Interpretation of the $$\Lambda _c(2910)^+$$ Λ c ( 2910 ) + baryon newly seen by Belle Collaboration and its possible bottom partner

Abstract

Abstract The developments in the experimental facilities and analyses techniques have recently lead to the observation of many hadronic states ranging from excitations of conventional hadrons to various exotic states. The baryons with single heavy quark are among these states providing an attractive field of research to get a better understanding of the nonperturbative nature of the strong interaction. Recently, the Belle Collaboration announced observation of the state $$\Lambda _c(2910)^+$$ Λ c ( 2910 ) + with a mass $$2913.8\pm 5.6\pm 3.8~\textrm{MeV}/c^2$$ 2913.8 ± 5.6 ± 3.8 MeV / c 2 and width $$51.8\pm 20.0\pm 18.8~\textrm{MeV}$$ 51.8 ± 20.0 ± 18.8 MeV . In the present study, by the mass analyses of different excitations at $$\Lambda _c$$ Λ c channel and their comparison with existing experimental information, we find that the spin-parity of this newly found excited state is $$ J^P= \frac{1}{2}^-$$ J P = 1 2 - and it is a 2P state denoting by $$\Lambda _c(\frac{1}{2}^-,2P)$$ Λ c ( 1 2 - , 2 P ) . We predict its current coupling as well, which can be served as one of the main input parameters to investigate different decays and interactions of this particle. We also determine the mass and current coupling of $$\Lambda _b(\frac{1}{2}^-,2P)$$ Λ b ( 1 2 - , 2 P ) as possible bottom counterpart of the new $$\Lambda _c(2910)^+$$ Λ c ( 2910 ) + state, which may be in agenda of different experiments in near future.