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T: Fachverband Teilchenphysik

T 27: Suche nach Physik jenseits des Standardmodels II

T 27.8: Vortrag

Dienstag, 20. März 2018, 18:15–18:30, Philo-HS4

Track Reconstruction Performance for Semi-stable Charged Particles at CMS — Samuel Bein, Viktor Kutzner, Peter Schleper, Georg Steinbrueck, •Alexandra Tews, and Benedikt Vormwald — Institut für Experimentalphysik, Universität Hamburg

A variety of extensions of the standard model predict charged particles with lifetimes of the order of nanoseconds, allowing them to leave short tracks inside the tracking system of a particle detector before decaying.
Studies on the track reconstruction performance are a crucial part of analyses with such semi-stable charged particles at CMS.
Key parameters assessing the tracking performance are the efficiency of the tracking algorithm to find and reconstruct such tracks, as well as the probability that a given track is a "fake", and thus does not correspond to one single true particle. The tracking efficiency is associated with important systematic uncertainties while the fake rate is important for estimating the background in such searches.
A study on the track reconstruction performance is done using proton-proton collision data collected with the CMS experiment at √s = 13 TeV making use of both, real and simulated data, with the particularity that a data-driven method is employed to measure the tracking efficiency.