Likelihood analysis of the minimal AMSB model.
Eur Phys J C Part Fields
; 77(4): 268, 2017.
Article
em En
| MEDLINE
| ID: mdl-28515671
ABSTRACT
We perform a likelihood analysis of the minimal anomaly-mediated supersymmetry-breaking (mAMSB) model using constraints from cosmology and accelerator experiments. We find that either a wino-like or a Higgsino-like neutralino LSP, [Formula see text], may provide the cold dark matter (DM), both with similar likelihoods. The upper limit on the DM density from Planck and other experiments enforces [Formula see text] after the inclusion of Sommerfeld enhancement in its annihilations. If most of the cold DM density is provided by the [Formula see text], the measured value of the Higgs mass favours a limited range of [Formula see text] (and also for [Formula see text] if [Formula see text]) but the scalar mass [Formula see text] is poorly constrained. In the wino-LSP case, [Formula see text] is constrained to about [Formula see text] and [Formula see text] to [Formula see text], whereas in the Higgsino-LSP case [Formula see text] has just a lower limit [Formula see text] ([Formula see text]) and [Formula see text] is constrained to [Formula see text] in the [Formula see text] ([Formula see text]) scenario. In neither case can the anomalous magnetic moment of the muon, [Formula see text], be improved significantly relative to its Standard Model (SM) value, nor do flavour measurements constrain the model significantly, and there are poor prospects for discovering supersymmetric particles at the LHC, though there are some prospects for direct DM detection. On the other hand, if the [Formula see text] contributes only a fraction of the cold DM density, future LHC [Formula see text]-based searches for gluinos, squarks and heavier chargino and neutralino states as well as disappearing track searches in the wino-like LSP region will be relevant, and interference effects enable [Formula see text] to agree with the data better than in the SM in the case of wino-like DM with [Formula see text].
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Eur Phys J C Part Fields
Ano de publicação:
2017
Tipo de documento:
Article