From theκvia theDs0*(2317)to the

Abstract

Pole trajectories connecting light and heavy scalar mesons, both broad resonances and quasibound states, are computed employing a simple coupled-channel model. Instead of varying the coupling constant as in previous work, quark and meson masses are continuously changed, so as to have one scalar meson evolve smoothly into another with different flavor(s). In particular, it is shown, among several other cases, how the still controversial K 0 800 turns into the established c0 , via the disputed D s 2317. Moreover, a 0 c0 3946 is predicted, which may correspond to the recently observed Y3943 resonance. These results lend further support to our unified dynamical picture of all scalar mesons, as unitarized q q states with important two-meson components.

Glueballs, hybrids, multiquarks

“…This may shift the mass of the hypothesised D * 0 state to higher masses. Beveren et al [854] propose it to have 2114 MeV. The D * s0 (2317) radial excitation is expected at about 2650 MeV/c 2 .…”

“…Close and Tornqvist [1103] propose a nonet of complex objects: near the centre they are 4-quark states, with some (qq) in P -wave; further out they rearrange in colour to two colourless (qq)pairs and finally to meson-meson states. Beveren and colleagues [854] show how light and heavy scalar mesons can be linked to one another by a continuous variation of the masses involved. They conclude that all scalar mesons can be understood as ordinary qq states strongly distorted due to coupled channels, and suggest that labelling scalar mesons as qq states as opposed to dynamical meson-meson resonances makes no sense, since one kind of pole can be turned into another by tiny parameter variations.…”

“…The standard cs charm strange scalar meson D s0 is predicted at about 2.79 GeV and with 200 MeV width. In [854], the D s0 (2317) is linked to the when the quark masses are lowered, and to c0 for larger quark masses. We support this view (see Section 11.6.3).…”

Multichannel calculation of the very narrow D s0 * (2317) and the very broad D 0 * (2300–2400)

“…As a result, both the quasi-bound D * s0 (2317) below the DK threshold and the very broad D * 0 (2300-2400) resonance above the Dπ threshold were roughly reproduced, though with a too low-lying D * 0 (2300-2400) pole. Scaling arguments from flavour invariance later allowed to somewhat improve [2,8,9] our predictions, with no new parameters. In the present study (also see Ref.…”

Multichannel calculation of the very narrow Ds0 *(2317) and the very broad D0 *(2300-2400)

“…Ref. [2] for a list of references). Moreover, the very broad charmnonstrange partner meson D * 0 (2300-2400) 1 discovered [4] shortly afterwards further added to the confusion, as its Breit-Wigner mass seems of the same order as the mass of the D * s0 (2317), and perhaps even larger [5].…”