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Journal Article

Precise determination of the B-s(0)-B-s(-0) oscillation frequency


Schmelling,  M.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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The LHCb Collaboration, Aaij, R., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., et al. (2022). Precise determination of the B-s(0)-B-s(-0) oscillation frequency. Nature Physics, 18(1), 1-5. doi:10.1038/s41567-021-01394-x.

Cite as: https://hdl.handle.net/21.11116/0000-000A-E08A-D
Mesons comprising a beauty quark and strange quark can oscillate between particle (B-s(0)) and antiparticle (B-s(-0)) flavour eigenstates, with a frequency given by the mass difference between heavy and light mass eigenstates, Delta m(s). Here we present a measurement of Delta m(s) using B-s(0) -> D-s(-)pi(+) decays produced in proton-proton collisions collected with the LHCb detector at the Large Hadron Collider. The oscillation frequency is found to be Delta m(s) = 17.7683 +/- 0.0051 +/- 0.0032 ps(-1), where the first uncertainty is statistical and the second is systematic. This measurement improves on the current Delta m(s) precision by a factor of two. We combine this result with previous LHCb measurements to determine Delta m(s) = 17.7656 +/- 0.0057 ps(-1), which is the legacy measurement of the original LHCb detector.