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

TL;DR

This paper presents the first measurement of the $B_s^0 o \mu\mu$ effective lifetime using ATLAS data from 2015-2016, providing results consistent with the Standard Model and employing a novel decay-time distribution analysis.

Contribution

First ATLAS measurement of the $B_s^0 o \mu\mu$ effective lifetime based on 26.3 fb$^{-1}$ of 13 TeV data, using a decay-time distribution fit with simulated templates.

Findings

Effective lifetime measured as 0.99^{+0.42}_{-0.07} (stat.) b1 0.17 (syst.) ps.

Result consistent with Standard Model predictions.

Analysis based on 58 signal candidates with background subtraction.

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 $58\pm13$ 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.