SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 106: Searches IV
T 106.3: Vortrag
Donnerstag, 23. März 2023, 16:20–16:35, HSZ/0403
Search for new physics in the final state with a lepton and pTmiss — •Valentina Sarkisovi, Thomas Hebbeker, Kerstin Hoepfner, Sebastian Wiedenbeck, and Christoph Schuler — III. Physikalisches Institut A, RWTH Aachen University
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 (pTmiss) 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 pTmiss. 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 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 pTmiss are addressed.