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Precision measurement of the Bºs - Bºs oscillation frequency with the decay Bºs → Dsπ+
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P.). (2013) Precision measurement of the Bºs - Bºs oscillation frequency with the decay Bºs → Dsπ+. New Journal of Physics, 15 . 053021 . doi:10.1088/1367-2630/15/5/053021 ISSN 1367-2630.
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WRAP_LCHb_1367-2630_15_5_053021.pdf - Published Version Available under License Creative Commons Attribution. Download (734Kb) | Preview |
Official URL: http://dx.doi.org/10.1088/1367-2630/15/5/053021
Abstract
A key ingredient to searches for physics beyond the Standard Model in Bºs mixing phenomena is the measurement of the Bºs– B¯ºs oscillation frequency, which is equivalent to the mass difference Δms of the Bºs mass eigenstates. Using the world's largest Bºs 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 Bºs → 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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