Higgs rates, total width and experimental comparisons
Construct an explicit CP-even Higgs scenario at 125.2 GeV and inspect production, widths, branching fractions and matching external experimental results.
Control names are kept as they appear in the application. Start with a reference, change one input at a time, and retain the assumptions with your result.
What this tool is for
Use this to see why a production correction alone is insufficient for a Higgs signal comparison: partial widths, the total width and branching fractions enter together. Versioned external results supply a separate experimental calculation for a matching scenario.
First steps
- Start with the SM reference preset.
- Change one coupling or the invisible width.
- Read the total width and branching fractions with production rates.
- Use an external HiggsTools result only when it matches the current inputs and recorded version.
Controls and inputs
| Control | Meaning | Try this |
|---|---|---|
| κW = κZ and common fermion κ | Explicit effective-coupling assumptions for this CP-even scenario. | Change one while keeping the others fixed. |
| Effective κg, κγ and κZγ | Independent effective amplitudes in the supported reference parameterization. | Compare the top-tower preset with the SM reference. |
| Invisible width [MeV] | An additional assumed partial width included in the total. | Increase it and compare visible branching fractions. |
Reading the results
| Result | Meaning |
|---|---|
| Production cross sections | Use the pinned HiggsPredictions reference at the listed collider energies. |
| Total width, branching fractions and signal strengths | Account for all partial widths listed in this scenario. |
| Matching external experimental result | A versioned HiggsBounds/HiggsSignals calculation, available only for compatible inputs. |
The top-tower preset changes its specified gluon amplitude and assumes the remaining couplings are SM-like. It is not a complete GHU-model prediction or exclusion.
Worked example
Change a branching fraction without changing production
- Load the SM reference.
- Record ggH production and a visible branching fraction.
- Increase only the invisible width.
- Compare production, total width and visible signal strength.
What to expect: Production can remain unchanged while the extra width reduces visible branching fractions and signal strengths.
Scope and limitations
- Effective couplings are assumptions unless derived from a complete model.
- A missing or mismatched external result is not an allowed verdict.
- The number of experimental observables is not automatically the number of statistical degrees of freedom.
If something is unclear
The external result no longer applies.
Restore the matching inputs or calculate/import a new matching result through the documented external workflow.
Sources and attribution
Current instrument guide. Archived editions retain their own scope.
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