2026-04-13T06:13:49Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1749792025-12-05T16:37:15Zcom_2072_1057col_2072_478823col_2072_478917

00925njm 22002777a 4500 dc Graugés Pous, Eugeni author BABAR Collaboration author 2021-03-12T10:47:05Z 2021-03-12T10:47:05Z 2020-02-19 2021-03-12T10:47:05Z 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 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. Leptons (Física nuclear) Mètode de Montecarlo Leptons (Nuclear physics) Monte Carlo method Search for Rare or Forbidden Decays of the D-0 Meson