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Search for dark matter and unparticles produced in association with a Z boson in proton-proton collisions at $\sqrt s=$ 8  TeV

dc.contributor.authorCMS collaboration (2300 authors)
dc.contributor.authorHollar, Jonathan
dc.contributor.authorCalpas, Betty
dc.contributor.authorNayak, Aruna
dc.contributor.authorBargassa, Pedrame
dc.contributor.authorBeirão Da Cruz E Silva, Cristóvão
dc.contributor.authorDi Francesco, Agostino
dc.contributor.authorFaccioli, Pietro
dc.contributor.authorFerreira Parracho, Pedro Guilherme
dc.contributor.authorGallinaro, Michele
dc.contributor.authorLeonardo, Nuno
dc.contributor.authorLloret Iglesias, Lara
dc.contributor.authorNguyen, Federico
dc.contributor.authorRodrigues Antunes, Joao
dc.contributor.authorSeixas, Joao
dc.contributor.authorToldaiev, Oleksii
dc.contributor.authorVadruccio, Daniele
dc.contributor.authorVarela, Joao
dc.contributor.authorVischia, Pietro
dc.contributor.authorDavid Tinoco Mendes, Andre
dc.contributor.authorSilva, Pedro
dc.contributor.authorMusella, Pasquale
dc.contributor.authorPela, Joao
dc.date.accessioned2019-02-04T08:40:34Z
dc.date.available2019-02-04T08:40:34Z
dc.date.issued2016-03-22
dc.date.updated2019-02-04T08:40:34Z
dc.description.abstractA search for evidence of particle dark matter (DM) and unparticle production at the LHC has been performed using events containing two charged leptons, consistent with the decay of a Z boson, and large missing transverse momentum. This study is based on data collected with the CMS detector corresponding to an integrated luminosity of 19.7  fb−1 of pp collisions at the LHC at a center-of-mass energy of 8 TeV. No significant excess of events is observed above the number expected from the standard model contributions. The results are interpreted in terms of 90% confidence level limits on the DM-nucleon scattering cross section, as a function of the DM particle mass, for both spin-dependent and spin-independent scenarios. Limits are set on the effective cutoff scale Λ, and on the annihilation rate for DM particles, assuming that their branching fraction to quarks is 100%. Additionally, the most stringent 95% confidence level limits to date on the unparticle model parameters are obtained.
dc.description.versionPeer Reviewed
dc.identifierPhys.Rev. D97 (2018) 099903; DOI 10.1103/PhysRevD.93.052011, 10.1103/PhysRevD.97.099903
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevD.93.052011, 10.1103/PhysRevD.97.099903
dc.identifier.urihttp://hdl.handle.net/10400.26/26978
dc.language.isoeng
dc.titleSearch for dark matter and unparticles produced in association with a Z boson in proton-proton collisions at $\sqrt s=$ 8  TeV
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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