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Reference : UMR9012-SLADRA1-002
Workplace : ORSAY
Date of publication : Thursday, March 19, 2020
Scientific Responsible name : Asmaa ABADA
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2020
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
“Synergy and complementarity of high energy and high intensity searches”: Explore collider searches of neutrino mass models, LNV versus LFV scales, leptogenesis
In this research project, the Ph.D. student will address the problem of the potential existence of extra neutral fermions, and their impact for particle physics and cosmology.
The student will start by building the most minimal models, which offer a viable framework for neutrino mass generation, successfully accommodating all observations and current constraints. Within these minimal frameworks, some questions concerning the nature of the neutrinos and their mass ordering are of great importance as they can have an impact not only regarding particle physics but for cosmology as well (baryon asymmetry via leptogenesis, dark matter abundance). Another important point is related with the CP-violating phases associated with the leptonic mixing, which should be addressed from the phenomenological point of view, especially in what concerns low-energy observables sensitive to their presence and nature. In his/her work, the Ph.D. student will address the impact of these SM extensions via sterile fermions for several observables presently searched for in high-intensity experiments (LHCb, Belle 2, lepton flavour dedicated), also exploring any potential direct signal at colliders (present and future). At the same time the student will also carry out studies on the implications of these minimal models for cosmology, in particular the prospects for leptogenesis at low-scales.
These minimal frameworks could be embedded into complete SM extensions (still allowed by the LHC), and same lines of research should be conducted.
Concerning the methodology, an important part of the thesis work will be devoted to the effective approach that is independent from the new physics model. The student will explore the potential role of the operators of higher dimension in the flavour violating processes as well as the effects due to the violation of unitarity in the leptonic mixing matrix.
the project is dedicated to theoretical and phenomenological studies in particle physics, to be carried at the Theory Department of the IJCLAB (Laboratoire de physique des 2 infinis - Irène Joliot-Curie).
Constraints and risks
None foreseen, and the student will only conduct theoretical work.
During the thesis, the Ph.D. student is expected to carry several secondments in Laboratories and Research Institutes, as well as in industrial enterprises and media centres (two months at the Universidad Autonoma de Madrid, one month at CERN, 2 weeks at ORANO and two weeks in “El Pais”). The Ph.D. student will actively participate in doctoral schools and workshops organised by the project's network; in addition he/she will also attend at least one international school and one international conference/workshop per year (in average).
Source of funding: H2020-MSCA-ITN-2019, project “HIDDeN”, Proposal number: 860881
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