[JC] Standard Model Baryon Number Violation at Zero Temperature from Higgs Bubble Collisions

by Sudhakantha Girmohanta

Thursday 23 Jul 2026, 15:00 → 16:00 Asia/Seoul

CTPU seminar room (IBS)

In this journal club talk, I will summarize the article published in PRL 136, 241803 (2026), on the results of a (3+1)D simulation of baryon number violation induced by Higgs bubble collisions.

Abstract of the paper: 
We compute for the first time baryon number violation at zero temperature from Higgs bubble collisions and find that it can be of the same order as that from thermal sphalerons in the symmetric phase at electroweak temperatures. We study the dependence of the rate of Chern-Simons number transitions on the shape of the scalar potential and on the Lorentz factor of the bubble walls at collision via large-scale (3+1)D lattice simulations of the Higgs doublet and SU(2) gauge fields. We estimate the resulting baryon asymmetry assuming some CP-violating source activated by the Higgs-field variation during the phase transition.

Authors:
Nabeen Bhusal, Simone Blasi, Martina Cataldi, Aleksandr Chatrchyan, Marco Gorghetto, and Geraldine Servant