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A study of semi-inclusive deep inelastic scattering off transversely polarized 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 parameterizations 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 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 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. * sergio.scopetta@pg.infn.it

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“…defined in terms of the components of the spin-dependent spectral function of the nucleon N in the 3 He nucleus, firstly defined in [16]:…”

Section: Sidis and Single Spin Asymmetriesmentioning

confidence: 99%

Neutron single spin asymmetries from semi-inclusive deep inelastic scattering off transversely polarizedHe3

Scopetta

2007

Phys. Rev. D

122

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“…The deviation of the result by Ishikawa e t al. [6] from those of PWIA calculations [24] [25] is significant away from the quasielastic peak. The agreement between the data on A-p(w) and the calculation by Ishikawa et al is excellent in terms of the magnitude of the asymmetry and also the shape.…”

Section: Spin-exchange Optical Pumpingmentioning

confidence: 90%

“…[6] The dashed line is the calculation by Salme e t al. [24]and the dash-dotted line is the calculation by Schulze et al [25] For inclusive quasielastic 3ffe(Z', e') process, the transverse asymmetry AT' can be written within PWIA as:…”

Section: Spin-exchange Optical Pumpingmentioning

confidence: 99%

Effective neutron targets

1998

Nuclear Physics A

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Because of the lack of a free neutron target, deuterium targets have been used extensively in studying the neutron structure. The unique spin structure of the 3He ground state wave function and the recent developments in laser technologies made polarized 3He targets widely used in many experiments from neutron electromagnetic form factor studies to nucleon spin structure function measurements at all major electron accelerator facilities. In this talk, the current status of the polarized 3He targets will be reviewed. I will focus on neutron electromagnetic form factor studies using polarized 3He targets. The polarized nucleon spin structure function measurements using polarized 3He targets will also be discussed.

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“…Dynamical nuclear effects in inclusive deep inelastic electron scattering 3 → He(e, e ′ )X (DIS) were evaluated [15] with a realistic 3 → He spin-dependent spectral function, P τ σ,σ′ (p, E, S He ), with p the initial nucleon momentum in the laboratory frame and E the missing energy [16]. It was found that the formula…”

Section: Polarized 3 He Target As a Polarized Neutron Targetmentioning

confidence: 99%

“…In such a framework, SSAs for 3 He involve convolutions of P τ σ,σ ′ (p, E, S He ), with TMDs and fragmentation functions. Ingredients of the calculations were: i) a realistic P τ σ,σ ′ (p, E, S He ) for 3 He [16], obtained using the AV18 interaction; ii) parametrizations of data for TMDs and ff, whenever available; iii) models for the unknown TMDs and ff. As shown in Fig.…”

Section: Polarized 3 He Target As a Polarized Neutron Targetmentioning

confidence: 99%

Transverse momentum distributions and nuclear effects

Pace

Dotto

Kaptari

et al. 2015

EPJ Web of Conferences

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Abstract. A distorted spin-dependent spectral function for 3 He is considered to take care of the final state interaction in the extraction of the quark transverse-momentum distributions in the neutron from semi-inclusive deep inelastic electron scattering off polarized 3 He at finite momentum transfers. The generalization of the analysis in a Poincaré covariant framework within the light-front dynamics is outlined. The definition of the light-front spin-dependent spectral function for a J=1/2 system, as the nucleon, allows us to show that within the light-front dynamics and in the valence approximation only three of the six leading twist T-even transversemomentum distributions are independent.

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Spin dependent spectral function ofHe3and the asymmetry in the processe<

Cited by 115 publications

References 14 publications

Neutron single spin asymmetries from semi-inclusive deep inelastic scattering off transversely polarizedHe3

Neutron single spin asymmetries from semi-inclusive deep inelastic scattering off transversely polarizedHe3

Effective neutron targets

Transverse momentum distributions and nuclear effects

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