Khachatryan, V.Sirunyan, A. M.Tumasyan, A.Adam, W.Asilar, E.Bergauer, T.The CMS Collaboration2025-03-072025-03-0720162470-00102470-0029https://doi.org/10.1103/PhysRevD.93.052011https://hdl.handle.net/20.500.12507/2993A 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.eninfo:eu-repo/semantics/openAccessArticle935WOS:0003727204000012-s2.0-8496397350110.1103/PhysRevD.93.052011Q1Q1