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Search for a resonance in the di-Higgs channel decaying into $\gamma \gamma \bar{b}b$ with the ATLAS detector

In 2012, the ATLAS and CMS experiments jointly discovered the Higgs boson, a key particle of the Standard Model (SM) of particle physics. This discovery raised new questions, in particular about the mass hierarchy. The existence of new particles could help answering this problem, a Higgs-like resona...

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Autor principal: Hulsken, Raphael
Lenguaje:eng
Publicado: 2021
Materias:
Acceso en línea:http://cds.cern.ch/record/2789101
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author Hulsken, Raphael
author_facet Hulsken, Raphael
author_sort Hulsken, Raphael
collection CERN
description In 2012, the ATLAS and CMS experiments jointly discovered the Higgs boson, a key particle of the Standard Model (SM) of particle physics. This discovery raised new questions, in particular about the mass hierarchy. The existence of new particles could help answering this problem, a Higgs-like resonance being one of them. Various theories beyond the Standard Model predict the existence of such new scalar particles that can decay into two Higgs bosons. Among the different decay channels, the decay of the first Higgs boson into a pair of photons and the second Higgs boson into a pair of b-quarks is one of the most promising since it benefits from the good di-photon resolution for the first one and the high branching ratio of the second one. This proceeding presents this search with 139 \ifb of data collected by the ATLAS detector \cite{ATLAS} at the LHC in 2015-2018. Limits on the production cross-section for a new particle over the mass range 251-1000 GeV are set, improving by up to a factor three the expected limit of the 36 \ifb result.
id cern-2789101
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2021
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spelling cern-27891012021-10-30T20:38:51Zhttp://cds.cern.ch/record/2789101engHulsken, RaphaelSearch for a resonance in the di-Higgs channel decaying into $\gamma \gamma \bar{b}b$ with the ATLAS detectorParticle Physics - ExperimentIn 2012, the ATLAS and CMS experiments jointly discovered the Higgs boson, a key particle of the Standard Model (SM) of particle physics. This discovery raised new questions, in particular about the mass hierarchy. The existence of new particles could help answering this problem, a Higgs-like resonance being one of them. Various theories beyond the Standard Model predict the existence of such new scalar particles that can decay into two Higgs bosons. Among the different decay channels, the decay of the first Higgs boson into a pair of photons and the second Higgs boson into a pair of b-quarks is one of the most promising since it benefits from the good di-photon resolution for the first one and the high branching ratio of the second one. This proceeding presents this search with 139 \ifb of data collected by the ATLAS detector \cite{ATLAS} at the LHC in 2015-2018. Limits on the production cross-section for a new particle over the mass range 251-1000 GeV are set, improving by up to a factor three the expected limit of the 36 \ifb result.ATL-PHYS-PROC-2021-087oai:cds.cern.ch:27891012021-10-29
spellingShingle Particle Physics - Experiment
Hulsken, Raphael
Search for a resonance in the di-Higgs channel decaying into $\gamma \gamma \bar{b}b$ with the ATLAS detector
title Search for a resonance in the di-Higgs channel decaying into $\gamma \gamma \bar{b}b$ with the ATLAS detector
title_full Search for a resonance in the di-Higgs channel decaying into $\gamma \gamma \bar{b}b$ with the ATLAS detector
title_fullStr Search for a resonance in the di-Higgs channel decaying into $\gamma \gamma \bar{b}b$ with the ATLAS detector
title_full_unstemmed Search for a resonance in the di-Higgs channel decaying into $\gamma \gamma \bar{b}b$ with the ATLAS detector
title_short Search for a resonance in the di-Higgs channel decaying into $\gamma \gamma \bar{b}b$ with the ATLAS detector
title_sort search for a resonance in the di-higgs channel decaying into $\gamma \gamma \bar{b}b$ with the atlas detector
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2789101
work_keys_str_mv AT hulskenraphael searchforaresonanceinthedihiggschanneldecayingintogammagammabarbbwiththeatlasdetector