Leiden University Student Repository

Charlaganova, Liya (2026)

CP-violation in the GGF HWW channel

Master thesis | Physics (MSc)

The Standard Model (SM) does not account for enough CP-violating processes to explain the matter-antimatter asymmetry seen in the universe. One promising area to look for additional CP-violation is the Higgs boson, which still houses unexplored areas due to its recent discovery. In this thesis, the Standard Model Effective Field Theory (SMEFT) approach was used to extend the Higgs sector beyond the SM. The sensitivity of the ATLAS detector at CERN to the CP-odd SMEFT operator OˆH ˜G in the ggF→HWW channel was studied. Different analyses on simulated data were compared in order to find an optimized strategy. It can be concluded that applying phase-space cuts on the leading di-jet mass mjj leads to a significant increase in sensitivity, especially when compared to cuts on pH T . The mjj > 200 GeV is deemed to be the most effective.

SMEFT

Standard Model

Higgs boson

CP-violation

Author

Charlaganova, Liya

Faculty

Faculty of Science

Specialisation

Cosmology

Supervisors

Vulpen, I.B. van
Brenner, L.
Rieger, O.

ECTS Credits

30

Language

en