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T: Fachverband Teilchenphysik

T 52: Search for new particles 4 (leptoquarks, LHC)

T 52.6: Vortrag

Mittwoch, 6. März 2024, 17:15–17:30, Geb. 20.30: 1.067

Search for new physics in the final state with a lepton and p_T^miss. — •Valentina Sarkisovi, Kerstin Hoepfner, and Thomas Hebbeker — RWTH Aachen University, Aachen, Germany

Various Beyond the Standard Model (BSM) theories anticipate the existence of new particles that could decay into final states characterized by the presence of a charged lepton and missing transverse momentum (p_T^miss) as their most distinctive experimental signature. The CMS detector at the CERN LHC is used to hunt for novel physics in the high mass region of final states containing a lepton (electron, muon, tau) and p_T^miss. Achievement of a high mass resolution, rejection of the standard model backgrounds, and efficient identification and reconstruction of TeV leptons are crucial in a search for such phenomena. One of the main challenges of this search is represented by the high rate of QCD multi-jet background produced in the LHC proton-proton collisions, leading to the possible misidentification of a jet as a lepton. Data driven methods as well as advanced machine learning technologies are used to model the QCD contamination and to properly identify leptons. The latest CMS data, recorded in 2022 and 2023 at unprecedented center-of-mass energy of 13.6 TeV, have been analysed. The key concepts of the analysis techniques employed in the search for new physics in the final state with a lepton and p_T^miss are addressed.

Keywords: Search; BSM