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Precise determination of the $B^0_S - \\bar {B}^0_S$ oscillation frequency
Precise determination of the $B^0_S - \\bar {B}^0_S$ oscillation frequency
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Precise determination of the $B^0_S - \\bar {B}^0_S$ oscillation frequency
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Precise determination of the $B^0_S - \\bar {B}^0_S$ oscillation frequency
Precise determination of the $B^0_S - \\bar {B}^0_S$ oscillation frequency

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Precise determination of the $B^0_S - \\bar {B}^0_S$ oscillation frequency
Precise determination of the $B^0_S - \\bar {B}^0_S$ oscillation frequency
Journal Article

Precise determination of the $B^0_S - \\bar {B}^0_S$ oscillation frequency

2022
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Overview
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.
Publisher
Nature Publishing Group (NPG)