Applications are invited for a post-doctoral position in the ATLAS group at the Center for Particle Physics of Marseille (CPPM), France. The successful candidate is expected to work on the development of Artificial Intelligence (AI) algorithms applied to hardware processing units based on FPGAs for the phase II upgrade of the ATLAS detector.

CPPM is involved in several major projects in experimental particle physics, astroparticle, cosmology and interdisciplinary applications. The ATLAS group at CPPM gathers about forty-five people, including fifteen staff physicists and ten PhD students. The group played a major role in the design and construction of the electromagnetic end-cap calorimeters, the pixel detector and the trigger system, and pursues a strong R&D effort for planned future upgrades of the detector, notably for the Liquid Argon (LAr) calorimeter, as well as a key contribution to physics analysis in ATLAS.

The successful candidate is expected to take a leading role in the development of data processing algorithms allowing to efficiently compute the energies deposited in the LAr calorimeters in the high pileup conditions expected at the HL-LHC. These algorithms will be based on AI techniques such as recurrent neural networks and will be adapted to fit on hardware processing units based on high-end FPGA. The successful candidate will be responsible of designing the AI algorithms and assessing their performance. The candidate will also assess the effect of employing such algorithms for electromagnetic object reconstruction (especially at trigger level) and for benchmark physics analyses. She/he will work closely with the engineers designing the electronic cards at CPPM in order to adapt the AI algorithm to the specifics of FPGAs. Candidates with a strong interest for hardware will be encouraged to take part in the design of the firmware to program the FPGAs.

The position is for a fixed term of three years, and is based in Marseille, with frequent trips to Geneva. The starting date for the position is beginning 2021. Candidates should have a PhD in experimental particle physics by the date of appointment. Good communication skills are expected.

Candidates are invited to send their complete application package (CV, cover letter and statement of research interests, list of publications) to aad@cern.ch and monnier@in2p3.fr, and to arrange for three letters of recommendation to be sent directly to the same addresses. The review of applications will start in December 2020 and will continue until the position is filled. Applications received by 31st of December 2020 will receive full consideration.

Further inquiries about the CPPM ATLAS group and the position should be addressed to Georges Aad (aad@cern.ch) and Emmanuel Monnier (monnier@in2p3.fr).

General informations : workplace: Orsay and Marseille Type of contract : CDD contract Contract Period : 3 years Expected date of employment : between May 1st 2021 and September 1st 2021 Remuneration : Between 2606 and 3615 € monthly gross, according to work experience. Desired level of education : PhD Deadline for application : April 16th 2021

Missions : Being forbidden in the Standard Model (SM) of particle physics, lepton flavor violating decays are among the most powerful probes to search for physics beyond the SM. In view of the recent anomalies seen by LHCb and B-factories on tests of lepton flavor universality in b $\rightarrow$ s and b $\rightarrow$ c processes, the interest of B to tau decays has been greatly reinforced. In particular, several new physics models predict branching fractions that could be observed at Belle II for channels such as $B\rightarrow (X)\tau\mu$ decays, where X is a hadron. Thanks to the high statistics that will be collected and new B-tagging algorithm currently being developed at IJCLab, the Belle II experiment provides an ideal environment to study rare decays of B into tau leptons. The mission of this post doc will be to analyze the Belle II data in order to obtain the best experimental limits on lepton flavor violating $B\rightarrow (X)\tau\mu$ decays. The B-tagging algorithms can be beforehand validated on Belle data. Other decays such as $B\rightarrow (X)\tau\tau$ can also be studied. A participation to trigger and/or tracking activities is foreseen as a service task.

Activities: Data analysis, participation to data taking, participation to Belle II service tasks, activities of outreach and dissemination, students supervision. Work context: The successful candidate will be based in a first period of 18 months at IJCLab (Orsay, https://www.ijclab.in2p3.fr/ ) and then at CPPM, Marseille (http://cppm.in2p3.fr). The fundings for this post doctoral come from an ERC grant obtained by Justine Serrano

Skills
- Ph.D. in Experimental Particle Physics
- Excellent analysis and software skills (python, ROOT, C++), teamwork abilities and knowledge of English
- Experience in Belle II data analysis is appreciated but not mandatory

Additionnal informations Interested physicists are invited to submit their application, including a cover motivation, curriculum vitae, list of publications and copies of university degrees. They should also arrange for three letters of recommendation. For more information, Justine Serrano (serrano@cppm.in2p3.fr) or Karim Trabelsi (karim.trabelsi@in2p3.fr).

References: https://arxiv.org/abs/1808.10567 https://arxiv.org/abs/1903.11517 https://arxiv.org/pdf/1806.05689

The Centre de Physique des Particules de Marseille (CPPM) invites applications for a two-year postdoctoral research position in cosmology. The position is dedicated to research related to the Dark Energy Spectroscopy Instrument (DESI) survey. The CPPM cosmology team is involved in future experiments such as DESI, Euclid, Vera Rubin/LSST, and the LISA experiment.

DESI is a ground-based experiment at the Kitt Peak National Observatory Mayall 4m telescope. Starting observations in 2021, DESI will conduct a five-year survey designed to cover 14,000 deg2 and to map the large-scale structure of the Universe by measuring 30 million redshifts. DESI will perform stringent cosmological tests and will allow definitive tests of gravitational physics by constructing a unique redshift-space (3D) map of the large-scale structure of the Universe.

The research areas include the study of large-scale structure of the Universe, with particular emphasis on galaxy clustering or cosmic voids. Candidates with experience in cross-correlation analysis or cosmological probes combination using Cosmic Microwave Background or gravitational lensing are strongly encouraged to apply. The applicant should have a Ph. D. in astronomy/astrophysics/high energy physics, with expertise in (but not limited to): galaxy clustering; theoretical cosmology; gravitational lensing; and observational analysis of large datasets.

Interested candidates are asked to submit a CV, a research statement and a list of publications into a single pdf file to Dr. Stephanie Escoffier, escoffier@cppm.in2p3.fr. Applicants should also arrange for three letters of recommendation to be sent directly to Dr. Stephanie Escoffier. For full consideration, the application and recommendation letters must be received before February 8th, 2021. The position is expected to begin in Oct. 2021.

For further information please contact Dr. Stephanie Escoffier escoffier@cppm.in2p3.fr.

Included Benefits: French national medical insurance, maternity/paternity leave, lunch subsidies, family supplement for children, participation to public transport fees, pension contributions. Note that school is free in France for all children above 3. In addition, CNRS offers free French lessons.