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effective field theory in 13 TeV pp collision events that contain a top quark pair and a boosted Z or Higgs boson. In: Physical Review D, 108 (3).
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Abstract
A data sample containing top quark pairs ( t t ¯ ) 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 t t ¯ Z or t t ¯ H events and events from background processes, which are dominated by t t ¯ + jets production. No indications of new physics are observed. The signal strengths of boosted t t ¯ Z and t t ¯ H production are measured, and upper limits are placed on the t t ¯ Z and t t ¯ 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. © 2023 CERN, for the CMS Collaboration.
| Item Type: | Journal Article |
|---|---|
| Publication: | Physical Review D |
| Publisher: | American Physical Society |
| Additional Information: | The Copyright for this article belongs to the authors. |
| Department/Centre: | Division of Physical & Mathematical Sciences > Centre for High Energy Physics |
| Date Deposited: | 17 Dec 2023 09:03 |
| Last Modified: | 17 Dec 2023 09:03 |
| URI: | https://eprints.iisc.ac.in/id/eprint/83449 |
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