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Measurements of top-quark pair to Z-boson cross-section ratios at √s =13 , 8, 7 TeV with the ATLAS detector
ATLAS Collaboration
ATLAS Collaboration
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Abstract
Ratios of top-quark pair to Z-boson cross sections measured from proton-proton collisions at the LHC centre-of-mass energies of s√=13 TeV, 8 TeV, and 7 TeV are presented by the ATLAS Collaboration. Single ratios, at a given s√ for the two processes and at different s√ for each process, as well as double ratios of the two processes at different s√, are evaluated. The ratios are constructed using previously published ATLAS measurements of the tt¯ and Z-boson production cross sections, corrected to a common phase space where required, and a new analysis of Z → ℓ+ℓ− where ℓ = e, μ at s√=13 TeV performed with data collected in 2015 with an integrated luminosity of 3.2 fb−1. Correlations of systematic uncertainties are taken into account when evaluating the uncertainties in the ratios. The correlation model is also used to evaluate the combined cross section of the Z → e + e − and the Z → μ + μ − channels for each s√ value. The results are compared to calculations performed at next-to-next-to-leading-order accuracy using recent sets of parton distribution functions. The data demonstrate significant power to constrain the gluon distribution function for the Bjorken-x values near 0.1 and the light-quark sea for x < 0.02.
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2017-02-23
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Springer Verlag
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ATLAS_Collab_2017.pdf
Adobe PDF, 2.39 MB
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Hadron-Hadron scattering (experiments)
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The ATLAS collaboration, Aaboud, M., Aad, G. et al. J. High Energ. Phys. (2017) 2017: 117. https://doi.org/10.1007/JHEP02(2017)117