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Title
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Search for dark matter and unparticles produced in association with a Z boson in proton-proton collisions =8 TeV
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Author
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Institution/Organisation
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CMS Collaboration
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Abstract
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| A 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., 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. |
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Language
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English
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Source (journal)
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PHYSICAL REVIEW D
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Publication
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2016
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DOI
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10.1103/PHYSREVD.93.052011
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Volume/pages
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93
:5
(2016)
, 29 p.
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Article Reference
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052011
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ISI
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000372720400001
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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