Simulator: the 4D neutrino ring
Explore light masses, active-current deficit and six heavy pairs in the supported four-dimensional neutrino-ring research model.
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 study how a model can preserve selected light-sector quantities while changing its heavy states and interactions. This is a four-dimensional deconstructed ring at a fixed phase background, with explicitly stated leading-order approximations. It is separate from the five-dimensional builder.
First steps
- Choose Neutrino ring and start from its default point.
- Read whether calibration is enabled: it fixes two chosen light-sector targets.
- Change one link, portal or Majorana input and inspect masses and active weights together.
- Use the dedicated flavour, fixed-light-input and decay guides before interpreting those additional experiments.
Controls and inputs
| Control | Meaning | Try this |
|---|---|---|
| Scale f, link t/f and portals q, r | Set the conserving mass structure. The scale is dimensionful; the link and portal ratios are dimensionless. | Change one ratio at fixed f and read the heavy centres. |
| Majorana inputs μA and μB | Small symmetry-breaking mass entries displayed in keV. | Vary μB with calibration enabled and compare light inputs with pair splittings. |
| Calibration | Solves for entries that reproduce the chosen 0.1 eV light mass and 10⁻⁴ deficit in the reference setup. | Disable it before treating the Dirac entry and μA as independently adjustable. |
| CMS flavour and Dirac/Majorana reference | Selects the published single-HNL hypothesis used for the overlay. | Read the pair-summed or per-component mixing convention after switching hypothesis. |
Reading the results
| Result | Meaning |
|---|---|
| Light mass and active deficit | A calculated response or a reproduced calibration target, depending on the control setting. |
| Six heavy centres and splittings | Centres are shown in GeV and splittings in eV. The approximation diagnostics must accompany them. |
| CMS comparison and source record | Uses named HEPData tables, interpolation brackets and the selected flavour/hypothesis; it does not extrapolate beyond the table. |
The calibration targets are supplied inputs, not predictions. Heavy centres, light masses and pair splittings use different displayed units. The CMS overlay is a conditional single-HNL reference comparison, not a full multi-state ring exclusion.
Worked example
Change a heavy splitting while keeping light targets
- Restore the default ring with calibration enabled.
- Record the light mass, deficit and first heavy splitting.
- Change μB and read all three quantities again.
- Inspect the approximation diagnostics and save the full input record.
What to expect: At the displayed order, this path can change heavy-pair splitting while preserving the chosen light targets. That freedom prevents a unique heavy prediction from those targets alone.
Scope and limitations
- The phase is held at θ = π; the complete vacuum and radial-stability problem is not solved here.
- One base-ring Yukawa vector has light flavour rank at most one. The separate three-copy card reconstructs supplied flavour inputs.
- The small-insertion diagnostic is not a uniform error bound, especially near small inter-pair gaps.
- Single-HNL limits and exclusive-flavour assumptions do not automatically apply to six interfering heavy pairs.
If something is unclear
The light mass does not change when a parameter moves.
Check whether calibration is holding it fixed by construction.
A CMS ratio is absent at a mass point.
Check the tabulated range and duplicated transition knots. The laboratory deliberately withholds an ambiguous or extrapolated ratio.
Terms used here
Sources and attribution
Current instrument guide. Archived editions retain their own scope.
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