Abstract
Since the discovery of the Higgs boson at the Large Hadron Collider at CERN, measurements of its properties have been carried out. The results of these measurements are in good agreement with the Standard Model predictions.
There are still observations not explained by the Standard Model including the existence of dark matter, more matter than antimatter in the Universe, and the weak interaction stronger too much than the gravitational force. Physics beyond the Standard Model is therefore required. The precision of the Higgs boson property measurements is limited by the amount of data. Potential beyond the Standard Model physics might be discovered in further investigation of the Higgs boson properties with increasing data at the Large Hadron Collider.
The observation that there is more matter than antimatter in the Universe is known as the matter-antimatter asymmetry problem. The mechanism generating more baryons than antibaryons is a probable solution to this puzzle. The violation in the charge and parity conservation is required in such a mechanism. The CP violation in the Standard Model does not match the observed asymmetry. Contributions beyond the Standards Model are needed. There are potential contributions from beyond the Standard Model interactions between the Higgs boson and other elementary particles.
Among the Higgs boson decay channels at the Large Hadron Collider, the decay into four leptons through Z bosons is a "clean" channel to study. Its final state is fully reconstructable. Events in this channel are well-separated from the heavy multi-jet backgrounds at the Large Hadron Collider. These features make this channel suitable for studying possible beyond the Standard Model contribution to the Higgs boson couplings.
In this study, the potential violation of the charge and parity conservation in the Higgs boson coupling to Z bosons is tested. This measurement will inspire a deeper understanding of the matter-antimatter asymmetry problem and the Higgs boson.