A key ingredient to searches for physics beyond the Standard Model in B s- 0 mixing phenomena is the measurement of the B s- 0 oscillation frequency, which is equivalent to the mass difference Δm s of the B s- 0 mass eigenstates. Using the world's largest B s- 0 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 Δm s is presented. A total of about 34 000 B s- 0 → D sπ -+ signal decays are reconstructed, with an average decay time resolution of 44 fs. The oscillation frequency is measured to be Δm s = 17.768 ± 0.023 (stat) ± 0.006 (syst) ps -1, which is the most precise measurement to date.
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)