10.1007-JHEP02(2017)117.pdf (2.39 MB)
Measurements of top-quark pair to Z-boson cross-section ratios at vs =13, 8, 7 TeV with the ATLAS detector
journal contribution
posted on 2023-06-09, 07:12 authored by Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, C A Chavez Barajas, Antonella De SantoAntonella De Santo, Fabrizio SalvatoreFabrizio Salvatore, I Santoyo Castillo, K Suruliz, Mark SuttonMark Sutton, Iacopo Vivarelli, The ATLAS CollaborationRatios of top-quark pair to Z-boson cross sections measured from proton-proton collisions at the LHC centre-of-mass energies of sv=13TeV, 8TeV, and 7TeV are presented by the ATLAS Collaboration. Single ratios, at a given vs for the two processes and at different vs for each process, as well as double ratios of the two processes at different vs , 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 sv=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 vs 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.
Funding
ATLAS; G0275; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I006048/1
History
Publication status
- Published
File Version
- Published version
Journal
Journal of High Energy PhysicsISSN
1126-6708Publisher
Springer VerlagExternal DOI
Issue
2Volume
2017Article number
a117Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Experimental Particle Physics Research Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2017-07-13First Open Access (FOA) Date
2017-07-13First Compliant Deposit (FCD) Date
2017-07-13Usage metrics
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