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Precision measurement of the B0s-overlineB{}^0_s oscillation frequency with the decay B0s → D-sπ+
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A key ingredient to searches for physics beyond the Standard Model in B0s mixing phenomena is the measurement of the B0s- ${{\overline{ {\mathrm {B}}}{}}^0_{\mathrm { s}}}$ oscillation frequency, which is equivalent to the mass difference Δms 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 Δms is presented. A total of about 34 000 B0s → D−sπ+ signal decays are reconstructed, with an average decay time resolution of 44 fs. The oscillation frequency is measured to be Δms = 17.768 ± 0.023 (stat) ± 0.006 (syst) ps−1, which is the most precise measurement to date.
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LHCb Collaboration, et al. Precision measurement of the B0s-overlineB{}^0_s oscillation frequency with the decay B0s → D-sπ+. New Journal of Physics. 2013. Vol. 15, num. 5, pags. 1-16. ISSN 1367-2630. [consulted: 9 of June of 2026]. Available at: https://hdl.handle.net/2445/185579