Search for Higgs boson decays into a pair of pseudoscalar particles in the γγτ.sub.had./sub.τ.sub.had./sub. final state using pp collisions at √s= 13 TeV with the ATLAS detector

Aad, G.; Aakvaag, E.; Abbott, B.; Chudoba, Jiří; Federičová, Pavla; Hejbal, Jiří; Jačka, Petr; Kepka, Oldřich; Kroll, Jiří; Kupčo, Alexander; Latoňová, Věra; Lysák, Roman; Marčišovský, Michal; Mikeštíková, Marcela; Nechanský, Filip; Němeček, Stanislav; Šícho, Petr; Staroba, Pavel; Svatoš, Michal; Taševský, Marek

doi:https://dx.doi.org/10.1007/JHEP03(2025)190

Number of the records: 1

Search for Higgs boson decays into a pair of pseudoscalar particles in the γγτ.sub.had./sub.τ.sub.had./sub. final state using pp collisions at √s= 13 TeV with the ATLAS detector

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SYSNO ASEP	0619501
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Ostatní články
Title	Search for Higgs boson decays into a pair of pseudoscalar particles in the γγτ_hadτ_had final state using pp collisions at √s= 13 TeV with the ATLAS detector
Author(s)	Aad, G. (FR) Aakvaag, E. (NO) Abbott, B. (US) Chudoba, Jiří (FZU-D)_{RID, ORCID} Federičová, Pavla (FZU-D)_ORCID Hejbal, Jiří (FZU-D)_{RID, ORCID} Jačka, Petr (FZU-D)_ORCID Kepka, Oldřich (FZU-D)_{RID, ORCID} Kroll, Jiří (FZU-D)_ORCID Kupčo, Alexander (FZU-D)_{RID, ORCID} Latoňová, Věra (FZU-D)_ORCID Lysák, Roman (FZU-D)_{RID, ORCID} Marčišovský, Michal (FZU-D)_{RID, ORCID} Mikeštíková, Marcela (FZU-D)_{RID, ORCID} Nechanský, Filip (FZU-D)_ORCID Němeček, Stanislav (FZU-D)_{RID, ORCID} Šícho, Petr (FZU-D)_{RID, ORCID} Staroba, Pavel (FZU-D)_{RID, ORCID} Svatoš, Michal (FZU-D)_{RID, ORCID} Taševský, Marek (FZU-D)_{RID, ORCID}
Number of authors	2915
Article number	190
Source Title	Journal of High Energy Physics. - : Springer - ISSN 1029-8479 Roč. 2025, č. 3 (2025)
Number of pages	38 s.
Language	eng - English
Country	DE - Germany
Keywords	ATLAS ; Hadron-Hadron Scattering ; CERN
Subject RIV	BF - Elementary Particles and High Energy Physics
OECD category	Particles and field physics
R&D Projects	EH22_008/0004632 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Research Infrastructure	CERN-CZ III - 90240 - Fyzikální ústav AV ČR, v. v. i.
Method of publishing	Open access
Institutional support	FZU-D - RVO:68378271
DOI	https://doi.org/10.1007/JHEP03(2025)190
Annotation	A search for exotic decays of the 125 GeV Higgs boson into a pair of new spin-0 particles, H → aa, where one decays into a photon pair and the other into a τ-lepton pair, is presented. Hadronic decays of the τ-leptons are considered and reconstructed using a dedicated tagger for collimated τ-lepton pairs. The search uses 140 fb−1 of proton-proton collision data at a centre-of-mass energy of √s = 13 TeV recorded between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider. The search is performed in the mass range of the a boson between 10 GeV and 60 GeV. No significant excess of events is observed above the Standard Model background expectation. Model-independent upper limits at 95% confidence level are set on the branching ratio of the Higgs boson to the γγττ final state, BB(H → aa → γγττ), ranging from 0.2% to 2%, depending on the a-boson mass hypothesis.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2026
Electronic address	https://hdl.handle.net/11104/0366164

Number of the records: 1