Salvatore, Fabrizio, DeSanto, Antonella, Vivarelli, Iacopo, Cerri, Alessandro, Asquith, Lily, Allbrooke, Benedict, Suruliz, Kerim, Sutton, Mark, Chavez Barajas, Carlos and The ATLAS Collaboration, (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). a18 1-36. 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:	12 Aug 2020 09:45
URI:	http://sro.sussex.ac.uk/id/eprint/72313

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