title: Pixel Sensor Evaluation and Track Fitting for the Mu3e Experiment
creator: Kiehn, Moritz Simon Maria
subject: 530
subject: 530 Physics
description: Mu3e is a proposed new experiment that searches for the lepton flavour changing muon decay µ⁺ → e⁺e⁻e⁺ with a projected sensitivity of 1 in 10¹⁶ decays. This decay is extremely suppressed in the Standard Model and an observation would be a clear sign of new physics. The muons are stopped on a target and decay electrons are measured in a magnetic spectrometer with a pixel detector. A low material budget and special algorithms are required to reconstruct the low momentum, strongly curved tracks with high precision at high rates.    In this work, I present the first systematic performance evaluation of the Mu3e high voltage monolithic active pixel sensor prototypes using test beam measurements at DESY. I showed that this novel technology allows sensor efficiencies above 99%.    In addition, I characterized a new track fit based on hit triplets. This fast fit is optimized to reconstruct multiple scattering dominated tracks and is suitable for Mu3e online tracking. For a precise offline reconstruction, I adapted the advanced general broken lines fit. It allows an increase in momentum resolution of up to 20% compared to the best fast algorithm.    The systematic pixel sensor and track fit evaluation with the corresponding software development is a cornerstone for Mu3e tracking.
date: 2016
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/20493/1/dissertation-kiehn-v4-pdfa.pdf
identifier: DOI:10.11588/heidok.00020493
identifier: urn:nbn:de:bsz:16-heidok-204936
identifier:   Kiehn, Moritz Simon Maria  (2016) Pixel Sensor Evaluation and Track Fitting for the Mu3e Experiment.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/20493/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng