Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 85: Experimentelle Methoden III
T 85.5: Vortrag
Donnerstag, 22. März 2018, 17:35–17:50, Z6 - SR 1.013
Measurement of the ATLAS muon reconstruction efficiency on 2016 data using Z→µµ events — Johannes Junggeburth1, •Nicolas Köhler1, Hubert Kroha1, and Max Goblirsch-Kolb2 — 1Max-Planck-Institut für Physik — 2Brandeis University
The precise knowledge of the muon reconstruction efficiency is an important ingredient for all data analyses at the LHC with muons in the final state. A tag&probe method has been used in Z→µµ events to determine the muon reconstruction efficiency from data. By applying the same procedure to Monte Carlo Z→µµ events, an efficiency scale-factor used to correct the the Monte Carlo data is evaluated. Because of the large data set collected in Run-2 at 13 TeV center-of-mass energy, systematic uncertainties in the scale-factor measurement have become a significant source of uncertainty for the ATLAS data analyses. In this talk, the muon reconstruction efficiencies determined for the years of 2015-2017 are discussed as well as a new method for reducing the systematic uncertainties on the measurement by about one order of magnitude.