Angles on CP-violation in Higgs boson interactions

Understand

CP-violation in the Higgs sector remains a possible source of the baryon asymmetry of the universe.

• Recent differential measurements of signed angular distributions in Higgs boson production provide a general experimental probe of the CP structure of Higgs boson interactions.
• We interpret these measurements using the Standard Model Effective Field Theory and show that they do not distinguish the various CP-violating operators that couple the Higgs and gauge fields.
• However, the constraints can be sharpened by measuring additional CP-sensitive observables and exploiting phase-space-dependent effects.