222 research outputs found
The unquenched quark model
In this contribution, we briefly discuss the results for charmonium and
bottomonium spectra with self-energy corrections in the unquenched quark model,
due to the coupling to the meson-meson continuum. The UQM formalism can be
extended to include also the effects of hybrid mesons, i.e. hybrid loops.
Finally, we discuss the results of a calculation of hybrid mesons spectrum in
Coulomb Gauge QCD.Comment: Talk given at the conference "Dark Matter, Hadron Physics and Fusion
Physics", Messina (Italy), September 24-26, 201
Threshold corrections of and states and and transitions of the in a coupled-channel model
We calculate the masses of and states
with threshold corrections in a coupled-channel model. Here, the meson
quarkonium core is augmented by higher Fock components due to pair-creation
effects. According to our results, we interpret the resonances characterized by
very small threshold corrections, like 's, as almost pure
quarkonia, and those states characterized by non-negligible threshold
corrections, like the , as quarkonium cores plus meson-meson
components. We also study the and hidden-flavor
strong decays of the . The decays are calculated as the dissociation
of one of these components () into a state
() plus a light meson ( or ) in a potential model. In
particular, our result for the ratio between the and widths (0.6) is compatible with the present
experimental data () within the experimental error
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