Abstract
A dedicated reconstruction algorithm to find decay vertices in the ATLAS muon spectrometer is presented. The algorithm searches the region just upstream of or inside the muon spectrometer volume for multi-particle vertices that originate from the decay of particles with long decay paths. The performance of the algorithm is evaluated using both a sample of simulated Higgs boson events, in which the Higgs boson decays to long-lived neutral particles that in turn decay to bb̄ final states, and pp collision data at √s = 7 TeV collected with the ATLAS detector at the LHC during 2011.
Highlights
Muon spectrometerATLAS is a multi-purpose detector [1], consisting of an inner tracking system (ID), electromagnetic and hadronic calorimeters and a muon spectrometer
A dedicated reconstruction algorithm to find decay vertices in the ATLAS muon spectrometer is presented
The precision tracking measurements are provided by monitored drift tube (MDT) chambers throughout the MS and cathode strip chambers (CSCs) in the innermost layer of the endcaps
Summary
ATLAS is a multi-purpose detector [1], consisting of an inner tracking system (ID), electromagnetic and hadronic calorimeters and a muon spectrometer. The MS, the outermost part of the detector, is designed to measure the momentum of charged particles escaping the calorimeter in the region |η| ≤ 2.7 and provide trigger information for |η| ≤ 2.4. It consists of one barrel and two endcaps, shown, that have fast detectors for triggering and precision chambers for track reconstruction. The two endcap toroids, each with eight superconducting coils, are inserted in the barrel at each end They have a length of 5.0 m, an inner bore of 1.65 m and an outer diameter of 10.7 m. The MS uses “air core” toroid magnets to minimize the amount of material traversed by particles, a non-negligible amount of material is present in the form of support structures, magnet coils and muon chambers
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