Comment on the new $D_s^{(\ast )+}{\pi }^0$ resonances

Abstract

We propose an explanation of the new resonances observed in $D_s^{(\ast )+}{\pi }^0$ decays. We suggest that the data can be explained by the mixing of conventional p-wave excited $D_s^{+}$ mesons with 4-quark states. The narrow states observed in $D_s^{+}{\pi }^0$ and $D_s^{\ast +}{\pi }^0$ are primarily p-wave $D_{sJ}^{\ast }$ states, while the predominantly 4-quark states are shifted above $D^{(\ast )}K$ threshold and should be broad. Ranges for the mixing parameter and mass of the 4-quark state in this scenario are given. Other experimental consequences are discussed.

4 pages, 2 figures. Updated references. To appear in Phys. Lett. B

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• Observation of a Narrow Meson Decaying to Ds+pi0 at a Mass of 2.32 GeV/c^2
• Observed D_s(2317) and tentative D(2100-2300) as the charmed cousins of the light scalar nonet
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