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T: Fachverband Teilchenphysik

T 68: Higgs Physics VIII (CP)

T 68.9: Vortrag

Donnerstag, 3. April 2025, 18:15–18:30, ZHG105

CP violation in Standard Model extensions with a Higgs singlet — Greta Bösinger¹, •Lana Dambacher¹, and Heidi Rzehak² — ¹Institut für Theoretische Physik, Universität Tübingen — ²Physikalisches Institut, Universität Freiburg

In order to explain the asymmetry of matter and antimatter in our universe, a particle-physics model must contain sources of CP violation. Since the amount of CP violation provided by the Standard Model (SM) is not sufficient for this explanation, we are looking for extensions of the SM that include further sources of CP violation.

One of the simplest extensions of the SM is an extension with a complex Higgs SU(2)_L singlet. The singlet leads to a more involved Higgs potential, but otherwise does not couple to any other field. This results in some freedom in the definition of its CP transformation and therefore to no new CP violation. This freedom is reduced by coupling the singlet to a vector fermion, which creates the possibility of spontaneous or explicit CP violation.

In this talk the complex Higgs singlet extension with its possible CP properties is discussed.

Keywords: Higgs boson; CP violation; Beyond the Standard Model; Higgs Singlet