Fysikdagarna 2022

Search for Higgs-like scalar particles in the bbγγ final state with the ATLAS experiment.

15 Jun 2022, 09:45

15m

Parallel session: partikelsektionen Sektionen för elementarpartikel och astropartikelfysik

Speaker

Stefio Yosse Andrean (Stockholm University (SE))

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 $X\to SH$, 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 $X\to SH$ in the two photon, two b-jet final states and projected sensitivities with Run-2 and Run-3 data.

Presentation materials

yosse_partikeldagarna2022.pdf