2017/10/31 by ATLAS Collaboration, M. Aaboud, G. Aad +98
Medicine · Physics and Astronomy · #Atlas (anatomy) #Atlas detector #Computer science #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Large Hadron Collider #Medicine #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quark #Top quark #Top-down and bottom-up design #hep-ex
paper · pdf · doi:10.1140/epjc/s10052-017-5486-1
published as Eur. Phys. J. C 78 (2018) 18 · 52 pages in total, author list starting page 36, 8 figures, 9 tables, submitted to EPJC, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2016-18/
openalex created_date 2017/11/17 · openalex publication_date 2018/01/01 · arxiv created 2018/01/19 · arxiv updated 2018/01/22 · openalex updated_date 2026/08/06
A search for weakly interacting massive darkmatter 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 36.1 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 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 darkmatter 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.