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Measurement of the B.sup.0./sup..sub.S./sub. → μμ effective lifetime with the ATLAS detector

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    0576719 - FZÚ 2024 RIV DE eng J - Journal Article
    Aad, G. - Abbott, B. - Abeling, K. - Chudoba, Jiří - Federičová, Pavla - Hejbal, Jiří - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2983 authors
    Measurement of the B0S → μμ effective lifetime with the ATLAS detector.
    Journal of High Energy Physics. Roč. 2023, č. 9 (2023), č. článku 199. ISSN 1029-8479. E-ISSN 1029-8479
    Research Infrastructure: CERN-CZ III - 90240
    Institutional support: RVO:68378271
    Keywords : ATLAS * B0S:lifetime * decay: time * CERN LHC Coll
    OECD category: Particles and field physics
    Impact factor: 5.4, year: 2022
    Method of publishing: Open access

    This paper reports the first ATLAS measurement of the Bs0Bs0​→ μμ effective lifetime. The measurement is based on the data collected in 2015–2016, amounting to 26.3 fb−1−1 of 13 TeV LHC proton-proton collisions. The proper decay-time distribution of 58 ± 13 background-subtracted signal candidates is fit with simulated signal templates parameterised as a function of the Bs0Bs0​ effective lifetime, with statistical uncertainties extracted through a Neyman construction. The resulting effective measurement of the Bs0Bs0​→ μμ lifetime is 0.99−0.07+0.420.99−0.07+0.42​ (stat.) ± 0.17 (syst.) ps and it is found to be consistent with the Standard Model.
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