Precise determination of the Bs0–B¯s0 oscillation frequency

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, Δ m s . Here we present a measurement of Δ m s using B s 0 → D s − π +...

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Bibliographic Details
Published in:	Nature physics Vol. 18; no. 1; pp. 1 - 5
Main Authors:	Akar, S, Alkhazov, G, Andreotti, M, Archilli, F, Artamonov, A, Audurier, B, Belin, S, Belous, K, Belov, I, Belyaev, I, Bertolin, A, Bezshyiko Ia, Bhasin, S, Bishop, F C, Boettcher, T, Boyer, A, Bursche, A, Butter, J S, Carus, L, Cattaneo, M, Charles, M, Chen, S, Chobanova, V, Chrzaszcz, M, Cicala, M F, Cobbledick, J L, Coco, V, Coelho J A B, Contu, A, Currie, R, H-P, Dembinski, Di, Nezza P, Dobishuk, V, Duk, V, Dziurda, A, Dzyuba, A, Eschle, J, Féo, M, Fiorini, M, Geertsema, R E, Gerick, D, Gerken, L L, Gersabeck, M, Giemza, H K, Giugliano, C, Gromov, S, Haimberger, J, Halewood-leagas, T, Hammerich, J P, Han, Q, Hancock, T H, Hecker, M, Huang, X, Jans, E, Jezabek, M, Kravchenko, P, Kreps, M, Li L, Lupton, O, Mariani, S, Marshall, P J, Materok, M, Merk, M, Milovanovic, M, Mombächer, T, Morris, A G, Müller, K, Palano, A, Petric, M, Polukhina, N, Poslavskii, S, Trejo R I Rabadan, Ren, Z, Rodrigues, A B, Saitta, B, Santimaria, M, Satriano, C, Schune, M H, Sciascia, B, Sestini, L, Shapkin, M, Shupperd, J D, Solovev, A, Solovyev, I, Spaan, B, Spradlin, P, Stenyakin, O, Sun, Y, Tisserand, V, Van Dijk M, Van Hulse C B, Vecchi, S, Veltri, M, Veronesi, M, Voropaev, N, Wilkinson, G, Yang, Z, Zhang, D, Zhou, Y, Zhu, Z
Format:	Journal Article
Language:	English
Published:	London Nature Publishing Group UK 2022 Nature Publishing Group
Subjects:	639/766/419/1131 639/766/419/1132 Atomic Classical and Continuum Physics Complex Systems Condensed Matter Physics Eigenvectors Flavor (particle physics) Large Hadron Collider Mathematical and Computational Physics Mesons Molecular Optical and Plasma Physics Particle collisions Physics Physics and Astronomy Protons Quarks Theoretical
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Summary:	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, Δ m s . Here we present a measurement of Δ m s using B s 0 → 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 Δ 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 Δ m s precision by a factor of two. We combine this result with previous LHCb measurements to determine Δ m s = 17.7656 ± 0.0057 ps −1 , which is the legacy measurement of the original LHCb detector. The LHCb collaboration reports an improved measurement of the oscillation frequency of mesons consisting of a bottom quark and strange quark, which is then combined with previous results.
ISSN:	1745-2473 1745-2481
DOI:	10.1038/s41567-021-01394-x