Jonas Neundorf

Doctoral candidate

Deutsches Elektronen-Synchrotron DESY
Notkestrasse 85
22607 Hamburg



Doctoral Project

Search for Heavy Majorana Neutrinos
The neutrino is an elementary particle that is predicted to be massless in the Standard Model.
However, recent measurements have shown that neutrinos do have a mass.
It is very tiny, but larger than zero, which indicates the existence of some sort of new physics Beyond the Standard Model (BSM).
There are many theories (often called models) that try to explain this.
During the first year of my PhD, I investigated the sensitivity of the Large Hadron Collider (LHC) to two such models in a final state that has not yet been investigated at the LHC.
These studies showed that this final state offers sensitivity to unexplored parts of the parameter space of these models.
The main project of my PhD is to search for these models with the ATLAS experiment at the LHC.

Commissioning of the Endcap Coldbox Prototype
From 2025 onwards, the ATLAS experiment will receive a completely new tracking system called "Inner Tracker" (ITk).
The sensor modules of the new detector will undergo various quality control tests to ensure that they will perform well even under the extreme conditions inside the detector.
As part of these tests, the modules will undergo thermal cycling between -35 °C and +40 °C in a setup developed at DESY.
My contribution here is the commissioning of the prototype setup, especially testing the thermal performance.



Fuks et al.: Majorana neutrinos in same-sign W±W± scattering at the LHC: Breaking the TeV barrier. Phys. Rev. D. 103 (2021) 5, 055005, DOI: 10.1103/PhysRevD.103.055005

Fuks et al.: Probing the Weinberg Operator at Colliders. Phys. Rev. D. 103 (2021) 11, 115014, DOI: 10.1103/PhysRevD.103.115014