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

Abstract

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 $58\pm 13$ 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 $B_s^0\to \mu \mu$ lifetime is $0.99_{-0.07}^{+0.42}(\text{stat.})\pm 0.17\text{ (syst.)}\mathrm{ps}$ and it is found to be consistent with the Standard Model.

32 pages in total, author list starting page 14, 4 figures and 1 table. All figures/tables (including auxiliary ones), are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2020-07/

References in corpus (2)

• sPlot: a statistical tool to unfold data distributions
• Probing New Physics via the $B_s^0\to {\mu }^{+}{\mu }^{-}$ Effective Lifetime

Cited by in corpus (1)

• Electroweak, QCD and flavour physics studies with ATLAS data from Run 2 of the LHC