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Searching for the quark--diquark systematics of baryons composed by light quarks $q=u,d$ | A.V. Anisovich
; V.V. Anisovich
; M.A. Matveev
; V.A. Nikonov
; A.V. Sarantsev
; T.O. Vulfs
; | Date: |
8 Jan 2010 | Abstract: | Supposing quark--diquark structure of baryons, we look for systematics of
baryons composed of light quarks ($q=u,d$). We systematize baryons using the
notion of two diquarks: (i) axial--vector state, $D^{1}_{1}$, with the spin
$S_D=1$ and isospin $I_D=1$ and (ii) scalar one, $D^{0}_{0}$, with the spin
$S_D=0$ and isospin $I_D=0$. We consider several schemes for the composed
baryons: (1) with different diquark masses, $M_{D^0_0}
e M_{D^1_1}$, (2) with
$M_{D^0_0} = M_{D^1_1}$ and overlapping $qD^0_0$ and $qD^1_1$ states
(resonances), (3) with/without SU(6) constraints for low-lying states (with
quark--diquark orbital momenta L=0). In the high-mass region the model predicts
several baryon resonances at $Msim 2.0-2.9$ GeV. Moreover, the model gives us
the double pole structure (i.e. two poles with the same Re$M$ but different
Im$M$) in many amplitudes at masses $Mga 2.0$ GeV. We see also that for
description of low-lying baryons (with L=0), the SU(6) constraint is needed. | Source: | arXiv, 1001.1259 | Services: | Forum | Review | PDF | Favorites |
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