Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment

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dc.contributor.authorAad, G
dc.contributor.authorAbbott, B
dc.contributor.authorAbdallah, J
dc.contributor.authorAbdinov, O
dc.contributor.authorAbeloos, B
dc.contributor.authorAben, R
dc.contributor.authorAbolins, M
dc.contributor.authorAbouZeid, O S
dc.contributor.authorAbramowicz, H
dc.contributor.authorAbreu, H
dc.contributor.authorAbreu, R
dc.contributor.authorAbulaiti, Y
dc.contributor.authorAcharya, B S
dc.contributor.authorAdamczyk, L
dc.contributor.authorAdams, D L
dc.contributor.authorAdelman, J
dc.contributor.authorAdomeit, S
dc.contributor.authorAdye, T
dc.contributor.authorAffolder, A A
dc.contributor.authorAgatonovic-Jovin, T
dc.contributor.authorAgricola, J
dc.contributor.authorAguilar-Saavedra, J A
dc.contributor.authorAhlen, S P
dc.contributor.authorAhmadov, F
dc.contributor.authorAielli, G
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.contributor.authorAlbrand, S
dc.contributor.authorAlconada Verzini, M J
dc.date.accessioned2021-10-08T07:11:48Z
dc.date.available2021-10-08T07:11:48Z
dc.date.issued2016
dc.description.abstractIn the pp → tt¯ process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the charge asymmetry in events where the top-quark pair is produced with a large invariant mass. The analysis is performed on 20.3 fb−1 of pp collision data at √s = 8 TeV collected by the ATLAS experiment at the LHC, using reconstruction techniques specifically designed for the decay topology of highly boosted top quarks. The charge asymmetry in a fiducial region with large invariant mass of the top-quark pair (mtt¯ > 0.75 TeV) and an absolute rapidity difference of the top and anti-top quark candidates within −2 < |yt| − |yt¯| < 2 is measured to be 4.2 ± 3.2%, in agreement with the Standard Model prediction at next-to-leading order. A differential measurement in three tt¯ mass bins is also presented.
dc.identifier.apacitationAad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., Aben, R., ... Alconada Verzini, M. J. (2016). Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment. <i>Physics Letters, B</i>, 756(C), 52 - 71. http://hdl.handle.net/11427/34688en_ZA
dc.identifier.chicagocitationAad, G, B Abbott, J Abdallah, O Abdinov, B Abeloos, R Aben, M Abolins, et al "Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment." <i>Physics Letters, B</i> 756, C. (2016): 52 - 71. http://hdl.handle.net/11427/34688en_ZA
dc.identifier.citationAad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., Aben, R., Abolins, M. & AbouZeid, O.S. et al. 2016. Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment. <i>Physics Letters, B.</i> 756(C):52 - 71. http://hdl.handle.net/11427/34688en_ZA
dc.identifier.issn0370-2693
dc.identifier.issn1873-2445
dc.identifier.ris TY - Journal Article AU - Aad, G AU - Abbott, B AU - Abdallah, J AU - Abdinov, O AU - Abeloos, B AU - Aben, R AU - Abolins, M AU - AbouZeid, O S AU - Abramowicz, H AU - Abreu, H AU - Abreu, R AU - Abulaiti, Y AU - Acharya, B S AU - Adamczyk, L AU - Adams, D L AU - Adelman, J AU - Adomeit, S AU - Adye, T AU - Affolder, A A AU - Agatonovic-Jovin, T AU - Agricola, J AU - Aguilar-Saavedra, J A AU - Ahlen, S P AU - Ahmadov, F AU - Aielli, G AU - Akerstedt, H AU - Åkesson, T P A AU - Akimov, A V AU - Alberghi, G L AU - Albert, J AU - Albrand, S AU - Alconada Verzini, M J AB - In the pp → tt¯ process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the charge asymmetry in events where the top-quark pair is produced with a large invariant mass. The analysis is performed on 20.3 fb−1 of pp collision data at √s = 8 TeV collected by the ATLAS experiment at the LHC, using reconstruction techniques specifically designed for the decay topology of highly boosted top quarks. The charge asymmetry in a fiducial region with large invariant mass of the top-quark pair (mtt¯ > 0.75 TeV) and an absolute rapidity difference of the top and anti-top quark candidates within −2 < |yt| − |yt¯| < 2 is measured to be 4.2 ± 3.2%, in agreement with the Standard Model prediction at next-to-leading order. A differential measurement in three tt¯ mass bins is also presented. DA - 2016 DB - OpenUCT DP - University of Cape Town IS - C J1 - Physics Letters, B LK - https://open.uct.ac.za PY - 2016 SM - 0370-2693 SM - 1873-2445 T1 - Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment TI - Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment UR - http://hdl.handle.net/11427/34688 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34688
dc.identifier.vancouvercitationAad G, Abbott B, Abdallah J, Abdinov O, Abeloos B, Aben R, et al. Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment. Physics Letters, B. 2016;756(C):52 - 71. http://hdl.handle.net/11427/34688.en_ZA
dc.publisher.departmentDepartment of Physics
dc.publisher.facultyFaculty of Science
dc.sourcePhysics Letters, B
dc.source.journalissueC
dc.source.journalvolume756
dc.source.pagination52 - 71
dc.source.urihttps://dx.doi.org/10.1016/j.physletb.2016.02.055
dc.subject.otherscattering [p p]
dc.subject.otherSubatomic Physics
dc.subject.otherasymmetry: measured [charge]
dc.subject.otherATLAS
dc.subject.otherParticle Physics - Experiment
dc.subject.othermass dependence
dc.subject.otherAsymmetry
dc.subject.othermass [top]
dc.subject.other530
dc.subject.otherQC
dc.subject.otherSettore ING-INF/07 - Misure Elettriche e Elettroniche
dc.subject.otherasymmetry [charge]
dc.subject.otherPhysics
dc.subject.otherHigh Energy Physics - Experiment
dc.subject.otherCERN LHC Coll
dc.subject.otherATLAS experiment
dc.subject.othercharge asymmetry
dc.subject.other(2top) [mass spectrum]
dc.subject.otherNuclear and High Energy Physics
dc.subject.otherdifference [rapidity]
dc.subject.other8000 GeV-cms
dc.subject.otherexperimental results
dc.subject.otherSubatomär fysik
dc.subject.othertopology
dc.subject.otherangular distribution [top]
dc.titleMeasurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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