Quasi-bound states in the continuum: a dynamical coupled-channel calculation of axial-vector charmed mesons

Details Quasi-bound states in the continuum: a dynamical coupled-channel calculation of axial-vector charmed mesons Quasi-bound states in the continuum: a dynamical coupled-channel calculation of axial-vector charmed mesons

2011-06-14

arxiv.org/abs/1106.2760v2

Phys. Rev. D 84 (2011) 094020

Physics

High Energy Physics

High Energy Physics - Phenomenology

REVTeX4, 4 pages, 3 figures, 2 tables. V2: 6 pages, 3 figures, 6 tables; paper expanded, Appendix and more tables added, excit

Scientific paper

Masses and widths of the charmed axial-vector mesons $D_1(2420)$, $D_1(2430)$, $D_{s1}(2536)$, and $D_{s1}(2460)$ are calculated nonperturbatively in the Resonance-Spectrum-Expansion model, by coupling various open and closed meson-meson channels to the bare $J^P=1^+$ $c\bar{q}$ ($q=u,d$) and $c\bar{s}$ states. The coupling to two-meson channels dynamically mixes and lifts the mass degeneracy of the spectroscopic $^3P_1$ and $^1P_1$ states, as an alternative to the usual spin-orbit splitting. Of the two resulting $S$-matrix poles in either case, one stays very close to the energy of the bare state, as a quasi-bound state in the continuum, whereas the other shifts considerably. This is in agreement with the experimental observation that the $D_1(2420)$ and $D_{s1}(2536)$ have much smaller widths than one would naively expect. The whole pattern of masses and widths of the axial-vector charmed mesons can thus be quite well reproduced with only two free parameters, one of which being already strongly constrained by previous model calculations. Finally, predictions for pole positions of radially excited axial-vector charmed mesons are presented.

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