Observed Ds(2317) and tentative D(2100-2300) as the charmed cousins of the light scalar nonet
Abstract
The very recently observed D*sJ(2317)+ meson is described as a quasi-bound scalar cs state in a unitarized meson model, owing its existence to the strong 3P0 OZI-allowed coupling to the nearby S-wave DK threshold. By the same mechanism, a scalar D0(2100-2300) resonance is predicted slightly above the Dπ threshold. These scalars are the charmed cousins of the light scalar nonet f0(600), f0(980), K*0(800), and a0(980), reproduced by the same model. The standard cn and cs charmed scalars D0 and Ds0, cousins of the scalar nonet f0(1370), f0(1500), K0*(1430), and a0(1450), are predicted to lie at about 2.64 and 2.79 GeV, respectively, both with a width of some 200 MeV.
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