Dynamical study of Ωc0 in the chiral quark model

Abstract

Recently, the experimental results of the LHCb Collaboration suggested the existence of five new excited states of Ω 0 c : Ω c ð3000Þ 0 , Ω c ð3050Þ 0 , Ω c ð3066Þ 0 , Ω c ð3090Þ 0 , and Ω c ð3119Þ 0 ; however, the quantum numbers of these new particles are not determined now. To understand the nature of these states, a dynamical calculation of Ω 0 c both in five-quark configuration with quantum numbers IJ P ¼ 0ð 1 2 Þ − , 0ð 3 2 Þ − , 0ð 5 2 Þ − and in three-quark configuration with positive parity and negative parity was performed in the framework of the chiral quark model with the help of the Gaussian expansion method. The results show the masses both of the 1P and the 2S states in ssc systems are comparable to experimental data; Besides, ΞD, Ξ cK , and Ξ Ã cK are also possible candidates of these new particles if the parity is negative. The distances between quark pairs suggest a compact structure nature.

Double-heavy tetraquarks

“…One needs to mention that the chiral quark-(anti)quark interaction plays a role only between two light quarks, and it is invalid for the other heavy-light and heavy-heavy quark pairs due to the isospin symmetry breaking. The model parameters which are listed in Table I have been fixed in advance reproducing hadron [8,[70][71][72][73][74], hadron-hadron [76][77][78][79][80], and multiquark [81][82][83][84] phenomenology.…”

“…15 and 16 in Ref. [69]), and the chiral quark model, which has been successfully applied to hadron [8,[70][71][72][73][74][75], hadron-hadron [76][77][78][79][80], and multiquark [81][82][83][84] phenomenology. However, due to the complexity of the coupled-channel case for scattering and resonance states, it is difficult to solve a scattering issue together with a resonance one.…”

Ωb−→(Ξc+K−)π−Debastiani1, Dias2, Wu3 et al. 2018Phys. Rev. D12210View full textAdd to dashboardCite

“…Pentaquark options have been suggested in Refs. [29][30][31][32][33][34]. Some works have emphasized the value of decay properties to obtain information on the nature of these states [35][36][37], and a discussion on the possible quantum numbers was given in Ref.…”

Excited $$\varOmega _b$$ baryons and fine structure of strong interaction

“…These excited Ω c and Ω b states are good candidates of Pwave charmed and bottom baryons. To understand them, many phenomenological methods and models have been applied, such as various quark models [13][14][15][16][17][18][19][20][21][22][23][24][25][26], the chiral perturbation theory [27,28], the molecular model [29][30][31][32][33][34][35][36], Lattice QCD [37,38], and QCD sum rules [39][40][41][42][43][44][45][46][47][48][49][50][51], etc. We refer to reviews [7,[52][53][54] and references therein for their recent progress.…”