Chiral doublers of heavy-light baryons

Abstract

We discuss the consequences of the chiral doubling scenario for baryons built of heavy and light quarks. In particular, we use the soliton description for baryons, demonstrating why each heavy-light baryon should be accompanied by the opposite parity partner. Our argumentation holds both for ordinary baryons and for exotic heavy pentaquarks which are required by the symmetries of QCD to appear in parity doublets, seperated by the mass shift of the chiral origin. Interpreting the recently observed by BaBaR, CLEO and Belle charmed mesons with assignment $(0^{+},1^{+})$ as the chiral partners of known $D$ and $D^{\ast }$ mesons, allows us to estimate the parameters of the mesonic effective lagrangian, and in consequence, estimate the masses of ground states and excited states of both parities. In particular, we interpret the state recently reported by the H1 experiment at HERA as a chiral partner ${\tilde{\Theta }}_c^0(3099)$ of yet undiscovered ground state pentaquark ${\Theta }_c^0(2700)$.

Comments: 10 pages, in v2 some typos corrected, references added