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
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...
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Langue: | anglais |
| Publié: |
March 25, 2025
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| In: |
Journal of high energy physics
Year: 2025, Numéro: 3, Pages: 1-38 |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP03(2025)190 |
| Accès en ligne: | Resolving-System, kostenfrei, Volltext: https://doi.org/10.1007/JHEP03(2025)190 Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/jhep03(2025)190 
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| Notes sur l'auteur: | the ATLAS collaboration |
| Résumé: | 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 sqrt{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. |
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| Description: | The ATLAS collaboration: G. Aad, A. Ackermann, M. Backes, L.M.Baltes, F. Bartels, S. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, T. Mkrtchyan, D.F. Rassloff, L. Sanfilippo, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, L. Vigani, S. Weber, M. Wessels, J. Zinsser [und viele weitere] Im Titel sind die beiden Angaben "had" tiefgestellt Gesehen am 17.06.2026 |
| Description matérielle: | Online Resource |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP03(2025)190 |