On charm baryon resonances and chiral symmetry

Abstract

We study heavy-light baryon resonances with quantum numbers J P = 1 2 − in terms of the non-linear chiral SU(3) Lagrangian. Within the χ−BS(3) approach a parameterfree leading order prediction is obtained for the scattering of Goldstone bosons off heavy-light baryon resonances with J P = 1 2 + . The three states Λ c1 (2593), Λ c0 (2880) and Ξ c1 (2790) discovered by the CLEO collaboration are recovered. We suggest the existence of resonance states that form an anti-quindecimplet, two sextet and two anti-triplet representations of the SU(3) group. In particular, narrow states with anomalous isospin (I) and strangeness (S) quantum numbers (I, S) = ( 1 2 , +1) are anticipated.

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

“…This agrees with the result of the matrix of Eqs. (29), (31) and (33). However the transition DΛ c → D * Σ c is not null and we evaluate it here.…”

“…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].…”

Charmed baryonic resonances in medium

“…Particularly, unitarized coupled-channel methods have been used in the meson-baryon sector with charm content [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], mostly motivated by the parallelism between the Λ(1405) and the Λ c (2595).…”

DN interaction from the Jülich meson-exchange model

“…To this end, coupled-channel meson-baryon models in the charm sector have been developed [8,9,10,11,12,13,14]. In those approaches the strong attraction is provided by vector-meson exchange [10,14], by the WeinbergTomazawa (WT) term [9,8,11,12,15], or by an extension of the WT interaction to an SU(8) spin-flavor scheme [13,16].…”

“…In those approaches the strong attraction is provided by vector-meson exchange [10,14], by the WeinbergTomazawa (WT) term [9,8,11,12,15], or by an extension of the WT interaction to an SU(8) spin-flavor scheme [13,16]. All of them obtained dynamically the Λ c (2595) resonance.…”