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Reference : UMR7164-GIOMAR-003
Workplace : PARIS 13
Date of publication : Thursday, October 14, 2021
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 January 2022
Proportion of work : Full time
Remuneration : Between 2700 and 3900 € gross monthly according to experience
Desired level of education : PhD
Experience required : Indifferent
After the discovery of the Higgs boson in the LHC Run1 and the precise measurement of its couplings to other particles in Run2, measuring its self-coupling is now one of the main objectives of the Higgs physics program of the ATLAS experiment. The candidate will work on the preparation and analysis of the Run3 data to constrain the self-coupling of the Higgs boson.
If the self-coupling of the Higgs boson is as predicted by the Standard Model, a very large sample of di-Higgs boson events produced in the high luminosity phase of the LHC will be needed to measure it. This requires an updated charged particle detector, currently under construction, and dedicated reconstruction and simulation software, which is also under development. The candidate will also contribute to these construction and development activities.
The selected candidate will work on two axes:
• data analysis: the candidate will prepare and perform the analysis of the first data from the LHC Run3, focusing on the study of the production of a pair of Higgs bosons in the final states with two b-jets and two photons, including performance work on the reconstruction and identification of b-jets or photons to improve the sensitivity of the current analyses.
• detector: the candidate will work on the reconstruction and simulation software of the ITk detector for the high luminosity phase of the LHC.
The work will be carried out with all the other members of the ATLAS APC team, and in collaboration with other laboratories of CNRS/IN2P3 and of the ATLAS Collaboration.
Applicants must have a doctorate in physics, with a thesis in experimental high energy physics. Experience in data analysis (programming and numerical methods, machine learning, ROOT / RooFit) and / or in the development (hardware or software) of detectors for particle physics experiments (trackers in particular) are also required.
Candidates must also demonstrate an ability to work in a team and to integrate into a multidisciplinary scientific community, in particular by communicating about their work to their peers while respecting the rigor and ethical requirements inherent in any scientific project. Any concrete evidence of such capabilities, for example in the form of publications in a peer-reviewed journal or presentation in a conference, will therefore be highly appreciated.
Finally, English being the main working language of the project and the associated international physics experiences, a good written and oral command of this language will be required.
The AstroParticles and Cosmology Laboratory (APC) in Paris is a Joint Research Unit (UMR) created in 2005. The APC brings together around 75 permanent researchers, and around fifty engineers, technicians and administrative staff. Including non-permanent staff (doctoral students, postdoctoral fellows, foreign visitors), some 200 people form this structure, managed by Université de Paris (UP), by the CNRS (represented by three of its Institutes: mainly the IN2P3, but also the INSU and the INP), and also by the CEA (DSM / IRFU), the Paris Observatory, and the CNES.
The laboratory is centered around four main themes: cosmology, gravitation, high energy astrophysics, particle physics. In addition to the experimental or observational activities described above, the themes covered by the laboratory are studied by the Theory group.
The ATLAS group at the APC was created in March 2021 and is part of the particle physics theme of the laboratory. The group is currently composed of three members of the research staff (Gregorio Bernardi, Marco Bomben, Giovanni Marchiori) who have been members of the ATLAS collaboration for more than a decade, and two doctoral students. Three other doctoral students are joining the group in the fall of 2021. The group has made a strong contribution to ATLAS physics analyses and has a long-standing experience in the design, construction and commissioning of detectors. In particular, the group is extensively involved in the study of the properties of the Higgs boson in di-photon end states or b-quark pairs, with prominent roles in both axes and is very active in studies of performance and R&D of current (ID) and future (ITk) silicon pixel ATLAS sub-detectors. We also contribute to the Higgs Boson physics case studies of future Higgs factory experiments such as the “future circular collider”.
Constraints and risks
This project does not present any particular occupational risks. On the other hand, due to the international nature of the collaborations, short trips abroad (subject to improvement of sanitary conditions) are to be expected.
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