LHCb CollaborationAdeva Andany, BernardoÁlvarez Cartelle, PaulaDosil Suárez, ÁlvaroFernández Albor, Víctor ManuelGallas Torreira, Abraham AntonioHernando Morata, José ÁngelPazos Álvarez, AntonioPérez Trigo, EliseoPlo Casasus, MáximoRodríguez Pérez, PabloRomero Vidal, AntonioSaborido Silva, Juan JoséSanmartín Sedes, BraisSantamarina Ríos, CibránSeco Miguélez, Marcos AntonioVázquez Regueiro, Pablo2020-04-282020-04-282013Aaij, R., Beteta, C. A., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., ... & Ali, S. (2013). Precision measurement of the B0s–B0s oscillation frequency with the decay B0s →D−sπ+. New Journal of Physics, 15(5), 0530211367-2630http://hdl.handle.net/10347/21844A key ingredient to searches for physics beyond the Standard Model in B0s mixing phenomena is the measurement of the B0s – B0 s oscillation frequency, which is equivalent to the mass difference 1ms of the B0s mass eigenstates. Using the world’s largest B0s meson sample accumulated in a dataset, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb experiment at the CERN LHC in 2011, a measurement of 1ms is presented. A total of about 34 000B0s !D− s + signal decays are reconstructed, with an average decay time resolution of 44 fs. The oscillation frequency is measured to be 1ms = 17.768± 0.023 (stat) ±0.006 (syst) ps−1, which is the most precise measurement to dateeng© CERN 2013 for the benefit of the LHCb Collaboration, published under the terms of the Creative Commons Attribution 3.0 licence by IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Any further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation and DOIhttps://creativecommons.org/licenses/by/3.0/journal article10.1088/1367-2630/15/5/053021open access