Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 27: Suche nach Physik jenseits des Standardmodels II

T 27.6: Talk

Tuesday, March 20, 2018, 17:45–18:00, Philo-HS4

Search for heavy charged long-lived particles with the ATLAS detector in a dataset of 36.1 fb⁻¹ p-p collisions — •Michael Adersberger and Sascha Mehlhase — LMU, Munich, Germany

Heavy charged long-lived particles are an important target for searches at the LHC, as they are predicted in a large variety of theories beyond the Standard Model. A model-independent approach will be presented, where heavy charged long-lived particles are detector stable or reach at least the ATLAS hadronic calorimeters, from now on referred to as Stable Massive Particles (SMP).
The main observables to identify SMPs are time-of-flight and specific ionisation energy-loss measurements. Their velocity is significantly lower then the speed-of-light due to their high mass and the moderate kinetic energies available. They are expected to have a significantly higher specific ionisation energy-loss than Standard Model particles produced at the LHC. The main backgrounds are of instrumental nature and due to mis-measurements of various observables.
This search targets Chargino and Stau SMP models with two charged tracks in the final state and R-hadron SMP models (gluino, sbottom, stop) which have a significant fraction uncharged tracks after hadronisation or undergo a change of charge due to hadronic interactions with the detector material. Most recent public results will be presented.