Precision measurement of the B0s–B0s oscillation frequency with the decay B0s →D−sπ+
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Abstract
A 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 date
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Aaij, 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), 053021
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https://doi.org/10.1088/1367-2630/15/5/053021Sponsors
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© 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 DOI