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Title
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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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Author
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Institution/Organisation
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CMS Collaboration
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Abstract
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| A 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. |
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Language
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English
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Source (journal)
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Physical review D / American Physical Society. - Ridge, N.Y., 2016, currens
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Publication
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Ridge, N.Y.
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American Physical Society
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2023
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ISSN
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2470-0029
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DOI
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10.1103/PHYSREVD.108.032008
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Volume/pages
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108
:3
(2023)
, p. 1-35
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Article Reference
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032008
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ISI
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001063259200001
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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