Aaij, RoelAdeva Andany, BernardoBorsato, MartinoChobanova, VeronikaCid Vidal, XabierDosil Suárez, ÁlvaroFernández Prieto, AntonioGallas Torreira, Abraham AntonioGarcía Pardiñas, JuliánLemos Cid, EdgarLucio Martínez, MiriamMartínez Santos, DiegoPlo Casasus, MáximoPrisciandaro, JessicaRamos Pernas, MiguelRomero Vidal, AntonioSaborido Silva, Juan JoséSanmartín Sedes, BraisSantamarina Ríos, CibránVázquez Regueiro, PabloVieites Díaz, MaríaVázquez Sierra, CarlosLHCb Collaboration2018-05-312018-05-312017-10-13Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., & Albrecht, J. et al. (2017). Improved limit on the branching fraction of the rare decay K0S→μ+μ−. The European Physical Journal C, 77(10). doi: 10.1140/epjc/s10052-017-5230-xhttp://hdl.handle.net/10347/16744A search for the decay K0S→μ+μ− is performed, based on a data sample of proton-proton collisions corresponding to an integrated luminosity of 3 fb −1 , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV . The observed yield is consistent with the background-only hypothesis, yielding a limit on the branching fraction of BF(K0S→μ+μ−)<0.8 (1.0)×10−9 at 90% (95%) confidence level. This result improves the previous upper limit on the branching fraction by an order of magnitudeeng© CERN for the benefit of the LHCb collaboration 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecomm ons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAPhttps://creativecommons.org/licenses/by/4.0/Kaon physicsFlavour physicsParticle physicsExperimental physicsMaterias::Investigación::22 Física::2208 Nucleónica::220807 Física de partículasjournal article10.1140/epjc/s10052-017-5230-xopen access