MAV-MCC LHCb Request #91 — LOW-Range Structural PASS-like Persistence under Reconstruction Change (formal primary verdict: fail)

STRUCTURAL LOW-RANGE RESULT: PASS-LIKE.The MAV-MCC LHCb Request #91 analysis shows that the searched LOW-vs-REST structure survives a substantially different reconstruction and canonicalization pipeline on a very large corpus. Starting from approximately 399.356 GB of raw-line/Ntuple-derived data, the procedure produced 172,382,046 canonical physical candidates after 0.001 MeV/c momentum-grid canonicalization, independent FirstPion/SecondPion handling, symmetric K/π hypothesis treatment, duplicate removal and global cross-shard resolution. The LOW-range observable did not disappear into the frozen null distribution. The observed network score was S_net = -0.00183180155849 while the 100,000 frozen-null realizations reached a minimum of only approximately -0.00131257190212. Therefore, 0 of 100,000 null realizations were as negative as or more negative than the observed result. The information searched for in the LOW range remained detectable after the large-scale reconstruction change, but appeared with the sign opposite to the pre-frozen positive-direction expectation. This motivates the classification “LOW-range structural persistence: PASS-like diagnostic.” The PASS-like designation refers specifically to the persistence and non-null character of the LOW-vs-REST structure under reconstruction change; it is not a retroactive modification of the frozen decision rule. Formal frozen primary verdict: FAIL . The pre-registered protocol required S_N1 > 0, S_N2 > 0, S_base > 0 and S_net > P99_null_net. Because the observed scores have the opposite sign, the official primary verdict remains FAIL and is permanently preserved for this execution. The result therefore separates two experimentally distinct questions that had previously been coupled: persistence of the LOW-range structure and direction of its baryon/antibaryon contrast. Request #91 gives a structural PASS-like result for the first while falsifying the frozen positive-direction prediction for the second. The approximately 400 GB source corpus must not be interpreted as unbiased detector RAW or NoBias data. It remains downstream of zero-suppression, detector acceptance, trigger/stripping selection, reconstruction, PID/preselection and magnet-dependent instrumental effects. Accordingly, a future NoBias/Minimum-Bias/Zero-Bias or least-selected dataset represents the appropriate next discriminating test of whether the observed LOW-range persistence survives a further substantial reduction of selection bias. This record is classified as a frozen-mathematics reprocessing / reconstruction-robustness test and does not claim validation of the full MAV-MCC framework or an official LHCb CP-violation measurement.