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T: Fachverband Teilchenphysik

T 31: Methods in particle physics 3 (lepton reconstruction)

T 31.8: Talk

Tuesday, March 5, 2024, 17:45–18:00, Geb. 20.30: 2.066

Prompt Lepton Improved Veto (PLIV) Muon Studies and Application for Multi-Lepton Final States — •Stephen Eggebrecht, Steffen Korn, Arnulf Quadt, Baptiste Ravina, and Tim Schlömer — II Physikalisches Institut, Georg August Universität Göttingen

Prompt leptons originate from decays of electroweak bosons, like W and Z, or from Higgs bosons and are associated with tracks matching with the primary collision vertex. In contrast, non-prompt or fake leptons may be produced in c- or b-hadron decays and are usually associated with secondary vertices. In multi-lepton ttH or four top analyses, fake-leptons are a major background even with tight standard isolation and impact parameter requirement. Other multivariate techniques which identify prompt-leptons while veto non-prompt are needed.
The prompt lepton improved veto (PLIV) uses several input features such as standard isolation variables. Using additional isolation variables constructed with calorimeter information and lepton lifetime information from the combination of direction and impact parameter variables of reconstructed lepton tracks, the performance is improved.
In this talk, new neural network techniques for PLIV for non-prompt muon rejection are presented and discussed. Furthermore, the first steps of calibration and application for multi-lepton final states are shown.

Keywords: Non-Prompt Lepton Rejection; Multilepton Analysis