A Neutrino Carrier Prediction: Robustness and a Framework for Experimental Testing

The full ARC and dependency papers for the Symmetry ARC are available at the site linked in my Bio... A Neutrino Carrier Prediction: Robustness and a Framework for Experimental Testing is the capstone of the AASC Physical Carrier Realization program for the neutrino sector. It composes the final carrier, observable, and robustness results of PCR-6, PCR-7, and PCR-7.5 over the same accepted source-faithful physical realization, establishing that the terminal neutrino carrier, its internal spectral sectors, the charged-current observable packet, perturbative stability properties, and prospective experimental record all refer to one physical apex rather than separately fitted marginal constructions. For each accepted realization in the two completed source-qualified vectorlike-joint sectors, the paper obtains exactly one continuation-bearing hybrid local matter carrier with three nondegenerate light standing sectors and one rank-three heavy sector. At the unperturbed source, the active charged-current deficit and inclusive heavy charged-current weight satisfy the exact relation \[ \Delta_{\rm act}=\Omega_H=\delta_E I_3, \qquad \operatorname{rank}\Omega_H=3, \]with nonzero structural heavy support. On the licensed common-loop-kernel continuation class, the corresponding heavy off-diagonal charged-lepton-flavour-changing amplitude vanishes. The paper then studies which parts of this prediction survive perturbation. One-carrier identity has positive radius on certified carrier trace cells; the light-heavy closure relation remains exact on the block-isometry class; rank-three heavy support has a positive norm radius; while exact heavy degeneracy and exact flavor universality are stronger symmetry-protected properties with zero unrestricted symmetry-breaking radius. The strongest joint robustness statement is therefore explicitly intersection-qualified rather than represented by a single generic robustness radius. The structural prediction is connected to experiment through a conditional same-record testing framework. The paper proposes flavor-complete charged-current spectral tomography in which the active normalization deficit and inclusive heavy support are reconstructed under common controls. It further identifies a source-certified HNL scouting region of 28–30 GeV with a 0.2 mm response benchmark, supported by the prior D3 source continuum, a direct 30 GeV ATLAS anchor, an exact lifetime-reweight grid point, and on-shell-\(W\) kinematics. The associated experimental architecture calls for flavor-complete charged-current parent tagging, LNC/LNV-inclusive heavy reconstruction, prompt and near-prompt event categories, inclusive heavy-support reconstruction, and common active-normalization, sideband, and control records capable of testing the \(\Delta_{\rm act}=\Omega_H\) closure relation. The 28–30 GeV / 0.2 mm pair is explicitly a search benchmark rather than a predicted pole mass or proper lifetime; detector-level discrimination remains conditional on an experiment-specific SPIC and qualified held-out evaluation. The capstone therefore supplies a child-qualified HNL prediction, feature-specific robustness theorem, experimentally motivated search window, and predeclared falsification framework while leaving numerical complex-pole mass and lifetime, present-facility sensitivity, the unresolved parent neutrino family, and broader microscopic uniqueness questions explicitly open.