Abstract
The new minimal supersymmetric standard model (nMSSM), a variant of the general next to minimal supersymmetric standard model (NMSSM) without $Z_3$ symmetry, features a naturally light singlino with a mass below 75 GeV. In light of the new constraints from LHC Run-1 on the Higgs couplings, sparticles searches and flavour observables, we define the parameter space of the model which is compatible with both collider and dark matter (DM) properties. Among the regions compatible with these constraints, implemented through NMSSMTools, SModelS and MadAnalysis 5, only one with a singlino lightest supersymmetric particle (LSP) with a mass around 5 GeV can explain all the DM abundance of the universe, while heavier mixed singlinos can only form one of the DM components. Typical collider signatures for each region of the parameter space are investigated. In particular, the decay of the 125 GeV Higgs into light scalars and/or pseudoscalars and the decay of the heavy Higgs into charginos and neutralinos, provide distinctive signatures of the model. Moreover, the sfermion decays usually proceed through heavier neutralinos rather than directly into the LSP, as the couplings to the singlino are suppressed. We also show that direct detection searches are complementary to collider ones, and that a future ton-scale detector could completely probe the region of parameter space with a LSP mass around 65 GeV.
Highlights
next to minimal supersymmetric standard model (NMSSM) provides a dark matter (DM) candidate, the lightest supersymmetric particle (LSP) neutralino, and its properties have been analysed, both in the NMSSM with arbitrary parameters at the SUSY scale [27, 28] and in the grand unified theory (GUT) scale constrained models [29,30,31]
We show that direct detection searches are complementary to collider ones, and that a future ton-scale detector could completely probe the region of parameter space with a LSP mass around 65 GeV
After having defined the different regions of the GUT scale parameter space obeying the basic set of collider, astrophysical, cosmological and theoretical constraints, we examine for each scenario the constraints from searches for sparticles at LHC Run-1 as well as from indirect searches for DM
Summary
The MSSM is defined by promoting each SM field Φ into a superfield Φ, doubling the Higgs fields with two SU(2)L doublets Hu, Hd and imposing R-parity conservation. The easiest solution to the μproblem is to introduce an extra gauge singlet S, coupled to the Higgs doublets and whose VEV is naturally of the order of Msusy This leads to the simplest extension of the MSSM, the NMSSM with a cubic (renormalisable) superpotential. The corresponding soft SUSY breaking potential is given by VnMSSM = m2Hu |Hu|2 + m2Hd |Hd|2 + m2S|S|2 + (λAλHuHdS + ξSS + h.c.) + m2Q|Q2| + m2U |UR2 | + m2D|DR2 | + m2L|L2| + m2E|ER2 | + (huAuQHuURc − hdAdQHdDRc − heAeLHdERc + h.c.). The minimal precision for radiative corrections presents the extra advantage of using less CPU time, which is crucial for scans on large parameter space In addition it allows to compute the complete effective Lagrangian in the Higgs sector with the same level of approximation. Note that the higher-order corrections to the Higgs selfcouplings encoded in the effective Lagrangian can in some cases have a significant effect on the DM relic density
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