q→Λ fragmentation function and nucleon transversity distribution in a diquark model
✍ Scribed by Jian-Jun Yang
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 180 KB
- Volume
- 699
- Category
- Article
- ISSN
- 0375-9474
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✦ Synopsis
Based on a simple quark-diquark model, we propose a set of unpolarized, longitudinally polarized and transversely polarized fragmentation functions for the by fitting the unpolarized production data in e + e -annihilation. It is found that the helicity structure of the obtained fragmentation functions is supported by the all available experimental data on the longitudinal polarization. Within the same framework of the diquark model, the nucleon transversity distributions are presented and consistent descriptions of the available HERMES data on the azimuthal spin asymmetries in pion electroproduction are obtained. Furthermore, the spin transfers to the transversely polarized in the charged-lepton DIS on a transversely polarized nucleon target are predicted for future experiments.