Neutron single spin asymmetries from semi-inclusive deep inelastic scattering off transversely polarized {sup 3}He

Journal Article · Thu Mar 01 00:00:00 EST 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.054005· OSTI ID:21020052

Scopetta, Sergio ^[1]

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1. Dipartimento di Fisica, Universita degli Studi di Perugia, and INFN, sezione di Perugia via A. Pascoli 06100 Perugia (Italy) and Departament de Fisica Teorica, Universitat de Valencia, 46100 Burjassot (Valencia) (Spain)

A study of semi-inclusive deep inelastic scattering off transversely polarized {sup 3}He 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 {sup 3}He 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 {sup 3}He, 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.

• OSTI ID: 21020052
• Journal Information: Physical Review. D, Particles Fields, Vol. 75, Issue 5; Other Information: DOI: 10.1103/PhysRevD.75.054005; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
CEBAF ACCELERATOR
DEEP INELASTIC SCATTERING
DEUTERONS
ENERGY SPECTRA
FINAL-STATE INTERACTIONS
HELIUM 3
IMPULSE APPROXIMATION
NEUTRONS
NUCLEAR FRAGMENTATION
PARTICLE PRODUCTION
PARTICLE STRUCTURE
PIONS
POLARIZATION
PROTONS
QUARKS
SEMI-INCLUSIVE INTERACTIONS
SPIN
TRANSVERSE MOMENTUM
TRITONS