Search in the dilepton final state in proton–proton collisions at √s=13 TeV with the ATLAS detector (20' talk + 10' Q/A)

• Tom CAVALIERE (LAPP)

Room: Auditorium Marcel Vivargent The Standard Model of particle physics provides a highly successful framework for understanding fundamental forces and particles. However, it leaves several open questions, including the nature of dark matter and the mechanism behind electroweak symmetry breaking, which motivate the search for new physics beyond the Standard Model. To address these questions, two analyses are conducted using proton-proton collision data at √s = 13 TeV with the ATLAS detector, focusing on the dilepton final state (electron and muon pairs). The first analysis searches for new heavy Z' bosons, where the dilepton final state is accompanied by vector boson fusion (VBF) jets. While no definitive results have been obtained, early hints suggest the possibility of new physics signatures that merit further investigation. The second analysis measures the double differential cross-section of high-mass Drell-Yan production in an exclusive final state with b-jets, offering a precise test of Standard Model predictions at high energies.

Galaxy cluster detection with LSST : photometric calibration, bright object masks and AMICO (20' talk + 10' Q/A)

• Nathan Amouroux

Room: Auditorium Marcel Vivargent The Legacy Survey of Space and Time (LSST) is a 10-year survey that will be conducted by the Vera Rubin Observatory (VRO). We will focus on the preparation of the analysis for galaxy clusters in VRO through three projects: 1) Preparation of the calibration of the telescope's photometric response with the Colimated Beam Projector (CBP). 2) Bright objects masking at the object catalog level. 3) Galaxy clusters detection with the Adaptative Matched Identifier of Clustered Objects (AMICO) algorithm.