Electroweak baryogenesis and gravitational waves in a composite Higgs model with high dimensional fermion representations
Ke-Pan Xie, Ligong Bian, Yongcheng Wu
Abstract
A bstract We study electroweak baryogenesis in the SO(6)/SO(5) composite Higgs model with the third generation quarks being embedded in the 20 ′ representation of SO(6). The scalar sector contains one Higgs doublet and one real singlet, and their potential is given by the Coleman-Weinberg potential evaluated from the form factors of the lightest vector and fermion resonances. We show that the resonance masses at $$ \mathcal{O}\left(1\sim 10\kern0.5em \mathrm{TeV}\right) $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>O</mml:mi><mml:mfenced><mml:mrow><mml:mn>1</mml:mn><mml:mo>∼</mml:mo><mml:mn>10</mml:mn><mml:mspace/><mml:mi>TeV</mml:mi></mml:mrow></mml:mfenced></mml:math> can generate a potential that triggers the strong first-order electroweak phase transition (SFOEWPT). The CP violating phase arising from the dimension-6 operator in the top sector is sufficient to yield the observed baryon asymmetry of the universe. The SFOEWPT parameter space is detectable at the future space-based detectors.