Search for tt[bar]H/A → tt[bar] tt[bar] production in proton-proton collisions √s=13TeV with the ATLAS detector
A search is presented for a heavy scalar (H) or pseudo-scalar (A) predicted by the two-Higgs-doublet models, where the H/A is produced in association with a top-quark pair (tt[bar]H/A), and with the H/A decaying into a tt[bar] pair. The full LHC Run 2 proton-proton collision data collected by the AT...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , |
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| Körperschaft: | |
| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
26 May 2025
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| In: |
The European physical journal. C, Particles and fields
Year: 2025, Jahrgang: 85, Heft: 5, Pages: 1-36 |
| ISSN: | 1434-6052 |
| DOI: | 10.1140/epjc/s10052-025-14041-z |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-025-14041-z
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| Verfasserangaben: | ATLAS Collaboration* |
MARC
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| 245 | 1 | 0 | |a Search for tt[bar]H/A → tt[bar] tt[bar] production in proton-proton collisions √s=13TeV with the ATLAS detector |c ATLAS Collaboration* |
| 246 | 3 | 0 | |a sqrt |
| 246 | 3 | 3 | |a Search for t t [bar] H / A → t t [bar] t t [bar] production in proton-proton collisions square root s = 13 TeV with the ATLAS detector |
| 264 | 1 | |c 26 May 2025 | |
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| 500 | |a *ATLAS Collaboration: G. Aad, A. Ackermann, L.M. Baltes, F. Bartels, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, T. Mkrychyan, D.F. Rassloff, L. Sanfilippo, C. Sauer, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, P. Starovoitov, L. Vigani, M. Wessels, J. Zinsser [und sehr viele weitere Personen] | ||
| 520 | |a A search is presented for a heavy scalar (H) or pseudo-scalar (A) predicted by the two-Higgs-doublet models, where the H/A is produced in association with a top-quark pair (tt[bar]H/A), and with the H/A decaying into a tt[bar] pair. The full LHC Run 2 proton-proton collision data collected by the ATLAS experiment is used, corresponding to an integrated luminosity of 139 fb -1. Events are selected requiring exactly one or two opposite-charge electrons or muons. Data-driven corrections are applied to improve the modelling of the tt[bar]+jets background in the regime with high jet and b-jet multiplicities. These include a novel multi-dimensional kinematic reweighting based on a neural network trained using data and simulations. An H/A-mass parameterised graph neural network is trained to optimise the signal-to-background discrimination. In combination with the previous search performed by the ATLAS Collaboration in the multilepton final state, the observed upper limits on the tt[bar]H/A → tt[bar] tt[bar] production cross-section at 95% confidence level range between 14 fb and 5.0 fb for an H/A with mass between 400 GeV and 1000 GeV, respectively. Assuming that both the H and A contribute to the tt[bar] tt[bar] cross-section, tan beta values below 1.7 or 0.7 are excluded for a mass of 400 GeV or 1000 GeV, respectively. The results are also used to constrain a model predicting the pair production of a colour-octet scalar, with the scalar decaying into a tt[bar] pair. | ||
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