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Search for Dark Matter Particles Produced in Association with a Top Quark Pair at $\sqrt {s} = 13$ TeV


Abstract

A search is performed for dark matter particles produced in association with a top quark pair in proton-proton collisions at $\sqrt {s} = 13$ TeV. The data correspond to an integrated luminosity of 35.9  $fb^{−1}$ recorded by the CMS detector at the LHC. No significant excess over the standard model expectation is observed. The results are interpreted using simplified models of dark matter production via spin-0 mediators that couple to dark matter particles and to standard model quarks, providing constraints on the coupling strength between the mediator and the quarks. These are the most stringent collider limits to date for scalar mediators, and the most stringent for pseudoscalar mediators at low masses.

Abstract

A search is performed for dark matter particles produced in association with a top quark pair in proton-proton collisions at $\sqrt {s} = 13$ TeV. The data correspond to an integrated luminosity of 35.9  $fb^{−1}$ recorded by the CMS detector at the LHC. No significant excess over the standard model expectation is observed. The results are interpreted using simplified models of dark matter production via spin-0 mediators that couple to dark matter particles and to standard model quarks, providing constraints on the coupling strength between the mediator and the quarks. These are the most stringent collider limits to date for scalar mediators, and the most stringent for pseudoscalar mediators at low masses.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2019
Deposited On:09 Jan 2020 08:53
Last Modified:18 Feb 2020 11:02
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Green
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/PhysRevLett.122.011803

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