Abstract
We present the public code ScannerS–2 that performs parameter scans and checks parameter points in theories beyond the Standard Model (BSM) with extended scalar sectors. ScannerS incorporates theoretical and experimental constraints from many different sources in order to judge whether a parameter point is allowed or excluded at approximately {95}{%}~text {{CL}}. The BSM models implemented in ScannerS include many popular BSM models such as singlet extensions, different versions of the Two-Higgs-Doublet Model, or the different phases of the Next-to Two-Higgs-Doublet Model. The ScannerS framework allows straightforward extensions by additional constraints and BSM models.
Highlights
All of the beyond the Standard Model (BSM) models implemented in ScannerS are pure electroweak (EW) scalar extensions of the SM
The models implemented in ScannerS range from simple singlet extensions of the SM, through the commonly used variants of the two-Higgs-doublet model (2HDM) to extensions by both additional doublets and scalar singlets. We have found these models to be extremely useful as benchmark models for both collider physics and particle cosmology, and as well understood reference models to study the impact of novel theoretical calculations
The parameter scan approach employed in ScannerS does not construct a global likelihood distribution but instead uses a set of individual constraints. This means, that ScannerS tests the model predictions for the input parameter points against all implemented constraints and treats each parameter point that passes all constraints as allowed. This point-by-point approach means that no overall best-fit-point is found, nor is the resulting sample of allowed parameter points a faithful representation of the global likelihood distribution
Summary
Experimental constraints in ScannerS are implemented at a confidence level (CL) of 95% or – almost equivalently – 2σ while theoretical constraints are simple exclusions without an associated statistical interpretation. The allowed parameter points returned by ScannerS are valid from a theoretical point of view and not excluded by observations. Skip, is set for a constraint, no calculations associated with it will be performed and parameter points will not be tested against it. Parameter points will be treated as allowed whether they fulfill the constraint or not, while an additional output value will be added to indicate if the specific constraint was fulfilled. Detailed technical information regarding the implementation of constraints in ScannerS can be found in the online documentation for the ScannerS::Constraints namespace. The online documentation lists all output quantities associated to the constraints
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