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Constituent Quarks as Clusters in Quark-Gluon-Parton Model

1976; Oxford University Press; Volume: 56; Issue: 6 Linguagem: Inglês

10.1143/ptp.56.1885

1347-4081

Takeshi Kanki,

Particle physics theoretical and experimental studies

We present a quark-gluon-parton model in which quark-partons and gluons are making clusters as corresponding to two or three constituent quarks (or anti-quarks) in the meson or in the baryon, respectively. We explicitly construct the constituent quark state (cluster), by employing the Kuti-Weisskopf theory and by requiring the scaling. The quark additivity of the hadronic total cross sections and the quark counting rules on the threshold powers of various distributions are satisfied. For small x (Feynman fraction), it is shown that the constituent quarks and quark-partons have quite different probability distributions. We apply our model to hadron-hadron inclusive reactions, and clarify that the fragmentation and the diffractive processes relate to the constituent quark distributions, while the processes in or near the central region are controlled by the quark-partons. Our model gives the reasonable interpretation for the experimental data and much improves the usual “constituent interchange model” result near and in the central region (x≈xT≈0).