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Título: | Neutron single spin asymmetries from semi-inclusive deep inelastic scattering off transversely polarized He-3 |
Autor: | Scopetta, Sergio | Palabras clave: | Semi-inclusive interactions Deep inelastic scattering Nuclear polarisation Polarisation in elementary particle interactions Tritons Nuclear fragmentation Parton model Baryon spin Neutrons |
Fecha de publicación: | mar-2007 | Editor: | American Physical Society | Citación: | Physical Review D 75(5): 054005 (2007) | Resumen: | A study of semi-inclusive deep inelastic scattering off transversely polarized He-3 is presented. The formal expressions of the Collins and Sivers contributions to the azimuthal single spin asymmetry for the production of leading pions are derived, in impulse approximation, and estimated in the kinematics of forth-coming experiments at JLab. The AV18 interaction has been used for a realistic description of the nuclear dynamics; the nucleon structure has been described by proper parametrizations of data or suitable model calculations. The initial transverse momentum of the struck quark has been properly included in the calculation. The crucial issue of extracting the neutron information from He-3 data, planned to shed some light on the puzzling experimental scenario arisen from recent measurements for the proton and the deuteron, is thoroughly discussed. It is found that a model independent procedure, widely used in inclusive deep inelastic scattering to take into account the momentum and energy distributions of the bound nucleons in He-3, can be applied also in the kinematics of the planned JLab experiments, although fragmentation functions, not only parton distributions, are involved. The possible role played by final state interactions in the process under investigation is addressed. | Descripción: | 10 pages, 3 figures.-- PACS nrs.: 13.60.Hb, 13.85.Hd, 13.85.Ni, 13.87.Fh.-- ISI Article Identifier: 000245333000018.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-ph/0612354 | Versión del editor: | http://dx.doi.org/10.1103/PhysRevD.75.054005 | URI: | http://hdl.handle.net/10261/9117 | DOI: | 10.1103/PhysRevD.75.054005 | ISSN: | 1550-7998 |
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