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Reference : UMR9012-MARLOU-008
Workplace : ORSAY
Date of publication : Monday, February 15, 2021
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 September 2021
Proportion of work : Full time
Remuneration : Between 2728 and 3145 € gross monthly depending on experience
Desired level of education : PhD
Experience required : 1 to 4 years
The postdoctoral researcher will be part of the ALICE team of IJCLab (see detailed description later). His/Her work will focus on the analysis of ALICE data, in particular the study of heavy flavor production (charm and beauty quarks) in heavy-ions and proton-proton collisions. These analyses are expected to lead one or several ALICE collaboration publications in peer-reviewed journals.
The ALICE muon spectrometer will be able to separate the prompt (c-cbar state) and non-prompt (b-hadron decay) of J/Ψ thanks to a new detector, the Muon Forward Tracker. In addition, a major upgrade of the readout upgrade of the existing parts will allow to record a statistic ten times larger than the one available from previous runs.
This opens the possibility to perform high precision measurements to separate Quark-Gluon Plasma effects on charm and beauty quarks at forward rapidity. In particular, only J/Ψ regeneration mechanisms though recombination of c and c-bar quarks seem capable to explain nuclear modification factor (RAA) values at low transverse momentum obtained during runs I and II of the LHC. These RAA measurements must be improved by considering the prompt-J/Ψ only to better probe the suppression/regeneration mechanisms. The elliptic flow of inclusive J/Ψ still eludes a clear interpretation and here again the separation of prompt and non-prompt components is needed. Finally the non-prompt J/Ψ studies will provide insight on b-quarks energy loss.
The study of proton-proton collisions will be considered in order to obtain J/Ψ (prompt and non-prompt) reference measurement for heavy-ions collisions and for theoretical models comparisons.
The postdoctoral researcher may have to work for a few months at CERN to participate in detector commissioning and data taking shifts.
Candidates should hold a PhD in a particle or nuclear physics field, a significant expertise in data analysis, high programming skills (c++ and root) and fluency in spoken and written English. Candidates must be capable to work in a team and in a large scientific collaboration.
The Laboratory of the Physics of the two infinities Irène Joliot-Curie (IJCLab) is a laboratory under the supervision of the CNRS, the University of Paris-Saclay and the University of Paris. The research axes of the laboratory are nuclear physics, high energy physics, astroparticles and cosmology, theoretical physics, accelerators and particle detection as well as research, development and applications for health, energy and environment.
The postdoctoral researcher will work in the ALICE group of IJCLab which is composed of four permanent researchers, one professor from Paris-Saclay University, two PhD students (among them one will defend his PhD in Oct. 2021), and one postdoc. She/He will work in an international collaboration and will present regularly (in English) his work in the group and in collaboration meetings. The participation in physics schools and the presentation of the results in international conferences is foreseen. The team has a recognized expertise in heavy-flavors analysis, especially about J/Ψ production, which lead to many related publications (http://cern.ch/go/Db7D).
Constraints and risks
Frequent travels (collaboration meetings, workshop, international conferences abroad) as well as on the CERN site (Switzerland) are expected. The postdoctoral researcher will contribute to general service tasks for the ALICE Collaboration. She/He will be also involved in the data taking at CERN for about 2 to 3 weeks per year (during those shifts work during nights and week-ends is expected).
Submit a cover letter and CV without any break in date showing diplomas, titles and work and professional experience. The CV must also include contact information of 4 referent persons. Two reference letters are requested, one letter should be provided by the latest employer or PhD thesis supervisor for candidates that have just obtained the degree.
Applications received by 31/3/2021 will be given full consideration, but we will keep accepting them until 1/5/2021.
As the post is located in a ZRR (restricted area), recruitment is conditional on obtaining a favourable approval from the HFSD. Consequently, the starting date is given for information only and may be postponed.
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