Regular Article - Theoretical Physics
Lowest-lying even-parity mesons: heavy-quark spin-flavor symmetry, chiral dynamics, and constituent quark-model bare masses
Instituto de Física Corpuscular (IFIC), Institutos de Investigación de Paterna, Centro Mixto CSIC-Universidad de Valencia, Aptd. 22085, 46071, Valencia, Spain
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Accepted: 3 March 2017
Published online: 18 March 2017
The discovery of the and resonances in the charmed-strange meson spectra revealed that formerly successful constituent quark models lose predictability in the vicinity of two-meson thresholds. The emergence of non-negligible effects due to meson loops requires an explicit evaluation of the interplay between and Fock components. In contrast to the sector, there is no experimental evidence of bottom–strange states yet. Motivated by recent lattice studies, in this work the heavy-quark partners of the and states are analyzed within a heavy meson chiral unitary scheme. As a novelty, the coupling between the constituent quark-model P-wave scalar and axial mesons and the channels is incorporated employing an effective interaction, consistent with heavy-quark spin symmetry, constrained by the lattice energy levels.
© The Author(s), 2017