Transversity and Collins functions from SIDIS and e{sup +}e{sup -} data
- Dipartimento di Fisica Teorica, Universita di Torino and INFN, Sezione di Torino, Via P. Giuria 1, I-10125 Turin (Italy)
- Dipartimento di Fisica, Universita di Cagliari and INFN, Sezione di Cagliari, C.P. 170, I-09042 Monserrato (Italy)
- Yerevan Physics Institute, 375036 Yerevan (Armenia)
A global analysis of the experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS), from the HERMES and COMPASS Collaborations, and in e{sup +}e{sup -}{yields}h{sub 1}h{sub 2}X processes, from the Belle Collaboration, is performed. It results in the extraction of the Collins fragmentation function and, for the first time, of the transversity distribution function for u and d quarks. These turn out to have opposite signs and to be sizably smaller than their positivity bounds. Predictions for the azimuthal asymmetry A{sub UT}{sup sin({phi}{sub S}+{phi}{sub h})}, as will soon be measured at JLab and COMPASS operating on a transversely polarized proton target, are then presented.
- OSTI ID:
- 21020079
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 75, Issue 5; Other Information: DOI: 10.1103/PhysRevD.75.054032; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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