Details

Autor(en) / Beteiligte

• Ai, X.
• Alviggi, M.G.
• Anisenkov, A.V.
• Badea, A.
• Balz, J.
• Bartels, F.
• Bernlochner, F.U.
• Biebel, O.
• Bisanz, T.
• Bloch, I.
• Boudreau, J.
• Bruni, A.
• Caron, S.
• Chen, S.
• Chen, S.J.
• Ciubotaru, D.A.
• Clement, C.
• Daneri, M.F.
• De la Torre, H.
• Drivas-koulouris, I.
• Drobac, A.S.
• Elliot, A.A.
• Epari, S.
• Fassouliotis, D.
• Fawcett, W.J.
• Feng, Z.
• Ferrari, P.
• Fournier, D.
• Gan, K.K.
• Garcia-Sciveres, M.
• Gilbert, A.K.
• Giraud, P.F.
• Guo, Y.
• Hadzic, S.
• Hangal, D.A.
• Heidorn, W.D.
• Ilg, A.
• Jejelava, J.
• Kagan, H.
• Kartvelishvili, V.
• Kehris, G.V.
• Khandoga, M.
• Kirk, J.
• Kono, T.
• Kopeliansky, R.
• Krivos, M.
• Krizka, K.
• Kuhl, T.
• Landgraf, U.
• Lantzsch, K.
• Leigh, M.
• Leight, W.A.
• Lindon, J.H.
• Mandić, I.
• Martyniuk, A.C.
• Mckenzie, R.P.
• Merola, L.
• Mineev, M.
• Mironova, M.
• Mondal, S.
• Moreira De Carvalho, A.L.
• Moreno Llácer, M.
• Mosidze, M.
• Nommensen, T.
• Novak, J.
• Nozka, L.
• Pauly, T.
• Pender, E.A.
• Pham, T.
• Pinheiro Pereira, B.C.
• Pleskot, V.
• Rieck, P.
• Rimoldi, A.
• Rocchi, A.
• Ruelas Rivera, V.H.
• Sbarra, C.
• Sebastiani, C.D.
• Skorda, E.
• Smolek, K.
• Solovieva, K.
• Sopkova, F.
• Soumaimi, Z.
• Stelzer, B.
• Strom, L.R.
• Sun, S.
• Sunneborn Gudnadottir, O.
• Taffard, A.
• Thomson, E.
• Vacavant, L.
• Vacek, V.
• Vandewall, E.R.
• Viaux Maira, N.
• Vozak, M.
• Vranjes Milosavljevic, M.
• Wang, X.
• Wang, Y.
• Wells, C.J.
• Wengler, T.
• Wessels, M.
• Zhang, X.

Titel

Evidence of off-shell Higgs boson production from ZZ leptonic decay channels and constraints on its total width with the ATLAS detector

Ist Teil von

• Physics letters. B, 2023, Vol.846, Article 138223

Ort / Verlag

United States: Elsevier B.V

Erscheinungsjahr

2023

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• This Letter reports on a search for off-shell production of the Higgs boson using 139 fb−1 of pp collision data at s= 13 TeV collected by the ATLAS detector at the Large Hadron Collider. The signature is a pair of Z bosons, with contributions from both the production and subsequent decay of a virtual Higgs boson and the interference of that process with other processes. The two observable final states are ZZ→4ℓ and ZZ→2ℓ2ν with ℓ=e or μ. In the ZZ→4ℓ final state, a dense Neural Network is used to enhance analysis sensitivity with respect to matrix element-based discrimination. The background-only hypothesis is rejected with an observed (expected) significance of 3.3 (2.2) standard deviations, representing experimental evidence for off-shell Higgs boson production. Assuming that no new particles enter the production of the virtual Higgs boson, its total width can be deduced from the measurement of its off-shell production cross-section. The measured total width of the Higgs boson is 4.5−2.5+3.3 MeV, and the observed (expected) upper limit on the total width is found to be 10.5 (10.9) MeV at 95% confidence level.