Mesons comprising a beauty quark and strange quark can oscillate between particle (B0s) and antiparticle (anti-B0s) flavour eigenstates, with a frequency given by the mass difference between heavy and light mass eigenstates, Δm_s. Here we present a measurement of Δm_s using B0s → Ds− π+ decays produced in proton–proton collisions collected with the LHCb detector at the Large Hadron Collider. The oscillation frequency is found to be Δm_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 Δm_s precision by a factor of two. We combine this result with previous LHCb measurements to determine Δm_s = 17.7656 ± 0.0057 ps^−1, which is the legacy measurement of the original LHCb detector.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2022). Precise determination of the B-s(0)-B-s(-0) oscillation frequency. NATURE PHYSICS, 18(1), 54-58 [10.1038/s41567-021-01394-x].

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

Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Pisani, F.;Zucchelli, S.;
2022

Abstract

Mesons comprising a beauty quark and strange quark can oscillate between particle (B0s) and antiparticle (anti-B0s) flavour eigenstates, with a frequency given by the mass difference between heavy and light mass eigenstates, Δm_s. Here we present a measurement of Δm_s using B0s → Ds− π+ decays produced in proton–proton collisions collected with the LHCb detector at the Large Hadron Collider. The oscillation frequency is found to be Δm_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 Δm_s precision by a factor of two. We combine this result with previous LHCb measurements to determine Δm_s = 17.7656 ± 0.0057 ps^−1, which is the legacy measurement of the original LHCb detector.
2022
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2022). Precise determination of the B-s(0)-B-s(-0) oscillation frequency. NATURE PHYSICS, 18(1), 54-58 [10.1038/s41567-021-01394-x].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/849490
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