Abstract
We have explored Natural Supersymmetry (NSUSY) scenarios with low values of the $\mu$ parameter which are characterised by higgsino-like Dark Matter (DM) and compressed spectra for the lightest MSSM particles, $\chi^0_1$, $\chi^0_2$ and $\chi^\pm_1$. This scenario could be probed via monojet signatures, but as the signal-to-background ratio (S/B) is low we demonstrate that the 8 TeV LHC cannot obtain limits on the DM mass beyond those of LEP2. On the other hand, we have found, for the 13 TeV run of the LHC, that by optimising kinematical cuts we can bring the S/B ratio up to the 5(3)% level which would allow the exclusion of the DM mass up to 200(250) GeV respectively, significantly extending LEP2 limits. Moreover, we have found that LUX/XENON1T and LHC do play very complementary roles in exploring the parameter space of NSUSY, as the LHC has the capability to access regions where DM is quasi-degenerate with other higgsinos, which are challenging for direct detection experiments.
Highlights
It has been shown that usual fine-tuning measures, defined as the sensitivity of the weak scale to fractional variations in the fundamental parameters of the theory, can be low even if the masses of the supersymmetric scalars are large
We take advantage of the fact that Natural Supersymmetry (NSUSY) scenarios can be effectively described by a two dimensional parameter space, defined by the Dark Matter (DM) mass, i.e. the mass of χ01, and ∆M, the mass difference between the DM candidate and the next to lightest supersymmetric (NLSP), typically χ±1, and our study explores the complementarity of the LHC and direct detection (DD) DM search experiments in covering this region
We have found that a cut around 600 (850) GeV for 100 fb−1 (3000 fb−1) provides α 2 and signal-to-background ratio (S/B) 0.03 iso-contours optimally close to each other, which maximises the reach of the 13 TeV LHC for the NSUSY parameter space
Summary
In the bases (B0, W 0, Hd0, Hu0) and (W 0, Hd0) the mass matrices of the neutralino and chargino sector of the MSSM are. Three body decays in the limit of small mass separation are discussed in [85], where an effective theory study of the pseudo-Dirac DM scenario [86,87,88] such as the higgsino-like was performed. A χ±1 with a long enough lifetime can be detected in the tracking detectors by identifying decays that result in tracks with no associated hits in the outer region of the tracking system as recently analysed by ATLAS [89] and CM [90] collaborations Both collaborations have obtained similar results, concluding on sensitivity for charginos with a lifetime between 0.1 ns and 100 ns and covering chargino mass up to 500 GeV which significantly surpass the reach of the LEP experiments. Our task is to analyse the potential of the monojet search to cover the NSUSY parameter space with ∆M 0.4 GeV
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