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Home page > Training > PhD and internships (M2)

M2 Internship : Probing new phenomena through precision measurements in the dilepton final state at the LHC

While the Standard Model (SM) has been proven to be tremendously successful, there is a lot of experimental evidence which points to it being an incomplete description of our universe. As no direct evidence for phenomena beyond SM have been seen at the LHC yet, precision measurements of SM processes have become more interesting due to their unique sensitivity to new phenomena at mass scales beyond the reach of direct production at the LHC. This internship will focus on the production of a dilepton system from a quark-quark initial state known as Drell-Yan scattering. This process was crucial to the establishment of the SM through discoveries of the J/ψ and Υ mesons in the 1970s and the Z and W bosons in the 1980s. Measurements in the high-mass regime can be used to constrain new phenomena in the effective field theory framework, profiting from the clean detector signature of this process. Sensitivity to new phenomena could be further improved by associating additional bottom-quark-tagged jets to the dilepton production. Powerful lepton universality tests can be performed by looking for discrepancies between the different lepton flavours in this region. The project will focus on the analysis of the dielectron and dimuon final states in association with bottom-quark-tagged jets using LHC Run-2 (2015-2018) data collected with the ATLAS detector. The student will specifically look at the interpretation of the final cross-section measurements in the effective field theory framework. This work will be done within the ATLAS group at LAPP in Annecy. LAPP is located 50 km from CERN. A good level of spoken English is required. The project will involve programming, so knowledge of C++ or python is recommended. Prospective candidates should contact the internship supervisors by email.

This M2 internship can be expanded into a PhD based on studies described above focusing on combined Run 2 and Run 3 (2022-2025) ATLAS Drell-Yan measurements in the light lepton channels ev/μv/ee/µµ. The technical part of the thesis will focus on the innovative improvements to the ATLAS electron performance in both real-time (trigger) and offline physics analysis environments applying the cutting-edge machine-learning techniques. The work will be done in the context of the ERC Consolidator Grant DITTO (2023-2028).

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

  • Supervisors : Tetiana Berger-Hryn’ova , Daniel Lewis
  • Phone Number : 0450091677
  • Mail : hrynova@lapp.in2p3.fr, daniel.lewis@cern.ch