Current status of the light neutralino thermal dark matter in the phenomenological MSSM

Abstract

In a previous publication, we studied the parameter space of the phenomenological Minimal Supersymmetric Standard Model (pMSSM) with a light neutralino thermal dark matter ($M_{\tildeχ_1^0} \leq M_h/2$) and observed that the recent results from the dark matter and collider experiments put strong constraints on this scenario. In this work, we present in detail the arguments behind the robustness of this result against scanning over the large number of parameters in pMSSM. The Run-3 of LHC will be crucial in probing the surviving regions of the parameter space. We further investigate the impact of light staus on our parameter space and also provide benchmarks which can be interesting for Run-3 of LHC. We analyse these benchmarks at the LHC using the machine learning framework of \texttt{XGBOOST}. Finally, we also discuss the effect of non-standard cosmology on the parameter space.

Figures (24)

• Figure 1: Left: Parameter space in the $M_A$-${\rm tan}\beta$ plane satisfying the Higgs properties, LEP constraints, flavor constraints, and results of heavy Higgs boson searches implemented in HiggsBounds; Right: Parameter space in the $M_A$-${\rm tan}\beta$ plane zoomed-in to show the effect of the different flavor observables for $M_A<1$ TeV. The top and bottom panels are for $\mu>0$ and $\mu<0$ respectively.
• Figure 2: Variation of the $g_{h\tilde{\chi}_1^0\tilde{\chi}_1^0}$ coupling with $\mu$ ( top) and tan$\beta$ ( bottom) for $\mu>0$ ( left) and $\mu<0$ ( right) for points satisfying Higgs constraints, LEP and flavor constraints.
• Figure 3: Fraction of DM satisfied by $\tilde{\chi}_1^0$ ($\xi=\frac{\Omega_{\rm LSP}}{0.120}$) as a function of $M_{\tilde{\chi}_2^0}$ for both $\mu>0$ ( left) and $\mu<0$ ( right) with the "Before LZ" set of cuts.
• Figure 4: Variation of $\sigma_{SI}$ ( top left) and $\xi$ ( top right) with the DM-light Higgs boson coupling for two different ranges of tan $\beta$ for the $\mu>0$$Z$ funnel.
• Figure 5: Variation of the scaled SI DM-nucleon cross-section ($\sigma_{SI}\times\xi$) with $g_{h\tilde{\chi}_1^0\tilde{\chi}_1^0}$ for both $\mu>0$ ( left) and $\mu<0$ ( right) with the "Before LZ" set of cuts.