Search for Higgs boson decays into a Z boson and a light hadronically decaying resonance in pp collisions at root s=13 TeV with the ATLAS detector
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F25%3A00388242" target="_blank" >RIV/68407700:21220/25:00388242 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21240/25:00388242 RIV/68407700:21340/25:00388242 RIV/68407700:21670/25:00388242
Result on the web
<a href="https://doi.org/10.1016/j.physletb.2025.139671" target="_blank" >https://doi.org/10.1016/j.physletb.2025.139671</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.physletb.2025.139671" target="_blank" >10.1016/j.physletb.2025.139671</a>
Alternative languages
Result language
angličtina
Original language name
Search for Higgs boson decays into a Z boson and a light hadronically decaying resonance in pp collisions at root s=13 TeV with the ATLAS detector
Original language description
A search for decays of the Higgs boson into a Z boson and a light resonance, with a mass of 0.5-3.5 GeV, is performed using the full 140 fb(-1) dataset of 13 TeV proton-proton collisions recorded by the ATLAS detector during LHC Run 2. Leptonic decays of the Z boson and hadronic decays of the light resonance are considered. The resonance can be interpreted as a J/psi or eta(c) meson, an axion-like particle, or a light pseudoscalar predicted in two-Higgs-doublet models. Due to its low mass, this resonance is produced with a high Lorentz boost in the laboratory frame and therefore reconstructed as a single small-radius jet of hadrons. A neural network is used to correct the Monte Carlo simulation of the total expected background using data from sideband regions. Two additional neural networks are used to distinguish signal from background, enhancing the purity of the signal region. A binned profile-likelihood fit is performed on the final-state invariant mass distribution. No significant excess of events relative to the expected background is observed, and upper limits at 95% confidence level are set on the Higgs boson's branching fraction to a Z boson and a light resonance. The exclusion limit is similar to 10% for the lower masses, and increases for higher masses. Upper limits on the effective coupling C-ZH(eff)/A of an axion-like particle to a Higgs boson and.. boson are also set at 95% confidence level, and range from 0.9 to 2 TeV-1.
Czech name
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Czech description
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Classification
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
Result continuities
Project
<a href="/en/project/EH22_008%2F0004632" target="_blank" >EH22_008/0004632: Fundamental constituents of matter through frontier technologies</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physics Letters B
ISSN
0370-2693
e-ISSN
1873-2445
Volume of the periodical
868
Issue of the periodical within the volume
139671
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
24
Pages from-to
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UT code for WoS article
001534621000001
EID of the result in the Scopus database
2-s2.0-105010717054