@misc{10481/95922,
year = {2017},
month = {2},
url = {https://hdl.handle.net/10481/95922},
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 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 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.},
organization = {CERN},
organization = {MINECO},
organization = {EPLANET},
organization = {ERC},
organization = {ERDF},
organization = {FP7},
organization = {Horizon 2020},
organization = {Marie Skłodowska-Curie Actions},
organization = {CERCA Programme Generalitat de Catalunya},
organization = {Generalitat Valenciana},
publisher = {Springer Nature},
keywords = {Hadron-Hadron scattering (experiments)},
title = {Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13, 8, 7 TeV with the ATLAS detector},
doi = {10.1007/JHEP02(2017)117},
author = {Aaboud, M. and Aguilar Saavedra, Juan Antonio and Atlas Collaboration, /},
}