Searching for the quark--diquark systematics of baryons composed by light quarks $q=u,d$

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, $M_{D_0^0}\ne M_{D_1^1}$, (2) with $M_{D_0^0}=M_{D_1^1}$ and overlapping $q{D}_0^0$ and $q{D}_1^1$ 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 $M\sim 2.0-2.9$ 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 $M\ga 2.0$ GeV. We see also that for description of low-lying baryons (with L=0), the SU(6) constraint is needed.

30 pages, 9 figures

References in corpus (20)

• Extended Partial-Wave Analysis of piN Scattering Data
• Unified description of light- and strange-baryon spectra
• Systematics of q anti-q states in the (n,M^2) and (J,M^2) planes
• The light baryon spectrum in a relativistic quark model with instanton-induced quark forces I. The non-strange baryon spectrum and ground-states
• The light baryon spectrum in a relativistic quark model with instanton-induced quark forces II. The strange baryon spectrum
• Baryon Resonance Extraction from piN Data using a Unitary Multichannel Model
• Photoproduction of eta mesons off protons for photon energies from 0.75 GeV to 3 GeV
• Decays of Baryon Resonances into K Lambda, K^+ Sigma^0 and K^0 Sigma^+
• pi N --> eta N and eta N --> eta N partial wave T-matrices in a coupled, three channel model
• New results on the Roper resonance and the P_{11} partial wave
• N* and Delta* decays into N pi0 pi0
• Baryon resonances and polarization transfer in hyperon photoproduction
• Study of the reaction $\gamma p\to p{\pi }^0\eta$
• Photoproduction of $\eta$ mesons off neutrons from a deuteron target
• Evidence for a parity doublet Delta(1920)P_{33} and Delta(1940)D_{33}$ from γp\to pπ^0η
• Measurements of the continuum $R_{\mathrm{uds}}$ and $R$ values in $e^{+}{e}^{-}$ annihilation in the energy region between 3.650 and 3.872 GeV
• $0^{++}$-Glueball/$q\bar{q}$-State Mixing in the Mass Region near 1500 MeV
• Scalar glueball: analysis of the (IJ^{PC}=00^{++})-wave
• Exotic mesons, locking states and their role in the formation of the confinement barrier
• K-Matrix Analysis of the (${IJ}^{PC}=00^{++}$) Amplitude in the Mass Region up to 1550 MeV

Cited by in corpus (14)

• Strange and nonstrange baryon spectra in the relativistic interacting quark-diquark model with a Gürsey and Radicati-inspired exchange interaction
• Strange baryon spectroscopy in the relativistic quark model
• Non-strange and strange pentaquarks with hidden charm
• Deciphering the nature of X(3872) in heavy ion collisions
• Nucleon resonances in the fourth resonance region
• Gravitational form factors and angular momentum densities in light-front quark-diquark model
• Relativistic quark-diquark model of baryons with a spin-isospin transition interaction
• Evidence for a spin-quartet of nucleon resonances at 2\,GeV
• Exotic mesons with hidden charm as diquark-antidiquark states
• Narrow pentaquarks as diquark-diquark-antiquark systems
• String Model with Mesons and Baryons in Modified Measure Theory
• New narrow LHCb pentaquarks as lowest antiquark-diquark-diquark systems
• Diquark correlations in baryons: the Interacting Quark Diquark Model
• Strange and nonstrange baryon spectra in the interacting quark-diquark model