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Search for invisible particles produced in association with single-top-quarks in proton-proton collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector

2015-02-18Journal article Open access
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dc.contributor.authorATLAS collaboration (2879 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.authorCantrill, Robert
dc.contributor.authorCarvalho, João
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.authorLopes, Lourenco
dc.contributor.authorMachado Miguens, Joana
dc.contributor.authorMaio, Amélia
dc.contributor.authorManeira, José
dc.contributor.authorOnofre, António
dc.contributor.authorPalma, Alberto
dc.contributor.authorPedro, Rute
dc.contributor.authorPina, João Antonio
dc.contributor.authorPinto, Belmiro
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.accessioned2019-02-04T05:15:19Z
dc.date.available2019-02-04T05:15:19Z
dc.date.issued2015-02-18
dc.date.updated2019-02-04T05:15:19Z
dc.description.abstractA search for the production of single-top-quarks in association with missing energy is performed in proton–proton collisions at a centre-of-mass energy of $\sqrt{s}=\mathrm {8~TeV}$ with the ATLAS experiment at the large hadron collider using data collected in 2012, corresponding to an integrated luminosity of $20.3$  fb$^{-1}$ . In this search, the $W$ boson from the top quark is required to decay into an electron or a muon and a neutrino. No deviation from the standard model prediction is observed, and upper limits are set on the production cross-section for resonant and non-resonant production of an invisible exotic state in association with a right-handed top quark. In the case of resonant production, for a spin- $0$ resonance with a mass of $500$  GeV, an effective coupling strength above $0.15$ is excluded at 95 $\,\%$ confidence level for the top quark and an invisible spin- $1/2$ state with mass between $0$ and $100$  GeV. In the case of non-resonant production, an effective coupling strength above $0.2$ is excluded at 95 $\,\%$ confidence level for the top quark and an invisible spin- $1$ state with mass between $0$ and $657$  GeV.
dc.description.versionPeer Reviewed
dc.identifierEur.Phys.J. C75 (2015) 79; DOI 10.1140/epjc/s10052-014-3233-4
dc.identifier.urihttp://dx.doi.org/10.1140/epjc/s10052-014-3233-4
dc.identifier.urihttp://hdl.handle.net/10400.26/26710
dc.language.isoeng
dc.titleSearch for invisible particles produced in association with single-top-quarks in proton-proton collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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