Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13, 8, 7 TeV with the ATLAS detector

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dc.contributor.authorAaboud, M
dc.contributor.authorAad, G
dc.contributor.authorAbbott, B
dc.contributor.authorAbdallah, J
dc.contributor.authorAbdinov, O
dc.contributor.authorAbeloos, B
dc.contributor.authorAbidi, S H
dc.contributor.authorAbouZeid, O S
dc.contributor.authorAbraham, N L
dc.contributor.authorAbramowicz, H
dc.contributor.authorAbreu, H
dc.contributor.authorAbreu, R
dc.contributor.authorAbulaiti, Y
dc.contributor.authorAcharya, B S
dc.contributor.authorAdachi, S
dc.contributor.authorAdamczyk, L
dc.contributor.authorAdams, D L
dc.contributor.authorAdelman, J
dc.contributor.authorAdye, T
dc.contributor.authorAffolder, A A
dc.contributor.authorAgatonovic-Jovin, T
dc.contributor.authorAgheorghiesei, C
dc.contributor.authorAguilar-Saavedra, J A
dc.contributor.authorAhlen, S P
dc.contributor.authorAhmadov, F
dc.contributor.authorAielli, G
dc.contributor.authorAkatsuka, S
dc.contributor.authorAkerstedt, H
dc.contributor.authorÅkesson, T P A
dc.contributor.authorAkimov, A V
dc.contributor.authorAlberghi, G L
dc.contributor.authorAlbert, J
dc.date.accessioned2021-10-08T07:08:13Z
dc.date.available2021-10-08T07:08:13Z
dc.date.issued2017
dc.description.abstractRatios of top-quark pair to Z-boson cross sections measured from protonproton 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 → ` +` − where ` = 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 lightquark sea for x < 0.02.
dc.identifier.apacitationAaboud, M., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., ... Albert, J. (2017). Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13, 8, 7 TeV with the ATLAS detector. <i>Journal of High Energy Physics</i>, 2017(2), 174 - 177. http://hdl.handle.net/11427/34526en_ZA
dc.identifier.chicagocitationAaboud, M, G Aad, B Abbott, J Abdallah, O Abdinov, B Abeloos, S H Abidi, et al "Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13, 8, 7 TeV with the ATLAS detector." <i>Journal of High Energy Physics</i> 2017, 2. (2017): 174 - 177. http://hdl.handle.net/11427/34526en_ZA
dc.identifier.citationAaboud, M., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., Abidi, S.H. & AbouZeid, O.S. et al. 2017. Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13, 8, 7 TeV with the ATLAS detector. <i>Journal of High Energy Physics.</i> 2017(2):174 - 177. http://hdl.handle.net/11427/34526en_ZA
dc.identifier.issn1029-8479
dc.identifier.issn1126-6708
dc.identifier.ris TY - Journal Article AU - Aaboud, M AU - Aad, G AU - Abbott, B AU - Abdallah, J AU - Abdinov, O AU - Abeloos, B AU - Abidi, S H AU - AbouZeid, O S AU - Abraham, N L AU - Abramowicz, H AU - Abreu, H AU - Abreu, R AU - Abulaiti, Y AU - Acharya, B S AU - Adachi, S AU - Adamczyk, L AU - Adams, D L AU - Adelman, J AU - Adye, T AU - Affolder, A A AU - Agatonovic-Jovin, T AU - Agheorghiesei, C AU - Aguilar-Saavedra, J A AU - Ahlen, S P AU - Ahmadov, F AU - Aielli, G AU - Akatsuka, S AU - Akerstedt, H AU - Åkesson, T P A AU - Akimov, A V AU - Alberghi, G L AU - Albert, J AB - Ratios of top-quark pair to Z-boson cross sections measured from protonproton 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 → ` +` − where ` = 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 lightquark sea for x < 0.02. DA - 2017 DB - OpenUCT DP - University of Cape Town IS - 2 J1 - Journal of High Energy Physics LK - https://open.uct.ac.za PY - 2017 SM - 1029-8479 SM - 1126-6708 T1 - Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13, 8, 7 TeV with the ATLAS detector TI - Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13, 8, 7 TeV with the ATLAS detector UR - http://hdl.handle.net/11427/34526 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34526
dc.identifier.vancouvercitationAaboud M, Aad G, Abbott B, Abdallah J, Abdinov O, Abeloos B, et al. Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13, 8, 7 TeV with the ATLAS detector. Journal of High Energy Physics. 2017;2017(2):174 - 177. http://hdl.handle.net/11427/34526.en_ZA
dc.publisher.departmentDepartment of Physics
dc.publisher.facultyFaculty of Science
dc.sourceJournal of High Energy Physics
dc.source.journalissue2
dc.source.journalvolume2017
dc.source.pagination174 - 177
dc.source.urihttps://dx.doi.org/10.1007/JHEP02(2017)117
dc.subject.otherScience &
dc.subject.otherTechnology
dc.subject.otherPhysical Sciences
dc.subject.otherPhysics
dc.subject.otherParticles &
dc.subject.otherFields
dc.subject.otherHadron-Hadron scattering (experiments)
dc.subject.otherPARTON DISTRIBUTIONS
dc.subject.otherHADRON COLLIDERS
dc.subject.otherQCD ANALYSIS
dc.subject.otherPLUS PLUS
dc.subject.otherRESUMMATION
dc.subject.otherDECAY
dc.subject.otherLHC
dc.titleMeasurements of top-quark pair to Z-boson cross-section ratios at √s = 13, 8, 7 TeV with the ATLAS detector
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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