Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 27: Suche nach Physik jenseits des Standardmodels II

T 27.7: Talk

Tuesday, March 20, 2018, 18:00–18:15, Philo-HS4

Analysis of changes in the ATLAS reconstruction algorithm for slow, muon-like particles — •Martin Habedank and Sascha Mehlhase — Ludwig-Maximilians Universität München

Many extensions of the Standard Model (SM) predict heavy, long-lived charged particles in reach of the LHC. These are called stable massive particles (SMPs) if they traverse large parts of the detector before decaying. Due to their long lifetime and little interaction with the calorimeters, they would leave tracks comparable to that of a muon in the ATLAS particle detector. In contrast to Standard Model muons, a velocity significantly lower than the speed of light is expected for SMPs. Their velocity β can be reconstructed by dE/dx and time-of-flight measurements and grants therefore a model-independent approach for the search for beyond the Standard Model (BSM) particles.

In the last few years, there has been a complete revision of the ATLAS reconstruction algorithm for these slow, muon-like particles. The changes in this revision are analysed, differences and similarities regarding reconstruction techniques and efficiencies in dependence of the various particle kinematics are pointed out and the impact for the search for SMPs is evaluated.