Dynamically generated open-charm baryons beyond the zero-range approximation

Abstract

The interaction of the low-lying pseudoscalar mesons with the ground-state baryons in the charm sector is studied within a coupled-channel approach using a t-channel vector-exchange driving force. The amplitudes describing the scattering of the pseudoscalar mesons off the ground-state baryons are obtained by solving the Lippmann-Schwinger equation. We analyze in detail the effects of going beyond the t = 0 approximation. Our model predicts the dynamical generation of several open-charm baryon resonances in different isospin and strangeness channels, some of which can be clearly identified with recently observed states.

Interpretation of the newly observed Ωc0 resonances

“…Besides, some excited states of Ω 0 c (X) baryons are also predicted from meson-baryon unitarization starting from a lowest order potential in Refs. [27,28], where the existence of a bound state at 2959 MeV, near the lowest threshold, and two resonances placed at 2966 and 3117 MeV are predicted in this scheme. The widths of the two resonances are calculated as Γ (2966) …”

Combining heavy quark spin and local hidden gauge symmetries in the dynamical generation of hidden charm baryons

“…[46] also accommodates naturally the three stars charmed resonances Λ c (2595) and Λ c (2625). The Λ c (2595) was previously dynamically generated in other schemes based on t-channel vector-meson-exchange models [33,[35][36][37], but in [46], as first pointed out in [44], a large (dominant) ND * component in its structure was claimed. This is in sharp contrast with the findings of the former references, where it was generated mostly as one ND bound state, since the ND * channel was not considered in the coupled channels space.…”

“…As mentioned in [36], while the potentials obtained are fine with this prescription, in the coupled channel approach one is missing channels that mix charm and strangeness in that approach. In [36,37] the work of [31] is retaken and appropriate modifications are done in the potentials and the regularization scheme. Similar work is also done by the Jülich group in [38][39][40].…”

Exotic dynamically generated baryons with negative charm quantum number

“…For instance in [9,10] a rich spectrum of charmed baryons is generated dynamically and accommodates many of the experimentally observed states. Moreover, predictions are made in [11] for the spectrum of hidden charm, anticharmed, charmed, and C ¼ 2 J P ¼ 1 2 À baryons.…”