@Article{ATLASCollaborationAaboud_etal2017,
author="ATLAS Collaboration (Aaboud, M. et al
and Alvarez Piqueras, D.
and Barranco Navarro, L.
and Cabrera Urban, S.
and Castillo Gimenez, V.
and Cerda Alberich, L.
and Costa, M. J.
and Fernandez Martinez, P.
and Ferrer, A.
and Fiorini, L.
and Fuster, J.
and Garcia, C.
and Garcia Navarro, J. E.
and Gonzalez de la Hoz, S.
and Higon-Rodriguez, E.
and Jimenez Pena, J.
and Lacasta, C.
and Mamuzic, J.
and Marti-Garcia, S.
and Melini, D.
and Mitsou, V. A.
and Pedraza Lopez, S.
and Rodriguez Rodriguez, D.
and Romero Adam, E.
and Ros, E.
and Salt, J.
and Sanchez Martinez, V.
and Soldevila, U.
and Sanchez, J.
and Valero, A.
and Valls Ferrer, J. A.
and Vos, M.",
title="Measurements of top-quark pair to Z-boson cross-section ratios at root s=13, 8, 7 TeV with the ATLAS detector",
journal="Journal of High Energy Physics",
year="2017",
publisher="Springer",
volume="02",
number="2",
pages="117--54pp",
optkeywords="Hadron-Hadron scattering (experiments)",
abstract="Ratios of top-quark pair to Z-boson cross sections measured from proton-proton-collisions at the LHC centre-of-mass energies of root S = 13 TeV, 8 TeV, and 7 TeV are presented by the ATLAS Collaboration. Single ratios, at a given root S for the two processes and at different root S , for each process, as well as double ratios of the two processes at different root S , are evaluated. The ratios are constructed using previously published ATLAS measurements of the t (t) over bar 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, $\mu$at root 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 -> $\mu$(+) $\mu$(-) channels for each 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.",
optnote="WOS:000395022700001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3014), last updated on Fri, 07 Apr 2017 11:30:01 +0000",
issn="1029-8479",
doi="10.1007/JHEP02(2017)117",
opturl="http://arxiv.org/abs/1612.03636",
opturl="https://doi.org/10.1007/JHEP02(2017)117",
archivePrefix="arXiv",
eprint="1612.03636",
language="English"
}