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Measurement of the B s 0 → μμ effective lifetime with the ATLAS detector

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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Article number199
<mark>Journal publication date</mark>28/09/2023
<mark>Journal</mark>Journal of High Energy Physics
Issue number9
Volume2023
Publication StatusPublished
<mark>Original language</mark>English

Abstract

This paper reports the first ATLAS measurement of the Bs0→ μμ effective lifetime. The measurement is based on the data collected in 2015–2016, amounting to 26.3 fb−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 Bs0 effective lifetime, with statistical uncertainties extracted through a Neyman construction. The resulting effective measurement of the Bs0→ μμ lifetime is 0.99−0.07+0.42 (stat.) ± 0.17 (syst.) ps and it is found to be consistent with the Standard Model.