Description
Keywords
Charm physics, Flavour physics, Flavour Changing Neutral Currents, Hadron-Hadron scattering (experiments), Rare decay
Journal Title
Phys Rev Lett
Conference Name
Journal ISSN
1029-8479
1079-7114
Volume Title
2021
Publisher
American Physical Society (APS)