Search for new physics using effective field theory in 13 TeV pp collision events that contain a top quark pair and a boosted Z or Higgs boson

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dc.contributor.authorTumasyan, A.
dc.contributor.authorAdam, W.
dc.contributor.authorAndrejkovic, J. W.
dc.contributor.authorBergauer, T.
dc.contributor.authorChatterjee, S.
dc.contributor.authorDamanakis, K.
dc.contributor.authorDragicevic, M.
dc.date.accessioned2024-06-13T20:18:14Z
dc.date.available2024-06-13T20:18:14Z
dc.date.issued2023
dc.departmentİstanbul Gedik Üniversitesi
dc.description.abstractA data sample containing top quark pairs (tt over bar ) produced in association with a Lorentz-boosted Z or Higgs boson is used to search for signs of new physics using effective field theory. The data correspond to an integrated luminosity of 138 fb-1 of proton-proton collisions produced at a center-of-mass energy of 13 TeV at the LHC and collected by the CMS experiment. Selected events contain a single lepton and hadronic jets, including two identified with the decay of bottom quarks, plus an additional large-radius jet with high transverse momentum identified as a Z or Higgs boson decaying to a bottom quark pair. Machine learning techniques are employed to discriminate between tt over bar Z or tt over bar H events and events from background processes, which are dominated by tt over bar + jets production. No indications of new physics are observed. The signal strengths of boosted tt over bar Z and tt over bar H production are measured, and upper limits are placed on the tt over bar Z and tt over bar H differential cross sections as functions of the Z or Higgs boson transverse momentum. The effects of new physics are probed using a framework in which the standard model is considered to be the low-energy effective field theory of a higher energy scale theory. Eight possible dimension-six operators are added to the standard model Lagrangian, and their corresponding coefficients are constrained via fits to the data.
dc.description.sponsorshipMunicipal Science amp; Technology Commission [2288]; Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; Hellenic Foundation for Research and Innovation (HFRI) [EXC 2121]; Deutsche Forschungsgemeinschaft (DFG) [390833306, 400140256GRK2497, K 124845]; Hungarian Academy of Sciences; NKFIH Research Grants [K 124850, K 128713, K 128786, K 129058, K 131991, K 133046, K 138136, K 143460, K 143477, 2020-2.2.1-ED-2021-00181, TKP2021-NKTA-64, 2022/WK/14]; Council of Science and Industrial Research, India; Latvian Council of Science; Ministry of Education and Science [2021/41/B/ST2/01369]; National Science Center; Opus [2021/43/B/ST2/01552, CEECIND/01334/2018, MCIN/AEI/10.13039/501100011033]; National Priorities Research Program by Qatar National Research Fund [MDM-2017-0765]; ERDF a way of making Europe [B05F650021]; Programa Severo Ochoa del Principado de Asturias (Spain); Chulalongkorn Academic into Its 2nd Century Project Advancement Project; National Science, Research and Innovation Fund via the Program Management Unit for Human Resources amp; Institutional Development, Research and Innovation [C-1845]; Kavli Foundation; Nvidia Corporation; SuperMicro Corporation; Welch Foundation; Weston Havens Foundation (USA)
dc.identifier.doi10.1103/PhysRevD.108.032008
dc.identifier.issn2470-0010
dc.identifier.issn2470-0029
dc.identifier.issue3
dc.identifier.scopus2-s2.0-85174048476
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1103/PhysRevD.108.032008
dc.identifier.urihttps://hdl.handle.net/11501/1272
dc.identifier.volume108
dc.identifier.wosWOS:001063259200001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.ispartofPhysical Review D
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectHiggs Boson
dc.subject13 TeV
dc.subjectTop Quark Pair
dc.titleSearch for new physics using effective field theory in 13 TeV pp collision events that contain a top quark pair and a boosted Z or Higgs boson
dc.typeArticle

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