Investigation of varXi _c^0 in a chiral quark model

Abstract

Recently, three new states of varXi _c^0 were observed in the invariant mass spectrum of varLambda ^+_cK^- by LHCb collaboration. In this work, we use a chiral quark model to investigate these three exited states with the help of Gaussian expansion method both in three-quark structure and in five-quark structure with all possible quantum numbers IJ^P=frac{1}{2}(frac{1}{2})^-, frac{1}{2}(frac{3}{2})^-, frac{1}{2}(frac{5}{2})^-, frac{3}{2}(frac{1}{2})^-, frac{3}{2}(frac{3}{2})^- and frac{3}{2}(frac{5}{2})^- . The calculations shows that the masses of 2S and 1D states of varXi _c are comparable to experimental results; In addition, the resonance states of five-quark configuration are possible candidates of these new states with negative parity by using the real scaling method and their decay width is also given.