Mesons comprising a beauty quark and strange quark can oscillate between particle (B0s ) and antiparticle (B0s ) flavour eigen- states, with a frequency given by the mass difference between heavy and light mass eigenstates, Δms. Here we present a mea- surement of Δms using B0s → D−s π+ 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 com- bine 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.

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

Lusiani, A.;Morello, M. J.;Pica, L.;
2022

Abstract

Mesons comprising a beauty quark and strange quark can oscillate between particle (B0s ) and antiparticle (B0s ) flavour eigen- states, with a frequency given by the mass difference between heavy and light mass eigenstates, Δms. Here we present a mea- surement of Δms using B0s → D−s π+ 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 com- bine 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.
2022
Settore FIS/01 - Fisica Sperimentale
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/129084
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