Abstract
This work shows the performance in the muon momentum scale and resolution achieved by ATLAS during the 2012 run at s=8. The momentum scale is known with an uncertainty ranging from 0.05% (in the central rapidity region) to 0.2% (at large rapidities). The muon momentum resolution is measured to be 1.7% for central muons with low momentum (pT≃10 GeV) and reaches 4% for high-pT muons in the forward regions of the ATLAS detector.
Highlights
Muons are used in a very wide range of measurements by the ATLAS experiment [1] and the knowledge of their momenta is a fundamental ingredient to physics analyses
The ATLAS simulation includes the best knowledge of the detector geometry, material budget and modelling of muon interactions available at the time of its production and needs additional corrections in order to reproduce the muon momentum scale and resolution observed in data
The meaning of the different parameters appearing in the empirical parametrisation of Eq.1 is the following: s0 - This parameter accounts for energy loss in the calorimeter and in other materials. s0ID= 0 since the energy loss between the interaction vertex and the Inner Detector (ID) is negligible
Summary
Muons are used in a very wide range of measurements by the ATLAS experiment [1] and the knowledge of their momenta is a fundamental ingredient to physics analyses. The Inner Detector reconstructs the tracks associated to charged particles by combining highresolution detectors at inner radii with continuous tracking at outer radii. It is contained in a solenoidal magnetic field of 2 T and its acceptance is |η| < 2.5. This type is especially useful to recover acceptance for muons which fall in MS regions with smaller acceptance or that traverse less chambers due to their low momentum
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