Fig. 1: The ATLAS muon spectrometer. |
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Fig. 2: ATLAS muon spectrometer integrated magnetic field strength as a function of ![]() |
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Fig. 3: Number of detector stations traversed by muons passing through the muon spectrometeras a function of ![]() ![]() |
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Fig. 4: Contributions to the momentum resolution for muons reconstructed in the Muon Spectrometer as a function of transverse momentum for ![]() ![]() |
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Fig. 5: True ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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Fig. 6: Standalone efficiency and fake rate as functions of true ![]() ![]() ![]() ![]() |
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Fig. 7: Standalone fractional momentum resolution (![]() ![]() ![]() ![]() ![]() |
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Fig. 8: Inner detector ![]() ![]() ![]() ![]() |
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Fig. 9: Combined muon efficiency and fake rate for Staco (left) and Muid (right) as functions of true ![]() ![]() ![]() ![]() ![]() |
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Fig. 10: Distributions of ![]() ![]() ![]() ![]() |
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Fig. 11: Combined muon fractional momentum resolution (![]() ![]() ![]() ![]() ![]() ![]() |
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Fig. 12: MuGirl efficiency (left) and fake rates (right) as a function of
true ![]() ![]() ![]() ![]() |
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Fig. 13: MuGirl fractional momentum resolution (![]() ![]() ![]() |
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Fig. 14: Muon efficiencies and fake rates for Staco+Atlas.MuTag (left) and
Muid+Atlas.MuGirl (right) as functions of true ![]() ![]() ![]() ![]() ![]() |
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Fig. 15: Low-![]() ![]() ![]() ![]() |
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Fig. 1: Material distribution before the muon spectrometer in ATLAS as a function of ![]() ![]() |
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Fig. 2: Left: 3-D view of the tracking geometry up to the muon spectrometer. Right: Example set of energy loss update layers (shown as additional surfaces with respect to the figure on the left; update positions shown as squares) created during the extrapolation of a track (black line) through the calorimeter.
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Fig. 3: Calculated difference between the calorimeter entrance and exit coordinates (![]() ![]() ![]() ![]() |
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Fig. 4: Distribution of the energy loss of muons passing through the calorimeters (![]() |
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Fig. 5: Parameterization of the ![]() ![]() ![]() |
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Fig. 6: Left: Fit to the most probable value and width of the Landau distribution as a
function of thickness of iron for muons of momentum 200 GeV. The fitting function has the form ![]() ![]() ![]() |
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Fig. 7: Most probable value of the energy loss as parameterized in the geometry of the ATLAS tracking (points) and in GEANT4 for muons of momentum 10 GeV (left) and 1 TeV (right) as a function of pseudorapidity. The solid line and points correspond to the energy loss of muons propagating from the beam pipe to the exit of the hadronic calorimeters. The filled histogram and hollow points correspond to the energy loss of muons propagating from the beam pipe to the entrance of the hadronic calorimeters.
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Fig. 8: Distribution of the muon energy deposited in one electromagnetic calorimeter cell by 15 GeV muons, fitted to a Landau function convolved with a gaussian. The gaussians on the left of each plot are the distributions of the noise. Left (right): energy deposit in a cell belonging to the first (middle) longitudinal sampling traversed by the muon. The energy is the sum of the energies of the (up to two) cells belonging to the muon cluster. The data were collected in the 2004 Combined Test Beam.
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Fig. 9: Example of the isolated muon signal as measured at ![]() |
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Fig. 10: Illustration of the Straight Line (left) and Track Update (right) concepts.
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Fig. 11: Comparison between the average measured transverse energy deposition (points) and true
energy lost between the beam-pipe and the muon spectrometer (line) for muons of momentum 10 GeV
(left), 100 GeV (center) and 300 GeV (right). The errors shown are statistical only.
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Fig. 12: Distribution of the isolation energy in the electromagnetic (![]() ![]() ![]() |
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Fig. 13: Distribution of the number of inner detector tracks (including the muon track) with ![]() ![]() |
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Fig. 14: Rejection of the ![]() ![]() ![]() ![]() |
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Fig. 15: Ratio of the energy loss resolution for the Hybrid Method with respect to the parameterization alone for single muons.
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Fig. 16: Rejection of the ![]() ![]() ![]() ![]() |
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Fig. 17: Left: Muon reconstruction bias for different algorithms as a function of muon ![]() ![]() |
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Fig. 18: Left: Reconstruction resolution of the $Z$ peak for different algorithms. Right: Reconstruction resolution of the ![]() ![]() |
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Fig. 19: Left: Reconstruction resolution of the ![]() ![]() ![]() |
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Fig. 20: Energy found in the cell traversed by the extrapolated track (solid line) and the surrounding cells (dashed line) in the TileCal (left) and in the HEC (right). Distributions obtained for momentum 100 GeV muons.
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Fig. 21: Efficiency (and fakes per event, right axis in red and shaded histograms) vs ![]() ![]() ![]() ![]() ![]() |
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Fig. 22: Reconstructed Higgs peak in the ![]() ![]() |
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Fig. 23: Reconstructed ![]() ![]() ![]() |
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Fig. 1: Sketch of a quadrant of the ATLAS muon spectrometer.
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Fig. 2: Distribution of the distance ![]() |
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Fig. 3: Illustration of the iterative fit of normal distributions to the fractional deviation of the reconstructed inverse momentum from the generated inverse momentum. ![]() ![]() |
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Fig. 4: Efficiencies of the reconstruction of tracks in the muon spectrometer.
(a) Reconstruction efficiency vs. and for muons of ![]() ![]() ![]() ![]() ![]() |
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Fig. 5: Stand-alone momentum resolution integrated over and as a function of ![]() |
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Fig. 6: Comparison of reconstruction efficiency for an aligned muon spectrometer and a misaligned muon spectrometer with a average positioning uncertainty of 1 mm for a simulated single muon sample.
(a) Efficiency vs. ![]() ![]() ![]() ![]() ![]() |
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Fig. 7: Comparison of the fractional ![]() ![]() ![]() ![]() |
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Fig. 8: Reconstructed Z boson mass distribution for an aligned and a misaligned muon spectrometer layout (misalignment ![]() |
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Fig. 9: Width of the Z resonance peak including the natural width of the Z vs. misalignment parameter ![]() |
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Fig. 10: Schematic illustration of the tag and probe method.
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Fig. 11: : Reconstructed quantities for Z candidate events only using inner detector tracks with a transverse momentum above 6 GeV and no further cuts for signal and background processes.
(a) Invariant mass of Z candidates.
(b) Transverse momentum distribution.
(c) Number of reconstructed tracks within a cone of ![]() ![]() |
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Fig. 12: Cut-flow diagram for probe muon tracks: (0) opposite charge requirement, (1) invariant mass requirement, (2) kinematic cuts, (3) isolation requirements, (4) electron veto, (5) found at least one track in the muon spectrometer.
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Fig. 13: Illustration of the choosen ![]() ![]() |
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Fig. 14: Comparison of the muon reconstruction efficiency of the muon spectrometer vs.![]() ![]() |
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Fig. 15: Distribution of muon reconstruction efficiency of the 320 muon spectrometer regions.
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Fig. 16: Average statistical error of reconstruction efficiency of the 320 regions vs. integrated luminosity.
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Fig. 17: Reconstruction efficiency of the muon spectrometer for muon tracks which have been triggered and muon tracks which have not been triggered.
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Fig. 18: Comparison of muon reconstruction efficiencies determined via tag and probe approach for two sets of muons differing by ![]() |
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Fig. 19: Expected invariant masses ![]() |
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Fig. 20: Dependence of ![]() ![]() ![]() ![]() ![]() |
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