Paper CCXII: The B Meson from Full G2 Generator Activation and the Seifert Efficiency Factor from Klein Quartic Handle Geometry:

We complete the Klein Quartic meson mass derivation (Papers CXC, CCX, CCXI) with two results. First, the B± meson mass (5279.6 MeV) follows from the winding number Nw(B) = dim(G2) = 14 — all 14 generators of the G2 Lie algebra are activated in the bottom quark's H−-sector crossing — at the same inradius path length L = rin = 0.5453 used for the D meson, giving mB = 5277 MeV (0.05% residual). Second, the Seifert efficiency factor ηSeifert — which corrects all H−-sector crossing masses from their bare inradius prediction to their observed values via m = mbare ×(1+fbulk ×ηSeifert) — is derived exactly from the Klein Quartic handle geometry: ηSeifert = F −2g F = 1 −dim(G2) · g |Aut(M)| = 1 −14 × 3 168 = 3 4, where F = 24 is the number of heptagonal faces, g = 3 is the genus, dim(G2) = 14, and |Aut(M)| = 168. The factor 3/4 arises because each of the g = 3 topological handles blocks 2 of the 24 face orbits from direct geodesic transport, forcing detours that reduce the crossing efficiency. With ηSeifert = 3/4 and fbulk = 3.6917%, the universal Seifert correction factor is 1 + fbulk × 3/4 = 1.02769, recovering mD = 1869.0 MeV and mB = 5277.2 MeV simultaneously. Part of the One-Octonion Brane-Bulk Framework series. Anchor DOI: 10.5281/zenodo.19120873. Community: one-octonion-brane-bulk. Author: Bharathi Dasan Jagadeesan, M.D., University of Minnesota. ORCID: 0000-0002-1143-941X.