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

G. Aad, B. Abbott, K. Abeling, N. J. Abicht, S. H. Abidi, A. Aboulhorma, H. Abramowicz, H. Abreu, Y. Abulaiti, B. S. Acharya, …
Physics letters. B, 卷.848, 138376
01/01/2024
DOI: https://doi.org/10.1016/j.physletb.2023.138376
Web of Science ID: WOS:001136441300001

摘要

Astronomy & Astrophysics Physical Sciences Physics Physics, Nuclear Physics, Particles & Fields Science & Technology
The inclusive top-quark-pair production cross section rrtt and its ratio to the Z-boson production cross section have been measured in proton-proton collisions at root 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 rrtt = 850 +/- 3(stat.) +/- 18(syst.) +/- 20(lumi.) pb. The ratio of the ttand the Z-boson production cross sections is also measured, where the Z-boson contribution is determined for inclusive e+e- and mu+mu- events in a fiducial phase space. The relative uncertainty on the ratio is reduced compared to the ttcross section, thanks to the cancellation of several systematic uncertainties. The result for the ratio, Rtt/Z = 1.145 +/- 0.003(stat.) +/- 0.021(syst.) +/- 0.002(lumi.) is consistent with the Standard Model prediction using the PDF4LHC21 PDF set.

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