Search for Vector Like Leptons in the 4321 model using the ATLAS detector

Dutta, Sayantan (2023) Search for Vector Like Leptons in the 4321 model using the ATLAS detector. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS dissertation of Sayantan Dutta (18MS162)) Thesis_18MS162.pdf - Submitted Version Restricted to Repository staff only Download (20MB)

Abstract

This thesis presents searches for Vector Like Leptons (VLL’s) in the context of the ”4321 model” which is an ultraviolet-complete model with the potential to explain existing B physics measurements that are in tension with standard model predictions. The search is performed using proton-proton collision data collected with the ATLAS detector from 2015 to 2018 corresponding to the Run 2 dataset with a total integrated luminosity of 139 fb⁻¹ at √s = 13 TeV. The search targets pair production of VLL in one light lepton and two hadronically decaying τ−leptons (1l + 2τh) final state (l = e, μ). The resulting detector signature is expected to contain a light lepton, τ−leptons, jets, b-jets and missing transverse energy (MET). The signal region optimization is performed using multivariate techniques in the VLL mass range 400-1500 GeV.111

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