Heavy Baryons in a Quark Model

Abstract

A quark model is applied to the spectrum of baryons containing heavy quarks. The model gives masses for the known heavy baryons that are in agreement with experiment, but for the doubly-charmed baryon Ξcc, the model prediction is too heavy. Mixing between the ΞQ and Ξ′Q states is examined and is found to be small for the lowest lying states. In contrast with this, mixing between the Ξbc and Ξ′bc states is found to be large, and the implication of this mixing for properties of these states is briefly discussed. We also examine heavy-quark spin-symmetry multiplets, and find that many states in the model can be placed in such multiplets. We compare our predictions with those of a number of other authors.

Hyperfine mixing in semileptonic decay of doubly heavy baryons

“…We also show the results obtained by Roberts and Pervin in Ref. [15]. They use a non-relativistic approach in which the orbital wave functions are expanded in a harmonic oscillator basis.…”

“…Roberts and Pervin [15] have taken up the hyperfine mixing issue again, pointing out that it could greatly affect the decay widths of doubly heavy baryons. In Ref.…”

“…Following their own suggestion in Ref. [15], Roberts and Pervin have conducted a calculation in which they find that hyperfine mixing in the bc states has a tremendous impact on doubly heavy baryon b → c semileptonic decay widths [17]. In fact this kind of information was partially available in the literature.…”

Holographic heavy quark symmetry

“…In the case of mesons, experimental results show small mass splittings between pseudo-scalar mesons with spin-0 and vector mesons with spin-1, e.g., the mass splitting of BB * (∼45 MeV) in the bottom quark sector is much smaller than that of KK * (∼ 400 MeV) in the strange quark sector. The mass degeneracy is also realized in the heavy baryons [13] and is expected in the multi-hadron states such as hadronic molecules and heavy mesonic nuclei [14,15]. Furthermore, the heavy quark spin symmetry affects the heavy hadron decays and productions [10,12,[16][17][18].…”

Measurements of the properties ofΛc(2595),Λc(2625),Aaltonen1, González2, Amerio3 et al. 2011Phys. Rev. D560320View full textAdd to dashboardCite

“…[6] uses lattice QCD, Refs. [7][8][9] are based on the quark model, Ref. [10] employs QCD sum rules and Ref.…”