Status of chiral doublers of heavy-light hadrons in light of recent BaBar Cleo, Belle and Selex D_s states

Abstract

We explain the main idea of the chiral doublers scenario, originating from simultaneous constraints of chiral symmetry and of heavy quark spin symmetry on effective theories of heavy-light hadrons. In particular we discuss chiral doublers for mesons, chiral doublers for excited mesons, chiral doublers for baryons and chiral doublers for excited baryons. We point out the arguments why new states D_s(2317) and D_s(2457) might be viewed as chiral doublers of D_s and D_s^*. Then we comment on non-strange mesons D_0(2308) and D_1'(2427) observed by Belle and Focus, and on Theta_c(3099) signal observed by H1. Finally, we point out that very recent discovery by SELEX of D_s(2632), if confirmed by other experiments and if spin-parity of this state is 1^-, may be interpreted as a signal for chiral doubler of D_{s1}(2536). Such an identification implies another narrow, spin-parity 2^- D_s state ca 37 MeV above the new 1^-, corresponding to chiral partner of D_{s2}.