1995/05/23 by Nicola Di Bartolomeo, Nicola Bartolomeo, Di Bartolomeo, Nicola
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9505363
5 pages, latex, no figures. To appear in the Proceedings of the XXXth Rencontres de Moriond, Les Arcs, France, March 1995
arxiv created 1995/05/23 · openalex publication_date 1995/05/23 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We compute the chiral corrections to the hyperfine splittings ΔD=(mD^*s-mDs)-(mD*+-mD+) and ΔB=(mB^*s-mBs)-(mB*0-mB0) 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 gP^* P^* π and gP^* P π are evaluated in the QCD sum rules approach. Their contribution to ΔD and to ΔB appears to cancel previously estimated large chiral effects, giving an estimate in agreement with the experimental data.