Garra Ticó, JordiGraugés Pous, EugeniBABAR Collaboration2019-04-082019-04-082011-10-281550-7998https://hdl.handle.net/2445/131758We present searches for rare or forbidden charm decays of the form X + c → h ± ℓ ∓ ℓ ( ' ) + , where X + c is a charm hadron ( D + , D + s , or Λ + c ), h ± is a pion, kaon, or proton, and ℓ ( ' ) ± is an electron or muon. The analysis is based on 384     fb − 1 of e + e − annihilation data collected at or close to the Υ ( 4 S ) resonance with the BABAR detector at the SLAC National Accelerator Laboratory. No significant signal is observed for any of the 35 decay modes that are investigated. We establish 90% confidence-level upper limits on the branching fractions between 1 × 10 − 6 and 44 × 10 − 6 depending on the channel. In most cases, these results represent either the first limits or significant improvements on existing limits for the decay modes studied.13 p.application/pdfeng(c) American Physical Society, 2011Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6020152019-04-08info:eu-repo/semantics/openAccess