Guerrieri, G. (2024) Measurement of tt¯ and Z-boson cross sections and their ratio using pp collisions at s√=13.6 TeV with the ATLAS detector. Il nuovo cimento C, 47 (3). pp. 1-6. ISSN 1826-9885
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Abstract
The inclusive top-quark-pair production cross-section O¯ tt¯ the fiducial Z-boson production cross-section O¯ fid. Z—> ll, and their ratio are measured in the dilepton channel by the ATLAS collaboration using proton–proton collisions at the centre-of-mass energy of 13.6 TeV, employing 11.3 fb¯ 1 of data collected in 2022 at the Large Hadron Collider. The top-quark-pair production cross-section is measured using events with an opposite-charge electron-muon pair and b-tagged jets, and corresponds to O¯ tt¯ = 859 # 4 (stat.) # 22 (sys.) # 19 (lumi.) pb. The Z-boson production cross-section is measured using e+e- and u+u- final state in a fiducial phase space: O¯ fid. Z—> ll = 751 # 0.3 (stat.) # 15 (syst.) # 17 (lumi.) pb. Finally, the ratio of the tt¯ and the Z-boson production cross-sections is measured, benefiting from cancellation of several systematic uncertainties. The result for the ratio, R tt¯ /Z = 1.144 # 0.006 (stat.) # 0.0022 (syst.) # 0.003 (lumi.) is consistent with the Standard Model prediction using the PDF4LHC21 PDF set.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 07 Jun 2024 14:20 |
| Last Modified: | 07 Jun 2024 14:20 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/22954 |
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