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Author  |
ATLAS Collaboration (Aad, G. et al); Aikot, A.; Amos, K.R.; Bouchhar, N.; Cabrera Urban, S.; Cantero, J.; Carrion Martinez, C.; 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.; Hofer, J.; Jimenez Ortega, M.; Lacasta, C.; Lanzac Berrocal, M.; Marti-Garcia, S.; Martinez Agullo, P.; Melini, D.; Mitsou, V.A.; Monsonis Romero, L.; Moreno Llacer, M.; Munoz Perez, D.; Poveda, J.; Rubio Jimenez, A.; Ruiz-Martinez, A.; Saibel, A.; Salt, J.; Sanchez Sebastian, V.; Senthilkumar, V.; Soldevila, U.; Sanchez, J.; Taylor Vara, R.J.; Torro Pastor, E.; Valero, A.; Valiente Moreno, E.; Valls Ferrer, J.A.; Varriale, L.; Villaplana Perez, M.; Vincent, M.; Vos, M.; Wandall-Christensen, K.; Zakareishvili, T. |
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Title |
Observation of t(t)over-barγγ production at √s=13 TeV with the ATLAS detector |
Type |
Journal Article |
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Year |
2026 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
874 |
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Pages |
140195 - 19pp |
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Keywords |
Top-quark pair production in association with two photons |
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Abstract |
This paper presents the first observation of top-quark pair production in association with two photons (t (t) over bar gamma gamma). The measurement is performed in the single-lepton decay channel using proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider. The data correspond to an integrated luminosity of 140 fb(-1) recorded during Run 2 at a centre-of-mass energy of 13 TeV. The t (t) over bar gamma gamma production cross section, measured in a fiducial phase space based on particle-level kinematic criteria for the lepton, photons, and jets, is found to be 2.42(-0.53)(+0.58) fb, corresponding to an observed significance of 5.2 standard deviations. Additionally, the ratio of the production cross section of t (t) over bar gamma gamma. to top-quark pair production in association with one photon is determined, yielding (3.30(-0.65)(+0.70)) x 10(-3). |
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Address |
[Desai, A. M.; Fewell, M. P.; Gallagher, J.; Grant, C. M.; Green, M. J.; Jackson, P.; Kong, A. X. Y.; Kull, J.; Pandya, H. D.; Ruggeri, T. A.; Saha, S.; Ting, E. X. L.; White, M. J.] Univ Adelaide, Dept Phys, Adelaide, SA, Australia |
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Publisher |
Elsevier |
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Language |
English |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
0370-2693 |
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Conference |
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Notes |
WOS:001710126200001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7143 |
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