Spectrum of heavy baryons in the quark model

Abstract

Single-and double-heavy baryons are studied in the constituent quark model. The model Hamiltonian is chosen as a standard one with two exceptions : (1) The color-Coulomb term depend on quark masses, and (2) an antisymmetric LS force is introduced. Model parameters are fixed by the strange baryon spectra, Λ and Σ baryons. The masses of the observed charmed and bottomed baryons are, then, fairly well reproduced. Our focus is on the low-lying negative-parity states, in which the heavy baryons show specific excitation modes reflecting the mass differences of heavy and light quarks. By changing quark masses from the SU(3) limit to the strange quark mass, further to the charm and bottom quark masses, we demonstrate that the spectra change from the SU(3) symmetry patterns to the heavy quark symmetry ones.

Excited state mass spectra of doubly heavy $$\Xi $$ Ξ baryons

“…The spin-dependent part, A→without first order correction, B→with first order correction calculations. In the case of bb baryon, our ground state results (both parities) are matched (with [9,18]) very well. Our predicted ground states of bc are very close to Refs.…”

“…It is yet to be confirmed from the other experiments [5][6][7][8]. Recently, the Hamiltonian model [9], Regge phenomenology [10,11], lattice QCD [12][13][14][15], QCD sum rules [16,17], the variational approach [18], and many more [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] have provided new results in the field of doubly heavy baryons. Many of them have only calculated the ground state masses, while some of them have also shown the excited states.…”

Three-Body Decay of Λc*(2595) and Λc*(2625Arifi1, Nagahiro2 2017Phys. Rev. DSelf Cite192270View full textAdd to dashboardCite

“…The Λ * c (2595) → Λ c (2286)ππ decay channel is the only possible strong decay [11,12]. Due to different excitation energies between the λ and ρ mode excitations, this state is expected to be dominated by the λ mode [13]. Here, we consider decays of both the λ and ρ modes to discuss the structure of Λ * c (2595) from the view point of the decay property.…”

Very narrow excited Ωc baryons

“…Predictions of ∼ 3000 ± 40 MeV for the negative-parity Ω c states, and an analogous range for the Ω b states, have been made by several authors [10,[15][16][17][18][19][20][21][22][23][24][25][26][27]. (The last paper treats only 2S levels, identifying the states at 3066, 3119 MeV as candidates for J P = 1/2 + , 3/2 + , respectively.…”