Measurement of the Bs0→ μμ effective lifetime with the ATLAS detector.

Authors :: Aad, G.
Abbott, B.
Abeling, K.
Abicht, N. J.
Abidi, S. H.
Aboulhorma, A.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Acharya, B. S.
Adam Bourdarios, C.
Adamczyk, L.
Addepalli, S. V.
Addison, M. J.
Adelman, J.
Adiguzel, A.
Adye, T.
Affolder, A. A.
Afik, Y.
Agaras, M. N.
Source :: Journal of High Energy Physics. Sep2023, Vol. 2023 Issue 9, p1-32. 32p.
Publication Year :: 2023
Abstract: This paper reports the first ATLAS measurement of the B s 0 → 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 B s 0 effective lifetime, with statistical uncertainties extracted through a Neyman construction. The resulting effective measurement of the B s 0 → 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. [ABSTRACT FROM AUTHOR]