| 1. |
- Anselmino, Mauro
(författare)
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Diquarks
- 1992
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Rapport (övrigt vetenskapligt/konstnärligt)
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| 2. |
- Anselmino, Mauro, et al.
(författare)
-
Diquarks
- 1993
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Ingår i: Reviews of Modern Physics. - 0034-6861 .- 1539-0756. ; 65:4, s. 1199-1233
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Tidskriftsartikel (refereegranskat)abstract
- 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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| 3. |
- Anselmino, Mauro, et al.
(författare)
-
Polarized inclusive leptoproduction, lN→hX, and the hadron helicity density matrix ρ(h) : Possible measurements and predictions
- 1996
-
Ingår i: Physical Review D. Particles and fields. - 0556-2821 .- 1089-4918. ; 54:1, s. 828-837
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Tidskriftsartikel (refereegranskat)abstract
- We discuss the production of hadrons in polarized lepton-nucleon interactions and in the current jet fragmentation region; using the QCD hard scattering formalism we compute the helicity density matrix of the hadron and show how its elements, when measurable, can give information on the spin structure of the nucleon and the spin dependence of the quark fragmentation process. The cases of ρ vector mesons and Λ baryons are considered in more detail and, within simplifying assumptions, some estimates are given
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