More Higgses at the LHC and the Electroweak Phase Transition

• Main Authors: Dorsch, G. C, Huber, S. J, Mimasu, K, No, J. M
• Format: Journal Article
• Language: English
• Published: 05.11.2015
• Subjects: Physics - High Energy Physics - Phenomenology
• DOI: 10.48550/arxiv.1511.01689

A cosmological first order electroweak phase transition could explain the origin of the cosmic matter-antimatter asymmetry. While it does not occur in the Standard Model, it becomes possible in the presence of a second Higgs doublet. In this context, we obtain the properties of the new scalars $H_0$, $A_0$ and $H^{\pm}$ leading to such a phase transition, showing that its key LHC signature would be the decay $A_0 \rightarrow H_0 Z$, and we analyze the promising LHC search prospects for this decay in the $\ell \ell b\bar{b}$ and $\ell \ell W^{+} W^{-}$ final states. Finally, we comment on the impact of the $A_0 \rightarrow H_0 Z$ decay on current LHC searches for $A_0$ decaying into SM particles.