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Portail > Offres > Offre UMR7178-REGSOM-127 - H/F Postdoctorant-e en physique des particules

M/W Post-Doc in particle physics

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

Date Limite Candidature : lundi 17 octobre 2022

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General information

Reference : UMR7178-REGSOM-127
Workplace : STRASBOURG
Date of publication : Friday, September 16, 2022
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 December 2022
Proportion of work : Full time
Remuneration : Between 2,690.43 and 3,821.07 euros gross monthly according to experience
Desired level of education : PhD
Experience required : Indifferent

Missions

In the context of CMS (Compact Muon Solénoïd) and the FCCee (Future Circular Collider e+e-) the post-doctoral researcher will participate to the tracking and vertexing improvements in those various conditions. He will also contribute to the physics analysis of the BSM search channels in particular for LLP (Long Lived Particles).

For this purpose, the post-doc will participate to the modelling of the inner tracker using High Energy Physics (HEP) toolkits dedicated for linear colliders (ilcSoft, FCC Software) and will participate in the development of key4HEP, a unified software for linear colliders simulation. To test the performances of the detector, the candidate will also participate to the implementation of tracking and vertexing algorithms, benefiting from the expertise gains from the CMS collaboration.

The main objective of the simulation is to propose an inner tracker equipped with CMOS sensors, using estimated performances included in Look-Up Tables (LUT). Sensor's response as a function of different parameters (particle type, energy, angle of incidence) will be tabulated within the LUT. In case of lacking data, the LUT tables will be completed with the simulation of charge propagation within sensors using the Allpxi2 toolkit. The proposed roadmap will enable a tracker geometry design based on realistic CMOS performances that optimizes the quark flavors tagging and the LLP displaced vertex reconstruction, allowing the investigation of BSM Physics at FCCee.

Activities

- Participation to the physics analysis of CMS data by improving tracking and vertexing algorithms, and contributing to a search for long lived exotic particles.
- Improve a full Monte Carlo simulation of a tracker detector at FCCee in order to optimize the reconstruction of displaced vertex due to Long Lived Particles.
- (Co)writing papers presenting results of CMS physics analysis and FCCee Long Lived Particles prospective studies

Skills

- Good knowledge of the CMS software
- Good experience on tracking or vertexing
- Experience on Monte Carlo simulation.
- Team working ability
- English at level B2 according to the Common European Framework of Reference for Languages

Work Context

The IPHC, a joint research unit under the co-supervision of CNRS and Strasbourg University (UMR7178), is a pluridisciplinary laboratory where research groups from various scientific fields (ecology, physiology and ethology, chemistry and subatomic physics) develop high level research program with a strong instrumentation basement. IPHC is composed of 4 departments and counts a total number of 393 agents including 257 permanent position (119 researchers, assistant-professors and professors and 138 engineers and technicians), 46 fixed term contracts.

The Institut Pluridisciplinaire Hubert Curien (IPHC) at Strasbourg is opening a 24-month postdoctoral position in particle physics focused on the search of new physics Beyond the Standard Model (BSM). This research activity will be carried out in the context of the CMS experiment at the LHC and the Future Circular Collider (FCCee), an electron-positron collider project in alignment with the European Commission for Future Accelerators recommendation.
Therefore, the project will be held in strong collaboration between two groups of IPHC: the CMS team and the team involved in electron-positron collider physics (PICSEL).

The CMS group at IPHC is strongly involved in the search for new physics, which is expected to solve some of the present limitations of the standard model of particle physics. In this respect, the search for new heavy particles with a long lifetime is theoretically appealing.

Models of new physics, such as Super-Symmetry (SUSY), predict the existence of long-lived particles (LLP) which can occur in various scenarios. In particular, several LLP processes will be considered which can provide displaced top quarks in the final state, as the production of neutralino in R-parity violated Minimal Supersymmetric Standard Model (MSSM), stop in Gauge Mediated Sypersymmetry Breaking mechanism (GMSB), or gluino in split SUSY. Such decays provide many charged particles and jets, allowing the detector capabilities, especially the CMS tracker, to be fully exploited. The LLP analysis, in particular in case of experimental signatures with displaced vertices, relies heavily on the performances of tracks and vertex reconstructions, which are challenging for largely displaced decays. Depending on the considered BSM process, the charged particles issued from the LLP can be either rather soft and isotropic, or energetic and highly collimated.

This expertise will be then of great benefit for FCCee analyses. During the last two decades the PICSEL group at IPHC has acquired a strong expertise in the conception, the design and the performance evaluation of CMOS sensors, considered as favorable candidates to equip the inner track of the future Higgs Factories machine, thanks to their high granularity and low material budget. The acquired know-how in tracking and vertexing techniques will be used to optimize the design of the FCC inner tracker.

The CMS group is composed of 11 permanent researchers, 5 PhD students and many engineers and technicians involved on the Tracker upgrade for the high luminosity LHC.
The PICSEL group is composed of 3 permanent researchers, 2 post-docs, 1 engineer and 1 PhD student.

Constraints and risks

Participation in working meetings in Europe once a quarter and regular trips to Europe for beam tests.

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