Diquark clustering and the neutron charge radius

Dziembowski, Zbigniew; Metzger, W. J.; Walle, R. T. Van de

doi:10.1007/bf01549731

Cited by 23 publications

(20 citation statements)

References 22 publications

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“…The negative charge radius of the neutron has been suggested as an indication of a scalar diquark clustering in the nucleon [18] and our treatment dynamically manifests this assertion. These numbers point to a physical picture of a "heavy" diquark at the center with a quark rotating around it.…”

Section: Numerical Studysupporting

confidence: 71%

The Nucleon and the Nuclear Force: Effective Theory and Path-Integral Methods

Abu‐Raddad¹

2002

AIP Conference Proceedings

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Abstract. The nucleon structure and the nuclear force are investigated in the context of the nonperturbative path-integral method of hadronization. Starting from a microscopic quark-diquark model, the nucleon is generated as a relativistic bound state and an effective chiral meson-nucleon Lagrangian is derived. Many of the nucleon physical properties are studied using a theory of at most two free parameters.

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Section: Numerical Studysupporting

confidence: 71%

The Nucleon and the Nuclear Force: Effective Theory and Path-Integral Methods

Abu‐Raddad¹

2002

AIP Conference Proceedings

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“…Actually, the three-quark proton wave functions needed to obtain good agreement with the data for G& show a strong asymmetry in the sharing of the proton momentum by the quarks. Such asymmetries follow from QCD sum rules (Chernyak and I. R. Zhitnitsky, 1984), but are also given by diquark clustering (Dziembowski and Franklin, 1990). In addition, the proton electric form factor G£ and the neutron form factors GM and G% have been predicted, but the present data do not yet lead to unambiguous conclusions (see, however, Kroll et aL, 1991a).…”

Section: B Spin Problems and The Diquark Solutionmentioning

confidence: 56%

“…This work presents a unified picture of lowenergy and high-energy properties of the nucleon in terms of a quark-diquark picture. Dziembowski's paper is related to the earlier work of Franklin (1980), Close and Thomas (1988), and Dziembowski and Franklin (1990).…”

Section: A General Featuresmentioning

confidence: 90%

“…One feature of these papers is that the same constituent-quark wave functions that are used to calculate baryon masses also describe deep-inelastic lepton-nucleon scattering. This idea was carried further by Dziembowski and Franklin (1990; see also Dziembowski, 1993). The calculations show that the mean distance between a u and a d quark in a nucleon is somewhat smaller than the mean distance between two like quarks.…”

Section: Baryon Static Propertiesmentioning

confidence: 95%

“…These wave functions, which are related to wave functions written down in the SU(6) formalism by Isgur and Karl (1980), can be used to calculate baryon properties. The inclusion of diquarks usually has a small influence on baryon masses but can strongly affect other static properties of baryons, such as magnetic moments (Isgur, 1977;Isgur and Karl, 1980), the ratio of the axial vector to vector coupling constants in /3 decay (Isgur, 1977), and the neutron charge radius (Carlitz et al, 1977;Isgur, 1977;Dziembowski et al, 1981;Isgur et al, 1981;Dziembowski, 1993). The simple quark model gives good qualitative results for the magnetic moments of baryons, but there are quantitative discrepancies with the data, of up to 0.2fi N (fi N denotes nuclear magnetons).…”

Section: Baryon Static Propertiesmentioning

confidence: 99%

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Diquarks

et al. 1993

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It is becoming increasingly clear that the concept of a diquark (a two-quark system) is important for understanding hadron structure and high-energy particle reactions. According to our present knowledge of quantum chromodynamics (QCD), diquark correlations arise in part from spin-dependent interactions between two quarks, from quark radial or orbital excitations, and from quark mass differences. Diquark substructures affect the static properties of baryons and the mechanisms of baryon decay. Diquarks also play a role in hadron production in hadron-initiated reactions, deep-inelastic lepton scattering by hadrons, and in e + e~ reactions. Diquarks are important in the formation and properties of baryonium and mesonlike semistable states. Many spin effects observed in high-energy exclusive reactions pose severe problems for the pure quark picture of baryons and might be explained by the introduction of diquarks as hadronic constituents. There is considerable controversy, not about the existence of diquarks in hadrons, but about their properties and their effects. In this work a broad selection of the main ideas about diquarks is reviewed.

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