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Reference : UMR6533-ROMMAD-001
Workplace : AUBIERE
Date of publication : Monday, March 11, 2019
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 September 2019
Proportion of work : Full time
Remuneration : 2530 - 2920 € gross monthly
Desired level of education : PhD
Experience required : 1 to 4 years
The postdoctoral researcher will be part of the ATLAS team and will be the main contributor of an emerging activity based on the group expertise: precision measurement in the top quark sector with the full Run 2 data set and the associated interpretation in effective field theory (EFT). This project is strongly motivated by the current experimental landscape and developments related to global EFT interpretations have already started in the experimental community. Indeed, the success of the Standard Model (SM) in explaining LHC data (among other observations) is both an impressive victory and a limitation since it means that no direct indication of beyond the SM (BSM) phenomena was seen in collider data. In addition, the hundreds of direct BSM searches keep pushing the exclusion limits to higher energy scales. In this context, EFT interpretation of precision measurements in the top quark sector offers an appealing approach to move forward, especially with the largest sample of proton-proton collision data to come during LHC Run 3.
- Better understand how EFT coefficients can affect the properties of the top quark;
- Measurement of the most relevant property with the best possible accuracy using the complete Run 2 data;
- Interpret this measurement in terms of constraints on EFT coefficients affecting the top quark;
- Combination of different measurements (asymmetry, spin correlation, W helicity, etc...) to obtain a more consistent constraint on EFT coefficients;
- Conduct original research independently and collaboratively;
- Work in collaboration with LPC members and french and international partners working on similar or related scientific problems;
- Prepare research articles for publication;
- Present the work at scientific conferences, workshops and seminars.
- PhD in experimental high-energy physics (preferably in ATLAS or CMS), absolutely obtained after september 2017;
- Research skills demonstrated by a leading contribution to a high-level physics analysis;
- Good knowledge of C++ and in particular of the ROOT analysis software;
- Fluency in spoken and written English;
- Ability to work in a team environment.
The Atlas@Clermont team is part of the Clermont Physics Laboratory (Laboratoire de Physique de Clermont, LPC) which also includes LHCb, ALICE, LSST and theoretical physics teams, as well as reasearch teams in physics applied to health, environment and energy. The LPC is hosted by the University of Clermont Auvergne (Université Clermont Auvergne, UCA) and is part of the National Institute for Particle and Nuclear Physics (IN2P3), a division of the french national research center (CNRS). Around half of the 160 members of the LPC work in one of the technical departments (IT, mechanics, electronics and microelectronics) or in the administrative department.
LPC is located in the suburbs of Clermont-Ferrand, a medium-sized but dynamic city in the east of the Auvergne-Rhônes-Alpes region, 3h30 drive from CERN. The city is on the edge of the Auvergne Volcanoes Regional Park, recently inscribed on UNESCO's World Heritage List. Many cultural activities are available, culminating each February with the International Short Film Festival (the world's largest festival in this field). Clermont-Ferrand is also the heart of the Michelin tire company. The public transport network is efficient, the LPC in particular benefits from a tram stop in the immediate vicinity. The cost of living in Clermont-Ferrand is low compared to large cities such as Lyon or Paris. Renting an apartment between 20 and 30 m2 in the city centre near the tram costs about 400 euros per month.
The Atlas@Clermont team receives substantial financial support each year from the CNRS/IN2P3, mainly covering travel expenses (to CERN, workshops and conferences) and local IT costs. It provides the team with a pleasant working environment (offices and laptops), including a dedicated local batch cluster with 200 TB of disk storage.
The team is a founding member of the ATLAS collaboration and has always had a significant contribution to the hadronic scintillating tile calorimeter (TileCal), as well as in physics analyses, particularly in connection with the top quark (first thesis on the subject defended in 2002). The Atlas@Clermont team is also active on upgrades for phase 2 of the HL-LHC, for many years now in TileCal and since 2018 in HGTD (High Granularity Timing Detector). For several years, the team has specialized in the research of new physics in final states containing one or more top quarks (ttbar resonances, tbbar resonances) and has in particular initiated in ATLAS in 2011 the search for events containing four top quarks. Since 2013, the team has also contributed significantly to the search for the associated production of a Higgs boson and a pair of top quarks (tth), finally observed in 2018.
Speaking french is not mandatory (there are currently seven different nationalities in the team) and free french courses will be available. Good knowledge of english is necessary. The application of females is encouraged as Atlas@Clermont applies affirmative-action measures to ensure gender equality in the recruitment process.
Constraints and risks
Short periods travel to CERN and possibly abroad should be expected.
Applicant must have obtained the PhD after september 2017. Applications should be submitted before May 20th containing a short curriculum vitae (2 pages maximum) and a motivation letter. Two recommendation letters should be sent to AtlasClermont.firstname.lastname@example.org.
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