2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45510We compute the chiral corrections to the hyperfine splittings $Δ_D=(m_{D^*_s}-m_{D_s})-(m_{D^{*+}}-m_{D^+})$ and $Δ_B=(m_{B^*_s}-m_{B_s})-(m_{B^{*0}}-m_{B^0})$ arising from one-loop chiral corrections, working in a framework of an effective chiral lagrangian incorporating chiral, heavy flavour and spin symmetric terms and first order breaking terms. Among these terms, those responsible for the spin-breaking difference between the couplings $g_{P^* P^* π}$ and $g_{P^* P π}$ are evaluated in the QCD sum rules approach. Their contribution to $Δ_D$ and to $Δ_B$ appears to cancel previously estimated large chiral effects, giving an estimate in agreement with the experimental data.5 pages, latex, no figures. To appear in the Proceedings of the XXXth Rencontres de Moriond, Les Arcs, France, March 1995High Energy Physics - Phenomenologytext