Measurement of the Z boson cross-section in - Harvard University ...

Chapter 4: Data Collection and Event Reconstruction 125
combining the measurements from the two systems. Tagged muons are inner detector
tracks that have been extrapolated into the muon spectrometer and associated with
track segments in the spectrometer. Calorimeter tagged muons are inner detector
tracks that have been associated with calorimeter energy deposits consistent with a
muon.
There are two independent algorithms for muon track reconstruction, resulting in
two collections of muon tracks as the reconstruction output. The families are named
after the corresponding standalone reconstruction algorithms: Moore and Muonboy.
In the following section, we describe the concept and implementation of the Moore
algorithm in detail. The Muonboy algorithm, which is conceptually similar to Moore
but differs from it in particular aspects of implementation, is described in brief.
Standalone muon reconstruction
In standalone muon reconstruction, track segments are built using hits in the
various measurement technologies (see Chapter 2), and then the segments are linked
to form tracks.
Reconstruction by Moore
Muon track reconstruction by Moore (Muon Object-Oriented REconstruction) [6]
proceeds in three distinct steps:
• pattern recognition
• segment building
• track finding and fitting