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It is widely accepted that: (i) the angle-resolved photoemission spectroscopy(ARPES) data produce evidences for the opening of a d-wave pairing gap incuprates compounds described at low energies and temperatures by a BCS theory,and (ii) the basic pairing mechanism arises from the antiferromagnetic exchangecorrelations, but the charge fluctuations associated with double occupancy of asite also play an essential role in doped systems. The simplest model that isconsistent with the two statements is the $t$-$U$-$V$-$J$ model. We have shownthat the inelastic neutron scattering data on $YBa_2Cu_3O_{6.7}$ [Phys. Rev.Lett. \textbf{83}, 608 (1999)] combined with the corresponding ARPES data allowus to obtain the strength of the on-site repulsive interaction $U$, as well asthe strengths of the spin-independent attractive interaction $V$ and thespin-dependent antiferromagnetic interaction $J$.

Strength of the interactions in $YBa_2Cu_3O_{6.7}$ obtained from the inelastic neutron-scattering measurements