Search for Higgs boson exotic decays into Lorentz-boosted light bosons in the four-τ final state at root s=13 TeV with the ATLAS detector

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F25%3A00388243" target="_blank" >RIV/68407700:21220/25:00388243 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21240/25:00388243 RIV/68407700:21340/25:00388243 RIV/68407700:21670/25:00388243
Result on the web
<a href="https://doi.org/10.1016/j.physletb.2025.139843" target="_blank" >https://doi.org/10.1016/j.physletb.2025.139843</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.physletb.2025.139843" target="_blank" >10.1016/j.physletb.2025.139843</a>

Result language
angličtina
Original language name
Search for Higgs boson exotic decays into Lorentz-boosted light bosons in the four-τ final state at root s=13 TeV with the ATLAS detector
Original language description
A search for exotic decays of the Higgs boson into a pair of low-mass scalars that subsequently decay into tau -leptons, H -> aa -> tau(+)tau(-)tau(+)tau(-), is presented. In models with Yukawa-like couplings, the decay to tau-leptons is favoured for light a-bosons, with mass in the range of 2m(tau) < m(a) < 2m(b). Results are presented in the range of 4 GeV < m(a) < 15 GeV using the 140 fb(-1) of proton-proton collisions at root s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider. This search focuses on the scenario where, for both di-tau pairs, one of the tau-leptons decays to hadrons and neutrinos, while the other decays to a muon and neutrinos. In this mass range, the a -> tau(+)tau(-) is Lorentz-boosted and a dedicated muon removal technique is used to reconstruct the di-tau pairs. No significant excess above the Standard Model background prediction is observed. Upper limits on (sigma(H)/sigma(SM)(H)) x B(H -> aa -> 4 tau) at 95% confidence level are provided, ranging from 0.03 to 0.10 depending on the a-boson mass.
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
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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