Münster 2017 – scientific programme
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T: Fachverband Teilchenphysik
T 116: Detektorsysteme 4
T 116.1: Group Report
Thursday, March 30, 2017, 16:45–17:05, VSH 17
Track reconstruction for the Mu3e experiment — •Alexandr Kozlinskiy — Kernphysik Institut, Johannes Gutenberg-Universität Mainz
The Mu3e experiment is designed to search for the lepton flavour violating decay µ+ → e+e−e+. To reach phase I sensitivity of 5·10−15, the experiment will be performed at the πE5 beam line at the Paul-Scherrer Institute (Switzerland) providing 108 muons per second. The muons with a momentum of about 28 MeV/c are stopped and decay at rest on a target that is placed inside two double layers of 50 µ m thin pixel sensors with a pixel size of 80×80 µ m2. 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 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 reconstruction frame of 50 ns. The track reconstruction uses a novel fit algorithm that only takes into account the multiple scattering uncertainty and neglects detector resolution, allowing fast online reconstruction on a graphics processor (GPU) based filter farm. The implementation and performance of offline track reconstruction and the use of timing information from fibre and tile detector are presented.