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Author  |
ATLAS Collaboration (Aad, G. et al); Aikiot, A.; Amos, K.R.; Aparisi Pozo, J.A.; Bouchhar, N.; Cabrera Urban, S.; Cantero, J.; Cardillo, F.; Castillo Gimenez, V.; Chitishvili, M.; Costa, M.J.; Curcio, F.; Didenko, M.; Escobar, C.; Fiorini, L.; Fuster, J.; Garcia, C.; Garcia Navarro, J.E.; Gomez Delegido, A.J.; Gonzalez de la Hoz, S.; Guerrero Rojas, J.G.R.; Lacasta, C.; Marti-Garcia, S.; Martinez Agullo, P.; Melini, D.; Mitsou, V.A.; Monsonis Romero, L.; Moreno Llacer, M.; Munoz Perez, D.; Navarro-Gonzalez, J.; Poveda, J.; Prades Ibañez, A.; Rubio Jimenez, A.; Ruiz-Martinez, A.; Sabatini, P.; Saibel, A.; Salt, J.; Sanchez Sebastian, V.; Sayago Galvan, I.; Senthilkumar, V.; Soldevila, U.; Sanchez, J.; Torro Pastor, E.; Valero, A.; Valiente Moreno, E.; Valls Ferrer, J.A.; Varriale, L.; Villaplana Perez, M.; Vos, M.; Zakareishvili, T. |
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Title |
Search for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13 TeV pp collisions with the ATLAS detector |
Type |
Journal Article |
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Year |
2024 |
Publication |
European Physical Journal C |
Abbreviated Journal |
Eur. Phys. J. C |
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Volume |
84 |
Issue |
7 |
Pages |
757 - 42pp |
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Keywords |
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Abstract |
A search is presented for flavour-changing neutral-current interactions involving the top quark, the Higgs boson and an up-type quark (q = u, c) with the ATLAS detector at the Large Hadron Collider. The analysis considers leptonic decays of the top quark along with Higgs boson decays into two W bosons, two Z bosons or a tau(+)tau(-) pair. It focuses on final states containing either two leptons (electrons or muons) of the same charge or three leptons. The considered processes are t (t) over bar and Ht production. For the t (t) over bar production, one top quark decays via t -> Hq. The proton-proton collision data set analysed amounts to (140 fb(-1)) at (root s = 13 TeV). No significant excess beyond Standard Model expectations is observed and upper limits are set on the t -> Hq branching ratios at 95% confidence level, amounting to observed (expected) limits of B(t -> Hu) < 2.8 (3.0) x 10(-4) and B(t -> Hc) < 3.3 (3.8) x 10(-4). Combining this search with other searches for t Hq flavour-changing neutral-current interactions previously conducted by ATLAS, considering H -> b (b) over bar and H -> gamma gamma decays, as well as H -> tau(+)tau(-) decays with one or two hadronically decaying tau-leptons, yields observed (expected) upper limits on the branching ratios of B(t -> Hu) < 2.6 (1.8) x 10(-4) and B(t -> Hc) < 3.4 (2.3) x 10(-4). |
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Address |
[Filmer, E. K.; Grant, C. M.; Jackson, P.; Kong, A. X. Y.; Pandya, H. D.; Potti, H.; Ruggeri, T. A.; Saha, S.; Ting, E. X. L.; White, M. J.] Univ Adelaide, Dept Phys, Adelaide, SA, Australia |
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Publisher |
Springer |
Place of Publication |
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Language |
English |
Summary Language |
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Original Title |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1434-6044 |
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Conference |
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Notes |
WOS:001394617100001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6459 |
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