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Implication of chiral symmetry for the heavy-light meson spectroscopy

Many hadronic states observed since 2003,especially for the positive-parity charm-strange states $D_{s0}^\ast (2317)$and $D_{s1}(2460)$, do not conform with the conventional quark modelexpectations and raise various puzzles in charm meson spectroscopy. Wedemonstrate that those puzzles find a natural solution thanks to the recentdevelopment of chiral effective theory and Lattice simulations. The existenceof the $D_{s0}^\ast (2317)$ and $D_{s1}(2460)$ are attributed to thenonperturbative dynamics of Goldstone bosons scattering off $D$ and $D^\ast$mesons. It indicates that the lowest positive parity nonstrange scalar charmmesons, the $D_0^\ast(2400)$ in the Review of Particle Physics, should bereplaced by two states. The well constructed amplitudes are fully in line withthe high quality data on the decays $B^-\to D^+\pi^-\pi^-$ and $D_s^0\to\bar{D}^0K^-\pi^+$. This implies that the lowest positive-parity states aredynamically generated rather than conventional quark-antiquark states. Thispattern has also been established for the scalar and axial-vector mesons madefrom light quarks ($u$, $d$ and $s$ quarks). In a broader view, the hadronspectrum must be viewed as more than a collection of quark-model states.

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