Search for Higgs boson decays into a pair of pseudoscalar particles in the γγτhadτhad final state using pp collisions at s = 13 TeV with the ATLAS detector
| dc.contributor.author | Leeuw, Lerothodi | |
| dc.contributor.author | Aad, Georges | |
| dc.contributor.author | Aakvaag, Erlend | |
| dc.date.accessioned | 2026-01-12T10:50:35Z | |
| dc.date.available | 2026-01-12T10:50:35Z | |
| dc.date.issued | 2025 | |
| dc.description.abstract | 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, B(H → aa → γγττ), ranging from 0.2% to 2%, depending on the a-boson mass hypothesis. | |
| dc.identifier.citation | Aad, G., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.J., Abidi, S.H., Aboelela, M., Aboulhorma, A., Abramowicz, H., Abulaiti, Y. and Acharya, B.S., 2025. Search for Higgs boson decays into a pair of pseudoscalar particles in the γγτhadτhad final state using pp collisions at $$\sqrt {\textrm {s}} $$= 13 TeV with the ATLAS detector. Journal of High Energy Physics, 2025(3), pp.1-39. | |
| dc.identifier.uri | https://doi.org/10.1007/JHEP03(2025)190 | |
| dc.identifier.uri | https://hdl.handle.net/10566/21658 | |
| dc.language.iso | en | |
| dc.publisher | Springer Science and Business Media Deutschland GmbH | |
| dc.subject | Hadron-Hadron Scattering | |
| dc.subject | Exotic Higgs decays | |
| dc.subject | Photon pair and τ-lepton pair final states | |
| dc.subject | ATLAS experiment | |
| dc.subject | Model-independent upper limits on branching ratio | |
| dc.title | Search for Higgs boson decays into a pair of pseudoscalar particles in the γγτhadτhad final state using pp collisions at s = 13 TeV with the ATLAS detector | |
| dc.type | Article |