Lara Čalić

Doctoral project

Search for double charged Higgs boson decays into the final states with same charged leptons with the ATLAS detector

My research focuses on using the ACTS KF to carry out the alignment of the ITk. The ACTS is an independent experiment toolkit used to reconstruct a trajectory of particles. Reconstruction consists of several steps, where track fitting, as one step, combines a series of measurements into the estimation of the properties of a charged particle. A popular method that can be used is the Kalman Filter method.

The alignment term refers to disclosing sensitive detector elements' empirical location and rotation that can be misaligned from their nominal placement due to external mechanical factors. We aim to enable writing out artificial misalignments, where the collaboration between alignment experts and me should result in understanding the information ACTS KF needs to supply. The requirements of the ATLAS alignment solver can be satisfied, but in the future, an adaptation of the current code with additional alignment calculations is going to be added.

The primary analysis explores the search for exotic Higgs boson decays to light pseudoscalars in the final state of leptons, using the proton-proton collisions at LHC at a center-of-mass energy of 13 TeV. Current searches for exotic Higgs boson decays are well motivated by various theoretical models, as well as the constraints from Higgs boson measurement results. Our expectations are the development of different datadriven techniques that can be used to estimate a background that can't model with the standard simulation in ATLAS.