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The Belle Collaboration has recently reported a study of the decays $B \toD_{s1}(2536)^{+}\bar{D}^{(\ast)}$ and has given also estimates of relevantratios between branching fractions of decays $B \to D^{(\ast)}D_{sJ}^{(\ast)}$providing important information to check the structure of the$D_{s0}^{\ast}(2317)$, $D_{s1}(2460)$ and $D_{s1}(2536)$ mesons. Thedisagreement between experimental data and Heavy Quark Symmetry has been usedas an indication that $D_{s0}^{\ast}(2317)$ and $D_{s1}(2460)$ mesons couldhave a more complex structure than the canonical $c\bar{s}$ one. We analyzethese ratios within the framework of a constituent quark model, which allows usto incorporate the effects given by finite $c$-quark mass corrections. Ourfindings are that while the $D_{s1}(2460)$ meson could have a sizablenon-$q\bar{q}$ component, the $D_{s0}^{\ast}(2317)$ and $D_{s1}(2536)$ mesonsseem to be well described by a pure $q\bar{q}$ structure.

Nonleptonic $B \to D^{(*)}D_{sJ}^{(*)}$ decays and the nature of the orbitally excited charmed-strange mesons

Nonleptonic $B \to D^{()}D_{sJ}^{()}$ decays and the nature of the orbitally excited charmed-strange mesons