0619527 - FZÚ 2026 RIV DE eng J - Journal Article
Aad, G. - Aakvaag, E. - Abbott, B. - Chudoba, Jiří - Federičová, Pavla - Hejbal, Jiří - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Nechanský, Filip - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2937 authors
Search for light neutral particles decaying promptly into collimated pairs of electrons or muons in pp collisions at √s = 13 TeV with the ATLAS detector.
European Physical Journal C. Roč. 85, č. 3 (2025), č. článku 335. ISSN 1434-6044. E-ISSN 1434-6052
R&D Projects: GA MŠMT(CZ) EH22_008/0004632
Research Infrastructure: CERN-CZ III - 90240
Institutional support: RVO:68378271
Keywords : ATLAS * CERN * Standard Model Higgs boson
OECD category: Particles and field physics
Impact factor: 4.2, year: 2023 ; AIS: 1.119, rok: 2023
Method of publishing: Open access
DOI: https://doi.org/10.1140/epjc/s10052-025-13916-5

A search for a dark photon, a new light neutral particle, which decays promptly into collimated pairs of electrons or muons is presented. The search targets dark photons resulting from the exotic decay of the Standard Model Higgs boson, assuming its production via the dominant gluon-gluon fusion mode. The analysis is based on 140 fb−1 of data collected with the ATLAS detector at the Large Hadron Collider from proton-proton collisions at a center-of-mass energy of 13 TeVTeV. Events with collimated pairs of electrons or muons are analysed and background contributions are estimated using data-driven techniques. No significant excess in the data above the Standard Model background is observed. Upper limits are set at 95% confidence level on the branching ratio of the Higgs boson decay into dark photons between 0.001% and 5%, depending on the assumed dark photon mass and signal model.
Permanent Link: https://hdl.handle.net/11104/0366214