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Search for new phenomena using the invariant mass distribution of same-flavour opposite-sign dilepton pairs in events with missing transverse momentum in $\sqrt{s}=13$   $\text {Te}\text {V}$ pp collisions with the ATLAS detector

2018-08-06Journal article Open access
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dc.contributor.authorATLAS collaboration (2904 authors)
dc.contributor.authorAguilar Saavedra, Juan Antonio
dc.contributor.authorAmor Dos Santos, Susana Patricia
dc.contributor.authorAraque Espinosa, Juan Pedro
dc.contributor.authorCastro, Nuno Filipe
dc.contributor.authorConde Muino, Patricia
dc.contributor.authorDa Cunha Sargedas De Sousa, Mario Jose
dc.contributor.authorDias do vale, Tiago
dc.contributor.authorFaisca Rodrigues Pereira, Rui Miguel
dc.contributor.authorFiolhais, Miguel
dc.contributor.authorGalhardo, Bruno
dc.contributor.authorGomes, Agostinho
dc.contributor.authorGoncalo, Ricardo
dc.contributor.authorJorge, Pedro
dc.contributor.authorMachado Miguens, Joana
dc.contributor.authorMaio, Amelia
dc.contributor.authorManeira, Jose
dc.contributor.authorOleiro Seabra, Luis Filipe
dc.contributor.authorOnofre, Antonio
dc.contributor.authorCosta Batalha Pedro, Rute
dc.contributor.authorPereira Peixoto, Ana Paula
dc.contributor.authorSantos, Helena
dc.contributor.authorSaraiva, Joao
dc.contributor.authorSilva, Jose Manuel
dc.contributor.authorTavares Delgado, Ademar
dc.contributor.authorVeloso, Filipe
dc.contributor.authorWolters, Helmut
dc.date.accessioned2019-02-05T16:26:56Z
dc.date.available2019-02-05T16:26:56Z
dc.date.issued2018-08-06
dc.date.updated2019-02-05T16:26:56Z
dc.description.abstractA search for new phenomena in final states containing an $e^+e^-$ or $\mu ^+\mu ^-$ pair, jets, and large missing transverse momentum is presented. This analysis makes use of proton–proton collision data with an integrated luminosity of $36.1~\mathrm {fb}^{-1}$ , collected during 2015 and 2016 at a centre-of-mass energy $\sqrt{s} = 13~\hbox {TeV}$ with the ATLAS detector at the Large Hadron Collider. The search targets the pair production of supersymmetric coloured particles (squarks or gluinos) and their decays into final states containing an $e^+e^-$ or $\mu ^+\mu ^-$ pair and the lightest neutralino ( $\tilde{\chi }_1^0$ ) via one of two next-to-lightest neutralino ( $\tilde{\chi }_2^0$ ) decay mechanisms: $\tilde{\chi }_2^0 \rightarrow Z \tilde{\chi }_1^0$ , where the Z boson decays leptonically leading to a peak in the dilepton invariant mass distribution around the Z boson mass, and $\tilde{\chi }_2^0 \rightarrow \ell ^+\ell ^- \tilde{\chi }_1^0$ with no intermediate $\ell ^+\ell ^-$ resonance, yielding a kinematic endpoint in the dilepton invariant mass spectrum. The data are found to be consistent with the Standard Model expectation. Results are interpreted using simplified models, and exclude gluinos and squarks with masses as large as 1.85 and 1.3  $\text {Te}\text {V}$ at 95% confidence level, respectively.
dc.description.versionPeer Reviewed
dc.identifierEur.Phys.J. C78 (2018) 625 Eur. Phys. J. C 78 (2018) 625; DOI 10.1140/epjc/s10052-018-6081-9
dc.identifier.urihttp://dx.doi.org/10.1140/epjc/s10052-018-6081-9
dc.identifier.urihttp://hdl.handle.net/10400.26/27649
dc.language.isoeng
dc.titleSearch for new phenomena using the invariant mass distribution of same-flavour opposite-sign dilepton pairs in events with missing transverse momentum in $\sqrt{s}=13$   $\text {Te}\text {V}$ pp collisions with the ATLAS detector
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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