ar X iv : h ep - p h / 03 01 16 7 v 2 24 J an 2 00 3 New Relations for Excited Baryons in Large N c QCD
نویسندگان
چکیده
We show that excited baryons in large Nc QCD form multiplets, within which masses are first split at O(1/Nc). The dominant couplings of resonances to various mesons are highly constrained: The N(1535) decays at leading 1/Nc order exclusively to η-N rather than π-N , and vice versa for the N(1650). This multiplet structure is reproduced by a simple large Nc quark model, well studied in the literature, that describes resonances as single-quark excitations.
منابع مشابه
ar X iv : h ep - p h / 01 03 16 9 v 1 1 5 M ar 2 00 1 Baryons with two heavy quarks
We consider general physical characteristics of doubly heavy baryons: the spectroscopy in the framework of potential approach and sum rules of QCD, mechanisms of production in various interactions on the basis of fragmentation model with account of preasymptotic corrections caused by higher twists over the transverse momentum of baryon, inclusive decays and lifetimes in the operator product exp...
متن کاملar X iv : h ep - p h / 00 03 13 7 v 2 1 7 M ar 2 00 0 Conformal Phase Transition , β - Function , and Infrared Dynamics in QCD
The dynamics in QCD with different number of fermion flavors N f is discussed. The emphasis is on the description of the conformal phase transition with respect to N f separating a phase with no confinement and chiral symmetry breaking and a phase with confinement and with chiral symmetry breaking.
متن کاملar X iv : h ep - p h / 01 10 03 9 v 1 3 O ct 2 00 1 On spectroscopy of ρ ′ , ρ ′ ′ and ω ′ , ω ′ ′ resonances
متن کامل
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
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 کاملar X iv : h ep - p h / 06 06 03 7 v 2 3 O ct 2 00 6 Two - Jet Inclusive Cross Sections in Heavy - Ion Collisions in the Perturbative QCD
In the framework of perturbative QCD, double inclusive cross sections for high pt parton production in nucleus-nucleus collisions are computed with multiple rescattering taken into account. The induced long-range correlations between numbers of jets at forward and backward rapidities are found to reach 10÷ 20% for light nuclei at √ s = 200 GeV/c and to be suppressed for heavy nuclei and LHC ene...
متن کامل