LHCb CollaborationAdeva Andany, BernardoAlves Junior, Antonio AugustoBaladrón Rodríguez, PabloBoente García, ÓscarBrea Rodríguez, AlexandreCasais Vidal, AdriánChobanova, VeronikaCid Vidal, XabierDalseno, JeremyDieste Maroñas, LorenaFernández Prieto, AntonioGallas Torreira, Abraham AntonioGarcía Plana, BeatrizGioventù, AlessandraLomba Castro, JuliánMartínez Santos, DiegoParkinson, Chris J.Plo Casasus, MáximoProuve, ClaireRamos Pernas, MiguelRomero Lamas, MarcosRomero Vidal, AntonioSaborido Silva, Juan JoséSantamarina Ríos, CibránVázquez Regueiro, Pablo2021-08-102021-08-102021J. High Energ. Phys. 2021, 44. https://doi.org/10.1007/JHEP06(2021)044http://hdl.handle.net/10347/26752A search is performed for rare and forbidden charm decays of the form D+(s)→h±ℓ+ℓ(′)∓, where h± is a pion or kaon and ℓ(′)± is an electron or muon. The measurements are performed using proton-proton collision data, corresponding to an integrated luminosity of 1.6 fb−1, collected by the LHCb experiment in 2016. No evidence is observed for the 25 decay modes that are investigated and 90 % confidence level limits on the branching fractions are set between 1.4 × 10−8 and 6.4 × 10−6. In most cases, these results represent an improvement on existing limits by one to two orders of magnitudeengCopyright CERN, for the benefit of the LHCb Collaboration, 2021. Open Access . This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are creditedAtribución 4.0 Internacionalhttp://creativecommons.org/licenses/by/4.0/Charm physicsFlavour physicsFlavour Changing Neutral CurrentsHadron-Hadron scattering (experiments)Rare decayjournal article10.1007/JHEP06(2021)0441029-8479open access