LHCb CollaborationAdeva Andany, BernardoDosil Suárez, ÁlvaroFernández Albor, Víctor ManuelGallas Torreira, Abraham AntonioGarcía Pardiñas, JuliánHernando Morata, José ÁngelLucio Martínez, MiriamPlo Casasus, MáximoRomero Vidal, AntonioSaborido Silva, Juan JoséSanmartín Sedes, BraisSantamarina Ríos, CibránVázquez Regueiro, PabloVázquez Sierra, CarlosVieites Díaz, María2020-05-122020-05-122016Aaij, R., Adeva, B., Adinolfi, M. et al. First observation of the decay B0s → K0S K ∗(892)0 at LHCb. J. High Energ. Phys. 2016, 12 (2016). https://doi.org/10.1007/JHEP01(2016)0121029-8479http://hdl.handle.net/10347/22221A search for B0(s) → K0S K ∗(892)0 decays is performed using pp collision data, corresponding to an integrated luminosity of 1.0 fb−1, collected with the LHCb detector at a centre-of-mass energy of 7 TeV. The B 0s → K0S K ∗(892)0 decay is observed for the first time, with a significance of 7.1 standard deviations. The branching fraction is measured to be B(B0s→K¯0K∗(892)0)+B(B0s→K0K¯∗(892)0)=(16.4±3.4±2.3)×10−6, where the first uncertainty is statistical and the second is systematic. No evidence is found for the decay B 0 → K 0S K ∗(892)0 and an upper limit is set on the branching fraction, B(B0→K¯0K∗(892)0)+B(B0→K0K¯∗(892)0)<0.96×10−6 , at 90 % confidence level. All results are consistent with Standard Model predictions.eng© CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as 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.https://creativecommons.org/licenses/by/4.0/Hadron-Hadron scatteringB physicsjournal article10.1007/JHEP01(2016)012open access