In a U(1)B-L model with four chiral fermions, conversion-driven freeze-out lets a long-lived heavier fermion set the dark matter relic density while direct detection stays weak.
Search for heavy narrow dilepton resonances in pp collisions at sqrt(s) = 7 TeV and sqrt(s) = 8 TeV
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abstract
An updated search for heavy narrow resonances decaying to muon or electron pairs using the CMS detector is presented. Data samples from pp collisions at sqrt(s) = 7 TeV and 8 TeV at the LHC, with integrated luminosities of up to 5.3 and 4.1 inverse femtobarns, respectively, are combined. No evidence for a heavy narrow resonance is observed. The analysis of the combined data sets excludes, at 95% confidence level, a Sequential Standard Model Z'[SSM] resonance lighter than 2590 GeV, a superstring-inspired Z'[psi] lighter than 2260 GeV, and Kaluza-Klein gravitons lighter than 2390 (2030) GeV, assuming that the coupling parameter k/M-bar[Pl] is 0.10 (0.05). These are the most stringent limits to date.
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Evading Dark Matter Bounds through NLSP-Assisted Freeze-Out with Long-Lived Signatures
In a U(1)B-L model with four chiral fermions, conversion-driven freeze-out lets a long-lived heavier fermion set the dark matter relic density while direct detection stays weak.