ar X iv : h ep - p h / 96 12 25 2 v 2 2 1 Ju l 1 99 7 Large N c Limit of Spin - Flavor Breaking in Excited Baryon Levels
نویسنده
چکیده
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 the excited quark. Higher-body operators can be reduced to that set of operators. As illustration, p-wave Baryons are briefly discussed.
منابع مشابه
X iv : h ep - p h / 96 12 25 2 v 1 4 D ec 1 99 6 Excited Baryon Spectroscopy in the Large N c Limit
The leading in 1/N c spin-flavor symmetry breaking mass splittings, of order N 0 c , in excited non-strange Baryons are shown to be given, up to two-body operators, by three different effective Hamiltonians: Thomas precession spin-orbit, spin-isospin tensor, and spin-orbit with isospin exchange. Explicit expressions for their matrix elements between low excited Baryons are obtained, and the str...
متن کاملar X iv : h ep - p h / 96 03 25 4 v 1 9 M ar 1 99 6 Sea contributions to spin 1 / 2 baryon structure and magnetic moments
We treat the baryon as a composite system made out of a " core " of three quarks (as in the standard quark model) surrounded by a " sea " (of gluons and q ¯ q-pairs) which is specified by its total quantum numbers like flavor, spin and color. Specifically, we assume the sea to be a flavor octet with spin 0 but no color. The general wavefunction for spin 1/2 baryons with such a sea component is ...
متن کاملar X iv : h ep - p h / 99 07 55 6 v 1 2 9 Ju l 1 99 9 USM - TH - 81 Flavor and Spin Structure of Octet Baryons at Large x
The quark flavor and spin distributions in octet baryons are calculated both in the SU(6) quark spectator diquark model and in a perturbative QCD (pQCD) based model. It is shown that the Λ has the most significant difference in flavor structure at large x between the two models, though the flavor and spin structure of other baryons can also provide tests of different models. The Drell-Yan proce...
متن کاملar X iv : h ep - p h / 02 07 37 2 v 1 3 1 Ju l 2 00 2 SU ( 3 ) MIXING FOR EXCITED MESONS
The SU(3)-flavor symmetry breaking and the quark-antiquark annihilation mechanism are taken into account for describing the singlet-octet mixing for several nonets assigned by Particle Data Group(PDG). This task is approached with the mass matrix formalism.
متن کاملar X iv : h ep - p h / 96 03 25 2 v 1 8 M ar 1 99 6 Sea contributions to spin 1 / 2 baryon structure , magnetic moments , and spin distribution
We treat the baryon as a composite system made out of a " core " of three quarks (as in the standard quark model) surrounded by a " sea " (of gluons and q ¯ q-pairs) which is specified by its total quantum numbers like flavor, spin and color. Specifically, we assume the sea to be a flavor octet with spin 0 or 1 but no color. The general wavefunction for spin 1/2 baryons with such a sea componen...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1997