Improving previous constraints on Higgs coupling to SM matter fields using an effective field theory framework restricted to operators of mass dimension 8

• Erling Nupen (University of Oslo)

The Higgs boson's couplings to Standard Model matter fields have been found to be consistent with the predictions of the Standard Model. However, small deviations have been observed, and an effective field theory framework can be used to describe them. In this framework, operators of mass dimension 6, along with the $STU$ parameters, have been used to parameterize any potential new physics. It is yet to be determined however, whether operators of mass dimension 8 may provide an even more accurate characterization of the deviations between the Higgs coupling and matter fields at the current collision rate at the LHC. It is hoped that utilizing an effective lagrangian with operators of mass dimension 8 will provide even stronger constraints on the Higgs effective couplings.

Pushing the antimatter frontier with positronium

• Jan Malamant (University of Oslo (NO))

Positronium (Ps) is the bound state of an electron and a positron, and is an exotic atom that shares many characteristics with hydrogen while being composed of equal parts matter and antimatter. Due to its purely leptonic nature and low mass, this atomic system has garnered interest for high-precision spectroscopy, tests of quantum electrodynamics, and is used by two experiments at the antimatter facility at CERN to produce antihydrogen. In this talk I will introduce the Ps production and ongoing cooling trials at the AEgIS experiment, as well as my simulations on ultrafast laser cooling.