Abstract
We study the seven-dimensional Minimal Supersymmetric Standard Model (MSSM7) with the new GAMBIT software framework, with all parameters defined at the weak scale. Our analysis significantly extends previous weak-scale, phenomenological MSSM fits, by adding more and newer experimental analyses, improving the accuracy and detail of theoretical predictions, including dominant uncertainties from the Standard Model, the Galactic dark matter halo and the quark content of the nucleon, and employing novel and highly-efficient statistical sampling methods to scan the parameter space. We find regions of the MSSM7 that exhibit co-annihilation of neutralinos with charginos, stops and sbottoms, as well as models that undergo resonant annihilation via both light and heavy Higgs funnels. We find high-likelihood models with light charginos, stops and sbottoms that have the potential to be within the future reach of the LHC. Large parts of our preferred parameter regions will also be accessible to the next generation of direct and indirect dark matter searches, making prospects for discovery in the near future rather good.
Highlights
The most straightforward supersymmetric extension of the Standard Model (SM) of elementary particles is the Minimal Supersymmetric Standard Model (MSSM) [1]
SshAbt/o/oZpHttcofuofmun-anncnneonel-:ilah:1ni1.ln6.ai6thmimoilχnaχ10 ̃:t10im≤o≤nt1:mmm≤lihgbeh11at.v≤2≤y m≤12.χ. ̃22410,.mm4χmχ1010,χ, ̃10, where ‘heavy’ may be H 0 or A0, and ‘light’ may be h0 or Z 0, and a parameter combination qualifies as a member of a region if either condition is satisfied. This is the strategy we adopt in general: if a model fulfils one of these conditions, we include it in the region, even if it ends up becoming a member of multiple regions, and even if some dominate over others
We have carried out an extensive global fit of the 7-parameter, weak-scale phenomenological MSSM, using the newlyreleased GAMBIT global fitting framework
Summary
The most straightforward supersymmetric extension of the Standard Model (SM) of elementary particles is the Minimal Supersymmetric Standard Model (MSSM) [1]. The MSSM can help deal with many of the theoretical and experimental shortcomings of the SM Most notably it stabilises the electroweak scale [2,3,4,5,6] with respect to large corrections from new physics at the Planck scale [7,8,9,10,11], allows the unification of gauge couplings [12,13,14,15], provides a dark matter (DM) candidate that can fit the observed relic abundance [16,17] and predicts a light Higgs boson, in accordance with the 2012 discovery [18,19]. Due to the steady stream of results from the LHC, the implications of collider searches for the MSSM have been a active field of study [136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159]
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