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Search for dark matter produced in association with bottom or top quarks in $\sqrt{s}=13$ TeV pp collisions with the ATLAS detector

2018-01-11Journal article Open access
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dc.contributor.authorATLAS collaboration (2902 authors)
dc.contributor.authorAguilar-Saavedra, Juan Antonio
dc.contributor.authorAmor Dos Santos, Susana Patricia
dc.contributor.authorAnjos, Nuno
dc.contributor.authorAraque, Juan Pedro
dc.contributor.authorCastro, Nuno Filipe
dc.contributor.authorConde Muiño, Patricia
dc.contributor.authorDa Cunha Sargedas De Sousa, Mario Jose
dc.contributor.authorFiolhais, Miguel
dc.contributor.authorGalhardo, Bruno
dc.contributor.authorGomes, Agostinho
dc.contributor.authorGonçalo, Ricardo
dc.contributor.authorJorge, Pedro
dc.contributor.authorMachado Miguens, Joana
dc.contributor.authorMaio, Amélia
dc.contributor.authorManeira, José
dc.contributor.authorOleiro Seabra, Luis Filipe
dc.contributor.authorOnofre, António
dc.contributor.authorPedro, Rute
dc.contributor.authorSantos, Helena
dc.contributor.authorSaraiva, João
dc.contributor.authorSilva, José
dc.contributor.authorTavares Delgado, Ademar
dc.contributor.authorVeloso, Filipe
dc.contributor.authorWolters, Helmut
dc.date.accessioned2019-02-05T15:24:14Z
dc.date.available2019-02-05T15:24:14Z
dc.date.issued2018-01-11
dc.date.updated2019-02-05T15:24:14Z
dc.description.abstractA 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 $36.1 \, \mathrm {fb}^{-1}$ of proton–proton collision data recorded by the ATLAS experiment at $\sqrt{s}=13$  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 $50\, \hbox {GeV}$ and assuming a dark-matter mass of $1 \,\hbox {GeV}$ and unitary coupling. Constraints on colour-charged scalar simplified models are also presented. Assuming a dark-matter particle mass of $35\, \hbox {GeV}$ , mediator particles with mass below $1.1\, \hbox {TeV}$ are excluded for couplings yielding a dark-matter relic density consistent with measurements.
dc.description.versionPeer Reviewed
dc.identifierEur.Phys.J. C78 (2018) 18 Eur. Phys. J. C 78 (2018) 18; DOI 10.1140/epjc/s10052-017-5486-1
dc.identifier.urihttp://dx.doi.org/10.1140/epjc/s10052-017-5486-1
dc.identifier.urihttp://hdl.handle.net/10400.26/27491
dc.language.isoeng
dc.titleSearch for dark matter produced in association with bottom or top quarks in $\sqrt{s}=13$ TeV pp collisions with the ATLAS detector
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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