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Searching for dark matter at LHC in events with two leptons

The M2 internship can be expanded into a PhD focused on the preparation of direct and indirect searches for new phenomena in the final state with two leptons based on the Run 3 data set, which the ATLAS experiment will begin collecting in 2022.

Summary of the work required :

A common theme in many theories beyond the Standard Model of particle physics is the presence of the new neutral gauge bosons (Z’) with mass at the TeV scale. They have been extensively searched for at the Large Hadron Collider (LHC). The most recent lower limit on the mass of the Z’SSM decaying to two leptons was set by the ATLAS experiment to be 5.1TeV [Phys. Lett. B 796 (2019) 68 ]. This result used the full Run 2 (2015-2018) data set recorded in proton–proton collisions at a centre-of-mass energy of 13 TeV and corresponds to an integrated luminosity of 139 fb-1.

But this inclusive search might not have sensitivity to more complex new physics models. This project will focus on a search for a Z’DM boson produced in association with invisible dark matter particles, for which the signature is missing transverse momentum in the detector. Such models might have eluded detection up to now. The goal of the project will be to study sensitivity of this search to various dark matter benchmark models. This work will be done in the ATLAS group at LAPP in Annecy. LAPP is located 50 km from CERN.

Optional information on a possible PhD subject :

The M2 internship can be expanded into a PhD focused on the preparation of direct and indirect searches for new phenomena in the final state with two leptons based on the Run 3 data set, which the ATLAS experiment will begin collecting in 2022. The technical part of the thesis will be related to the construction of the new inner tracking pixel detector (ITK-pixel) for the High Luminosity LHC (2027+), involving work on the set up and operation of the system tests for the ITK modules assembled at LAPP.

The duration of the thesis is three years. An extended stay at CERN is possible during the PhD thesis. The proximity of LAPP to CERN facilitates the direct involvement of the student in the life of the experiment, including shifts and collaboration meetings. Communication with theorists is also facilitated by the presence of the theoretical physics laboratory, LAPTh, in the same building.

o Niveau : Master 2

o Responsable : Tetiana Berger- Hryn’ova Jared Little

o Téléphone : 04 50 09 16 77

o e-mail : hrynova@lapp.in2p3.fr jared.little@cern.ch

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