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Portail > Offres > Offre UMR5814-CLABOM-054 - Post-doctorant sur LHCb pour étudier les désintégrations radiatives des B et participer au fonctionnement du calorimètre (H/F)

Postdoc position in LHCb to work on the analysis of radiative B decays and on calorimeter operation (M/F)

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : mercredi 7 juillet 2021

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General information

Reference : UMR5814-CLABOM-054
Date of publication : Wednesday, May 26, 2021
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 October 2021
Proportion of work : Full time
Remuneration : between 2648 € and 3054 € monthly gross, according to work experience
Desired level of education : PhD
Experience required : Indifferent


The LHCb group of LAPP is inviting applications for a postdoctoral position to work on physics analysis of radiative decays and detector operation (calorimeter commissioning and validation of the first Run 3 data). The group has a long-standing expertise in flavour physics and calorimetry and is currently engaging in 𝐵𝑠 → 𝜇𝜇𝛾 analysis which can be measured in a kinematical region which is especially sensitive to the two semileptonic operators that now display the largest discrepancy with respect to the SM.


Physics analysis: A whole body of data on 𝐵-meson decays display persistent deviations from Standard-Model (SM) predictions. These data constitute the single, coherent array of deviations from the SM, and in a set of processes sensitive to new effects. Most remarkably, data seem to sit always on a given side with respect to the SM prediction. These data clearly need be scrutinized exploiting the full LHC dataset from Run 2 and beyond. The LAPP group collaborates with theorists from LAPTh in particular through the co-supervision of PhD students, which allows a constant follow-up between the theory and the different experimental facets.

The successful candidate will contribute to this experimental input focusing on the analysis of radiative decays 𝐵s → 𝜇𝜇𝛾 which offers a plethora of observables allowing to perform novel tests of the underlying 𝑏 → 𝑠 effective theory by exploiting the data from the LHC. The candidate will assume a leading role in the analysis.

Detector operation: 
Since the end of 2018, the LHCb experiment has undergone a major metamorphosis for the restart of the LHC in 2022: A revolutionary triggering system will allow efficient operation at higher luminosity and greatly increase the efficiency of hadronic final states selection. The LAPP team is strongly involved in this update work with the complete revision of the LHCb software in order to modernize and optimize the reconstruction algorithms for calorimetric objects. 

The candidate will actively participate in the commissioning of the calorimeter system as well as the validation of the first data of the run 3 and their Monte Carlo simulations, which also represent an important stake. The candidate will also explore new techniques based on machine and deep learning to improve the reconstruction quality in high pile-up conditions and to benefit from substantial speed-ups available on massively parallel architectures and on GPUs which are accessible on the MUST meso-center platform hosted in LAPP.

Attachment: LHCb experiment


- Education: PhD in experimental particle physics.
- Physics: Acquaintance with flavour physics is preferred though not mandatory.
- Programming: Skills in C++, ROOT and python.
- Language: Fluency in spoken and written English. Some level of French will be useful.
- Good communication skills and ability to work in a team.

Experience required: 1 to 2 years

Applicants must submit a cover letter explaining their interest in the position and a detailed curriculum vitae (containing a description of their research experience with a list of publications highlighting their personal contributions).

Have referrals to send at least 2 letters of recommendation directly to lapp_administration_rh_secretariat@lapp.in2p3.fr

Work Context

LAPP is a combined CNRS and Université de Savoie Mont-Blanc unit. Close to 150 people are working at LAPP: researchers, professors, engineers and support staff, students and visiting scientists. The laboratory is very actively involved in several large international collaborations working on accelerators (ATLAS and LHCb on the LHC at CERN, BaBar at SLAC in California, OPERA in Gran Sasso) and astroparticle experiments (Virgo, AMS, H.E.S.S. and CTA). Involved in many R&D and construction programs for large research infrastructures, the laboratory's skills cover a large scope of domains involving innovative technologies in micro-electronics, complex mechanical structure design and optimization, grid computing and scientific software developments. The location of LAPP, 50 km from CERN, and the presence of the theory laboratory LAPTh in the same premises, make the LAPP campus a very attractive research place for scientists contributing to particle and astroparticle physics. LAPP hosts the MUST mid-range data storage and computing centre - widely open to distributed computing infrastructure supporting research and academic projects.

LHCb is one of the four main experiments at LHC (with ATLAS, CMS and ALICE) and is dedicated to the study of heavy flavour physics which is essential to the indirect search for physics beyond the standard model by means of precision measurement of CP violation in beauty and charm hadrons. The LAPP group has a long-standing expertise in flavour physics and calorimetry since the beginning of the data taking of the experiment. It contributed significantly to the migration of the calorimeters calibration to the online trigger system for the start of data taking in 2015. Several members had convenership responsibility in the calorimeter objects and particle identification working group. The group also published several studies on the Dalitz plot analysis of open-charm decays as well as on quarkonia spectroscopy. Finally, the group takes a leading role in the development of firmware and of the novel 40 MHz data acquisition system for the upcoming LHCb upgrade.

Constraints and risks

Some short trips have to be planned in France and abroad

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