Elementary Particle Physics
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Master Theses Topics in Experimental Particle Physics

In our group we offer a broad spectrum of master thesis topics in experimental elementary particle physics.

Overview

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General Contacts

If you have questions of organisational nature, or if you would like to have some advice which master thesis topic would be most suitable for you please contact

Prof. Dr. Otmar Biebel

If you have already spotted your favorite topic or you have questions concerning a specific topic you can also address directly the contact person indicated for each topic.

Measurement of the Higgs self interaction

We have started investigations to measure the self interaction of the Higgs boson. This will provide the parameter λ of the Higgs potential. The shape of the Higgs potential is just the simplest conceivable choice which allows for a consistent theoretical treatment. However, deviations from it may be possible due to extensions of the standard model which are required for example in view of the metastability of the electroweak vacuum. So an experimental measurement of the value of λ is due.

The cross section of the Higgs self interaction process is tiny. Many competing processes provide final states which look very similar to a Higgs self interaction final state. Thus we investigate machine learning concept in general and neural networks in particular to separate the competing processes from the searched for Higgs self interaction.

Contact
Prof. Dr. Otmar Biebel

Detector R&D and Particle Identification

 

SGR_principle    cherenkov_mm_principle

   Segmented GEM Readout detector (schematic)              Inverse RICH-Micromegas detector (working principle)

          gem_with_converterlayers               mdt_ro_upgrade

              Triple-GEM for photon detection                        New RO electronic for the ATLAS phase II (s)MDT upgrade1

The extreme radiation background conditions at LHC require the development of new and radiation hard particle detectors which shall replace existing and less radiation tolerant detector technologies in the ATLAS detector. Furthermore an upgrade of the readout electronics of the ATLAS muon spectrometer for handling the increased luminosity of the HL-LHC is ongoing with a major contribution from our working group.

Our research is focused on

  • Micro pattern gaseous particle detectors like MICROmesh GAseous Structures (Micromegas) or Gaseous Electron Multiplier (GEM); such detectors shall have a spatial resolution of 20 to 100 micron. Selected, current research projects are
    • Segmented GEM Readout (SGR) detector
    • Charge sharing microstructured detectors with pixel-like resolution but very few readout channels
    • XYUV triple-GEM detectors for high-rate multi-particle resolution (up to 1 GHz/cm2)
    • Development of reconstruction algorithms for improving the spatial resolution
    • Detailed simulations of microstructured detectors using FEM calculations plus particle tracking
    • Long-term irradiation and performance studies of ATLAS NSW Micromegas detectors
  • Readout electronics testing and integration for the Phase II upgrade of the ATLAS muon spectrometer in our Cosmic Ray Facility.

Topics for master theses are directly connected to these areas of detector research & development. A thesis involves both hardware and software related work. This includes typically the conceptual planning of an experiment, setting-up the experimental apparatus, performing the measurements and, finally, analysing and interpreting the results from the measurement.

Contact
Prof. Dr. Otmar Biebel

 

1https://cds.cern.ch/record/2770861/files/ATL-MUON-SLIDE-2021-175.pdf