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T: Fachverband Teilchenphysik

T 79: Searches/BSM IV

T 79.3: Vortrag

Donnerstag, 19. März 2026, 16:45–17:00, KH 02.018

Collisionoperators in electroweak baryogenesis — •Johann Plotnikov¹, Margarete Mühlleitner¹, Rui Santos², and João Viana² — ¹KIT, Karlsruhe, Germany — ²Universidade de Lisboa, Lisboa, Portugal

It is known that extensions of the Standard Model are necessary to explain the observed Baryon Asymmetry of the Universe (BAU) as they are able to provide a strong first-order phase transition needed for electroweak baryogenesis. During the phase transition bubbles are created which separate the true vacuum from the broken vacuum. As the particles of the plasma collide with the bubble wall, the particles and anti-particles scatter differently to create the BAU. However, at the same time the surrounding plasma tries to wash out this asymmetry via collisions between the plasma particles. In our work we perform a careful derivation of the strength of these collisions and study their influence on the resulting BAU.

Keywords: Baryon asymmetry; Higgs extensions; Boltzmann equation