Details

Autor(en) / Beteiligte

• Aad, G.
• Andrean, Stefio Y.
• Backman, Filip
• Barranco Navarro, Laura
• Bohm, Christian
• Clément, Christophe
• Dunne, Katherine
• Hellman, Sten
• Ingebretsen Carlson, Tom
• Kim, Dongwon
• Lee, Suhyun
• Lou, Xuanhong
• Milstead, David A.
• Pasuwan, Patrawan
• Pereira Sanchez, Laura
• Richter, Stefan
• Riefel, Ellen Maria
• Silverstein, Samuel B.
• Sjölin, Jörgen
• Strandberg, Sara
• Strübig, Antonia
• Valdés Santurio, Eduardo
• Zwalinski, L.

Titel

Measurement of the t ̄ t ̄ cross section and its ratio to the Z production cross section using pp collisions at √ s =13.6 TeV with the ATLAS detector

Ist Teil von

• Physics letters. B, 2024, Vol.848

Erscheinungsjahr

2024

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The inclusive top-quark-pair production cross section σ tt̄ and its ratio to the Z-boson production cross section have been measured in proton–proton collisions at √s = 13.6 TeV, using 29 fb −1 of data collected in 2022 with the ATLAS experiment at the Large Hadron Collider. Using events with an opposite-charge electron-muon pair and b-tagged jets, and assuming Standard Model decays, the top-quark-pair production cross section is measured to be σ tt̄ = 850± 3(stat.) ± 18(syst.) ± 20(lumi.) pb. The ratio of the tt̄ and the Z-boson production cross sections is also measured, where the Z-boson contribution is determined for inclusive e + e − and μ + μ − events in a fiducial phase space. The relative uncertainty on the ratio is reduced compared to the tt̄ cross section, thanks to the cancellation of several systematic uncertainties. The result for the ratio, R tt̄∕Z = 1.145 ± 0.003(stat.) ± 0.021(syst.)±0.002(lumi.) is consistent with the Standard Model prediction using the PDF4LHC21 PDF set.