Search for the decay of the Higgs boson to a Z boson and a light pseudoscalar particle decaying to two photons

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00587963" target="_blank" >RIV/68378271:_____/24:00587963 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21220/24:00380295 RIV/68407700:21240/24:00380295 RIV/68407700:21340/24:00380295 RIV/68407700:21670/24:00380295 RIV/61989592:15310/24:73627890
Result on the web
<a href="https://hdl.handle.net/11104/0355035" target="_blank" >https://hdl.handle.net/11104/0355035</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.physletb.2024.138536" target="_blank" >10.1016/j.physletb.2024.138536</a>

Result language
angličtina
Original language name
Search for the decay of the Higgs boson to a Z boson and a light pseudoscalar particle decaying to two photons
Original language description
A search for the decay of the Higgs boson to a ZZ boson and a light, pseudoscalar particle, aa, decaying respectively to two leptons and to two photons is reported. The search uses the full LHC Run 2 proton-proton collision data at s=13s =13 TeV, corresponding to 139 fb−1−1 collected by the ATLAS detector. This is one of the first searches for this specific decay mode of the Higgs boson, and it probes unexplored parameter space in models with axion-like particles (ALPs) and extended scalar sectors. The mass of the aa particle is assumed to be in the range 0.1-33 GeV. The data are analysed in two categories: a merged category where the photons from the aa decay are reconstructed in the ATLAS calorimeter as a single cluster, and a resolved category in which two separate photons are detected. The main background processes are from Standard Model ZZ boson production in association with photons or jets.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics

Project
<a href="/en/project/EH22_008%2F0004632" target="_blank" >EH22_008/0004632: Fundamental constituents of matter through frontier technologies</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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