Nc limit of spin-flavor breaking in excited baryon levels
نویسندگان
چکیده
منابع مشابه
Orbitally Excited Baryon Spectroscopy in the 1/nc Expansion
The discussion of the 70-plet of negative parity baryons illustrates the large Nc QCD approach to orbitally excited baryons. In the case of the ` = 1 baryons the existing data allows to make numerous predictions to first order in the SU(3) symmetry breaking. New relations between splittings are found that follow from the spin-flavor symmetry breaking. The Λ(1405) is well described as a three-qu...
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Spin-flavor symmetry breaking in the levels of excited Baryons are studied to leading order in the 1/N c expansion. This breaking occurs at zeroth order. For non-strange Baryons with a single quark excited, it is shown that to first order of perturbation theory the breaking is given by one 1-body operator (spin-orbit), and three 2-body operators, all involving the orbital angular momentum of th...
متن کاملExcited heavy baryon spectrum in large N c heavy quark effective theory
L = 1 excited heavy baryon masses are analyzed by heavy quark and large Nc expansions. In heavy quark limit, mass is parameterized by Λ̄ and it is expanded further by spin-flavor breaking operators to the zeroth order of 1/Nc. Expanding coefficients will be fixed by more data on the excited baryons in the near future. Typeset using REVTEX Email address: [email protected] Email address: liuc@c...
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It is shown that a perturbative QCD (pQCD) based analysis and the SU(6) quarkdiquark model give significant different predictions concerning the flavor and spin structure for the quark distributions of the Λ-baryon near x = 1. Detailed predictions for the ratios u(x)/s(x) of unpolarized quark distributions, ∆s(x)/s(x) of valence strange quark, and ∆u(x)/u(x) of valence up and down quarks of the...
متن کاملCharm and bottom baryon masses in the 1/N expansion
The 1/Nc expansion has proven useful for studying the spin-flavor properties of baryons containing light quarks. A spin-flavor symmetry for baryons is defined in large-Nc QCD. Away from the Nc → ∞ limit, 1/Nc corrections which break large-Nc baryon spin-flavor symmetry can be classified in terms of the spin and flavor symmetries which remain for finite Nc. Since explicit SU(3) flavor symmetry b...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1997
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(97)01154-4