RT Journal Article T1 Searches for 25 rare and forbidden decays of D+ and D+s mesons A1 LHCb Collaboration, A1 Adeva Andany, Bernardo A1 Alves Junior, Antonio Augusto A1 Baladrón Rodríguez, Pablo A1 Boente García, Óscar A1 Brea Rodríguez, Alexandre A1 Casais Vidal, Adrián A1 Chobanova, Veronika A1 Cid Vidal, Xabier A1 Dalseno, Jeremy A1 Dieste Maroñas, Lorena A1 Fernández Prieto, Antonio A1 Gallas Torreira, Abraham Antonio A1 García Plana, Beatriz A1 Gioventù, Alessandra A1 Lomba Castro, Julián A1 Martínez Santos, Diego A1 Parkinson, Chris J. A1 Plo Casasus, Máximo A1 Prouve, Claire A1 Ramos Pernas, Miguel A1 Romero Lamas, Marcos A1 Romero Vidal, Antonio A1 Saborido Silva, Juan José A1 Santamarina Ríos, Cibrán A1 Vázquez Regueiro, Pablo K1 Charm physics K1 Flavour physics K1 Flavour Changing Neutral Currents K1 Hadron-Hadron scattering (experiments) K1 Rare decay AB A 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 magnitude PB Springer YR 2021 FD 2021 LK http://hdl.handle.net/10347/26752 UL http://hdl.handle.net/10347/26752 LA eng NO J. High Energ. Phys. 2021, 44. https://doi.org/10.1007/JHEP06(2021)044 NO We acknowledge support from CERN and from the national agencies:CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3(France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSWand NCN (Poland); MEN/IFA (Romania); MSHE (Russia); MICINN (Spain); SNSFand SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF(U.S.A.). We acknowledge the computing resources that are provided by CERN, IN2P3(France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain),GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFINHH (Romania), CBPF (Brazil), PL-GRID (Poland) and OSC (U.S.A.). Individual groups or members have received support from AvH Foundation (Germany);EPLANET, Marie Skłodowska-Curie Actions and ERC (European Union); A*MIDEX,ANR, Labex P2IO and OCEVU, and Région Auvergne-Rhône-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, Thousand Talents Program, andSci. & Tech. Program of Guangzhou (China); RFBR, RSF and Yandex LLC (Russia);GVA, XuntaGal and GENCAT (Spain); the Royal Society and the Leverhulme Trust(United Kingdom) DS Minerva RD 25 abr 2026