Abstract
We study the parameter space of the semi-constrained NMSSM, compatible with constraints on the Standard Model like Higgs mass and signal rates, constraints from searches for squarks and gluinos, a dark matter relic density compatible with bounds from WMAP/Planck, and direct detection cross sections compatible with constraints from LUX. The remaining parameter space allows for a fine-tuning as low as about 100, an additional lighter Higgs boson in the 60-120 GeV mass range detectable in the diphoton mode or in decays into a pair of lighter CP-odd Higgs bosons, and dominantly singlino like dark matter with a mass down to 1 GeV, but possibly a very small direct detection cross section.
Highlights
JHEP08(2014)046 terms involving the singlet only, or non-universal soft SUSY breaking terms involving SU(2) doublet or singlet Higgs fields
We study the parameter space of the semi-constrained NMSSM, compatible with constraints on the Standard Model like Higgs mass and signal rates, constraints from searches for squarks and gluinos, a dark matter relic density compatible with bounds from WMAP/Planck, and direct detection cross sections compatible with constraints from LUX
As a result of the simulations described in the previous section we found that the 95% confidence level (CL) upper limits on signal events in [3] lead to exclusion limits in the m0 − M1/2 or Mg − mqplanes in the NUH-NMSSM which are very similar to the CMSSM if the LSP is bino-like, but can be alleviated in the presence of a light singlino-like LSP at the end of the cascades [52, 53]
Summary
The NMSSM [44] differs from the MSSM due to the presence of the gauge singlet superfield. In between these regions defined in the planes of squark/gluino masses or m0/M1/2, exclusion does depend on their decays, in particular on the presence of a light singlino-like LSP at the end of the cascades [52, 53] The boundaries between these three regions were obtained with the help of the analysis of some hundreds of points in parameter space: events were generated by MadGraph/MadEvent [54] which includes Pythia 6.4 [55] for showering and hadronisation. In the NMSSM a singlino-like LSP can always be lighter than the lightest stau, and its relic density can be reduced to the WMAP/Planck These lower bounds on the squark and gluino masses dominate the lower bounds on the fine-tuning F T defined in (2.10). We conclude the discussion of the impact of LHC constraints on F T and the corresponding correlations with other parameters
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