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

Salvatore, Fabrizio, DeSanto, Antonella, Vivarelli, Iacopo, Cerri, Alessandro, Asquith, Lily, Allbrooke, Benedict, Suruliz, Kerim, Sutton, Mark and Chavez Barajas, Carlos (2017) 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 (18). ISSN 1434-6044

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Abstract

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−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 in- terpreted 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 50 GeV 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: Article
Keywords: LHC, ATLAS, SUSY Dark Matter
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Experimental Particle Physics Research Group
Subjects: Q Science > QC Physics > QC0770 Nuclear and particle physics. Atomic energy. Radioactivity > QC0793 Elementary particle physics
Depositing User: Fabrizio Salvatore
Date Deposited: 19 Dec 2017 11:28
Last Modified: 18 Jan 2018 13:22
URI: http://sro.sussex.ac.uk/id/eprint/72313

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