Diquarks

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · Reviews of Modern Physics; (United States)

DOI:https://doi.org/10.1103/RevModPhys.65.1199· OSTI ID:5686180

Anselmino, M; Predazzi, E ^[1]; Ekelin, S ^[2]; Fredriksson, S ^[3]; Lichtenberg, D B ^[4]

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1. Dipartimento di Fisica Teorica, Universita di Torino and Istituto Nazionale di Fisica Nucleare, Sezione di Torino, I-10125 Torino (Italy)
2. Department of Mathematics, Royal Institute of Technology, S-100 44 Stockholm (Sweden)
3. Department of Physics, Lulea University of Technology, S-97187 Lulea (Sweden)
4. Department of Physics, Indiana University, Bloomington, Indiana 47405 (United States)

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 [ital e][sup +][ital e[minus]] 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.

• OSTI ID: 5686180
• Journal Information: Reviews of Modern Physics; (United States), Journal Name: Reviews of Modern Physics; (United States) Vol. 65:4; ISSN RMPHAT; ISSN 0034-6861
• Country of Publication: United States
• Language: English

Related Subjects

662240* -- Models for Strong Interactions-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BASIC INTERACTIONS
BOSONS
COMPOSITE MODELS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MATHEMATICAL MODELS
MATTER
MESONS
NUCLEAR MATTER
PARTICLE INTERACTIONS
PARTICLE MODELS
POSTULATED PARTICLES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
QUARKS
STRONG INTERACTIONS
SUPERSYMMETRY
SYMMETRY