Precise determination of the $$B^0_S - \bar {B}^0_S$$ oscillation frequency
Mesons comprising a beauty quark and strange quark can oscillate between particle ($$B^0_s$$) and antiparticle ($$\bar{B}^0_s$$) flavour eigenstates, with a frequency given by the mass difference between heavy and light mass eigenstates, Δms. Here we present a measurement of Δms using $$B^0_s$$ → $$D^–_sπ^+$$ decays produced in proton–proton collisions collected with the LHCb detector at the Large Hadron Collider. The oscillation frequency is found to be Δms = 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 Δms precision by a factor of two. We combine this result with previous LHCb measurements to determine Δms = 17.7656 ± 0.0057 ps–1, which is the legacy measurement of the original LHCb detector.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC). Nuclear Physics (NP)
- Contributing Organization:
- LHCb Collaboration
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1972104
- Report Number(s):
- LA-UR-21-23542
- Journal Information:
- Nature Physics, Journal Name: Nature Physics Journal Issue: 1 Vol. 18; ISSN 1745-2473
- Publisher:
- Nature Publishing Group (NPG)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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