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Journal Article

Measurement of the $B_s^0 \to μμ$ Effective Lifetime with the ATLAS Detector


ATLAS Collaboration, 
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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ATLAS Collaboration (2023). Measurement of the $B_s^0 \to μμ$ Effective Lifetime with the ATLAS Detector. Journal of High Energy Physics, 09, 199. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2023-159.

Cite as: https://hdl.handle.net/21.11116/0000-000F-113C-B
This paper reports the first ATLAS measurement of the $B_s^0 \to \mu\mu$ 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 $58\pm13$ background-subtracted signal candidates is fit with simulated signal templates parameterised as a function of the $B_s^0$ effective lifetime, with statistical uncertainties extracted through a Neyman construction. The resulting effective measurement of the $B_s^0 \to \mu\mu$ lifetime is $0.99^{+0.42}_{-0.07} \, (\text{stat.})\pm 0.17 \text{ (syst.)}\,\mathrm{ps}$ and it is found to be consistent with the Standard Model.