Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 98: Experimentelle Methoden III

T 98.1: Gruppenbericht

Donnerstag, 3. März 2016, 16:45–17:05, VMP8 SR 105

Track reconstruction for the Mu3e experiment — •Alexandr Kozlinskiy for the Mu3e collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Germany

The Mu3e experiment is designed to search for the lepton flavour violating decay µ⁺ → e⁺e⁻e⁺. To reach the sensitivity of 10⁻¹⁶, the experiment will be performed at a beam line at the Paul-Scherrer Institute (Switzerland) providing 10⁹ muons per second. The muons with a momentum of about 28 MeV/c are stopped on a target and decay at rest. The target is placed inside two double layers of 50 µm thin pixel sensors with a pixel size of 80×80 µm². Timing information is provided by three layers of scintillating fibres, placed just before the outer double layers, and a scintillating tile detector. To improve momentum resolution, the detector geometry allows to record additional hits when particles bend back in the 1 T magnetic field. A fast track reconstruction is needed to cope with the high occupancy environment, reaching 100 tracks per readout frame of 50 ns. The implementation of a track reconstruction with a fast multiple scattering fit, where spatial uncertainties are ignored, is described. The performance of the track reconstruction and the use of timing information from fibre and tile detector is presented.