And Other Charmed Baryons Revisited (original) (raw)
Ωc and Other Charmed Baryons Revisited
1995
The mass of the 0 c baryon with quark content (ssc) is computed in a potential model whose parameters have been determined in 1981 by tting the spectrum of heavy mesons. It is found in perfect agreement with a recent measurement at the CERN hyperon-beam experiment. The spectroscopy of other charmed baryons in potential models is briey reviewed.
Heavy Baryons in a Quark Model
International Journal of Modern Physics A, 2008
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.
Light and heavy baryon masses: the 1/N_c expansion and the quark model
arXiv: High Energy Physics - Phenomenology, 2008
We establish a connection between the quark model and the 1/N_c expansion mass formulas used in the description of baryon resonances. We show that a remarkable compatibility exists between the two methods in the light and heavy baryon sectors. In particular, the band number used to classify baryons in the 1/N_c expansion is explained by the quark model and the mass formulas for both approaches are consistent.
Spectrum of strange singly charmed baryons in the constituent quark model
The European Physical Journal Plus
Excited states masses of the strange singly charmed baryons are calculated using the non-relativistic approach of hypercentral Constituent Quark Model (hCQM). The hyper-Coulomb plus screened potential is used as a confinement potential with the first order correction. The spin-spin, spinorbit and spin-tensor interaction terms are included perturbatively. Our calculated masses are allowed to construct the Regge trajectories in both (n r , M 2) and (J, M 2) planes. The mass spectra and the Regge trajectories study predict the spin-parity of Ξ c (2970) +/0 , Ξ c (3080) +/0 , Ξ c (3123) + , Ω c (3000) 0 and Ω c (3119) 0 baryons. Moreover, the strong one pion decay rates of the isodoublet states of Ξ c (2645), Ξ c (2790) and Ξ c (2815) are analyzed in the framework of Heavy Hadron Chiral Perturbation Theory (HHChPT). Also, the ground state magnetic moments and the radiative decay rates based on the transition magnetic moments are calculated in the framework of constituent quark model.
Towards an understanding of heavy baryon spectroscopy
The European Physical Journal A, 2008
The recent observation at CDF and D0 of Σ b , Σ * b and Ξ b baryons opens the door to the advent of new states in the bottom baryon sector. The states measured provide sufficient constraints to fix the parameters of phenomenological models. One may therefore consistently predict the full bottom baryon spectra. For this purpose we have solved exactly the three-quark problem by means of the Faddeev method in momentum space. We consider our guidance may help experimentalists in the search for new bottom baryons and their findings will help in constraining further the phenomenological models. We identify particular states whose masses may allow to discriminate between the dynamics for the light-quark pairs predicted by different phenomenological models. Within the same framework we also present results for charmed, doubly charmed, and doubly bottom baryons. Our results provide a restricted possible assignment of quantum numbers to recently reported charmed baryon states. Some of them are perfectly described by D−wave excitations with J P = 5/2 + , as the Λ c (2880), Ξ c (3055), and Ξ c (3123).
Progress in Particle and Nuclear Physics, 1994
We review the experimental and theoretical status of baryons containing one heavy quark. The charm and bottom baryon states are classified and their mass spectra are listed. The appropriate theoretical framework for the description of heavy baryons is the Heavy Quark Effective Theory, whose general ideas and methods are introduced and illustrated in specific examples. We present simple covariant expressions for the spin wave functions of heavy baryons including p-wave baryons. The covariant spin wave functions are used to determine the Heavy Quark Symmetry structure of flavour-changing current-induced transitions between heavy baryons as well as one-pion and one-photon transitions between heavy baryons of the same flavour. We discuss 1/m Q corrections to the current-induced transitions as well as the structure of heavy to light baryon transitions. Whenever possible we attempt to present numbers to compare with experiment by making use of further model-dependent assumptions as e.g. the constituent picture for light quarks. We highlight recent advances in the theoretical understanding of the inclusive decays of hadrons containing one heavy quark including polarization. For exclusive semileptonic decays we discuss rates, angular decay distributions and polarization effects. We provide an update of the experimental and theoretical status of lifetimes of heavy baryons and of exclusive nonleptonic two body decays of charm baryons.
Charmed-baryon electromagnetic mass differences
Lettere Al Nuovo Cimento Series 2, 1977
In previous calculations of the masses of charmed baryons by 5akimow and Kalman (1,~) and by Kalman (s) the mass of each baryon was given by (1) where Co, C1, C2 and C3 are all constants. It was then assumed that since the masses of the u and d quarks are much smaller than those of the s and e quarks, the last two terms are expected to be small and could be ignored. In this paper these terms are explicitly calculated. The effect is to renormalize the masses of all the mesons without changing the results of the previous calculations and to split the isoplets. A calculation of isoplet mass splittings was made by Kalman (4) for charm-zero baryons. In that paper, in addition to the Coleman-Glashow relation, two mass sum rules were obtained for JP= 89 baryons consistent within 10% of the experimental values. Correspondingly, based on eq. ( ) one obtains the Coleman-Glashow relation and the mass relations for charmed baryons obtained by Franklin (s) and three other mass sum rules. However, one of these relations is not consistent with experimental values. This is not unexpected, since no interactions between the quarks is included in eq. ( ). Following LICHTEN-BERG (e,v) and ITOH, MINA~IKAWA, MIURA and WATANAB]~ (s) a Coulomb and magnetic (*)