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Search for dark matter produced in association with bottom or top quarks in √s=13 TeV pp collisions with the ATLAS detector

Barton, Adam Edward and Beattie, Michael and Bertram, Iain Alexander and Borissov, Guennadi and Bouhova-Thacker, Evelina Vassileva and Fox, Harald and Grimm, Kathryn Ann Tschann and Henderson, Robert Charles William and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin Eamonn and Love, Peter Allan and Muenstermann, Daniel Matthias Alfred and Parker, Adam Jackson and Skinner, Malcolm and Smizanska, Maria and Walder, James William and Wharton, Andy and Whitmore, Ben (2018) Search for dark matter produced in association with bottom or top quarks in √s=13 TeV pp collisions with the ATLAS detector. European Physical Journal C: Particles and Fields, 78 (1). ISSN 1434-6044

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Abstract

A search for weakly interacting massive dark-matter particles produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and missing transverse momentum are considered. The analysis uses 36.1fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s=13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are interpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour-neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross-section of 300 times the predicted rate for mediators with masses between 10 and 50GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour-charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV , mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements.

Item Type: Journal Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 124107
Deposited By: ep_importer_pure
Deposited On: 19 Mar 2018 12:32
Refereed?: Yes
Published?: Published
Last Modified: 05 Dec 2018 03:35
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/124107

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