QCD-Matched Gluonic Response in Heavy-Quarkonium Born-Oppenheimer EFT: Locality, Channel Factorization, and the Peskin Limit

Abstract

We formulate a source-dependent QCD-to-BOEFT matching for the gluonic response of a stable compact heavy-quarkonium state. The matched complementary-space resolvent preserves coupled Born-Oppenheimer dynamics, while an exact Feshbach decomposition separates channels retained explicitly from sectors integrated out at the next matching step. Spectral separation, kernel analyticity, and joint propagation-source bounds provide sufficient conditions for a local channel-factorized OPE; otherwise low-energy BO poles and cuts remain dynamical. The weak-coupling pNRQCD response is recovered as a limiting reference problem. With the additional leading-$E1$, large-$N_c$/free-octet assumptions, the source-weighted spectral measure reproduces the established Bhanot-Peskin electric moments and dissociation cut. For a Coulombic spin-singlet $1S$ state we also obtain the sequential-$M1$ contribution $c_{B,GG}^{(1)ij} =5πα_s^2(c_FV_{\rm iso}^{(s)})^2δ^{ij}/16$ and the covariant-kinetic seagull contribution $c_{B,\mathrm{dia}}^{(1)ij} =-πα_s^2δ^{ij}/4$. These are identifiable components, not the complete magnetic matching coefficient.