Speaker
Description
We develop a new class of experimental search for new Higgs-like spin-0 particles with the ATLAS experiment at LHC. We focus on the essentially unexplored asymmetric Higgs decay $X \rightarrow SH$, where $X$ and $S$ denote two BSM spin-0 Higgs-like neutral particles and $X$ is the heavier of the two ($m_X > m_S$). $H$ denotes the already experimentally known Higgs boson with a mass of $m_H = 125$ GeV. This type of LHC signature arises in models that predict primordial Gravitational Waves (GW) and are able explain the baryon- antibaryon asymmetry of the universe via Strong First Order Electroweak Phase Transition which generates primordial GW in the process. In this talk we present the construction of a search for $X \rightarrow SH$ in the two photon, two b-jet final states and projected sensitivities with Run-2 and Run-3 data.
