Neutron electromagnetic form factors and inclusive scattering of polarized electrons by polarized 3He and 3H targets

Kievsky, A.; Pace, E.; Salmè, G.; Viviani, M.

doi:10.1103/physrevc.56.64

Cited by 72 publications

(134 citation statements)

References 28 publications

(63 reference statements)

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“…This has been done along the line of Ref. [25], using the overlaps calculated in [27] by means of a wave function obtained by the method of Ref. [28].…”

Section: Resultsmentioning

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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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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“…This has been done along the line of Ref. [25], using the overlaps calculated in [27] by means of a wave function obtained by the method of Ref. [28].…”

Section: Resultsmentioning

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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“…Since our investigation in [190] was restricted to the nonrelativistic domain, it does not provide information for the relativistic region. In [148,191] the spectral function concept has been studied at higher ω and | Q |-values. The verification of such an assumption requires a full-fledged relativistic framework including on top of FSI 3N forces and MEC's.…”

Section: Semiexclusive Nucleon Knockout Processesmentioning

confidence: 99%

“…This work uses the concept of the spin dependent spectral function of the three-body system and employs realistic forces [148]. The polarized responses R T L ′ and R T ′ were evaluated with the aim to minimize the model dependence in the extraction of the neutron electromagnetic form factors.…”

Section: Comparison With Datamentioning

confidence: 99%

Electron and photon scattering on three-nucleon bound states

et al. 2005

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A big spectrum of processes induced by real and virtual photons on the 3 He and 3 H nuclei is theoretically investigated through many examples based on nonrelativistic Faddeev calculations for bound and continuum states. The modern nucleon-nucleon potential AV18 together with the threenucleon force UrbanaIX is used. The single nucleon current is augmented by explicit π-and ρ-like two-body currents which fulfill the current continuity equation together with the corresponding parts of the AV18 potential. We also employ the Siegert theorem, which induces many-body contributions to the current operator. The interplay of these different dynamical ingredients in the various electromagnetic processes is studied and the theory is compared to the experimental data.Overall we find fair to good agreement but also cases of strong disagreement between theory and experiment, which calls for improved dynamics. In several cases we refer the reader to the work of other groups and compare their results with ours. In addition we list a number of predictions for observables in different processes which would challenge this dynamical scenario even more stringently and systematically.

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“…It is important to remark that, in the forward limit, they reproduce the so called "effective polarizations" of the protons (p p ) and the neutron (p n ) in 3 He, whose values are rather similar if evaluated within different nucleon nucleon potentials (see Refs. [6,7,10] for details). For the AV18 potential, used in this work, the values p n = 0.878 and p p = −0.023 are obtained.…”

Section: Menu 2013mentioning

confidence: 99%

“…Use has been made of those corresponding to the analysis presented in Ref. [10] in terms of AV18 [11] wave functions [12]. In order to numerically evaluate Eqs.…”

Section: Menu 2013mentioning

confidence: 99%

Coherent deeply virtual Compton scattering off³He and neutron generalized parton distributions

Rinaldi

Scopetta

2014

EPJ Web of Conferences

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Abstract. It has been recently proposed to study coherent deeply virtual Compton scattering (DVCS) off 3 He nuclei to access neutron generalized parton distributions (GPDs). In particular, it has been shown that, in Impulse Approximation (IA) and at low momentum transfer, the sum of the quark helicity conserving GPDs of 3 He, H and E, is dominated by the neutron contribution. This peculiar result makes the 3 He target very promising to access the neutron information. We present here the IA calculation of the spin dependent GPDH of 3 He. Also for this quantity the neutron contribution is found to be the dominant one, at low momentum transfer. The known forward limit of the IA calculation ofH , yielding the polarized parton distributions of 3 He, is correctly recovered. The extraction of the neutron information could be anyway non trivial, so that a procedure, able to take into account the nuclear effects encoded in the IA analysis, is proposed. These calculations, essential for the evaluation of the coherent DVCS cross section asymmetries, which depend on the GPDs H , E andH , represent a crucial step for planning possible experiments at Jefferson Lab.Generalized parton distributions (GPDs), introduced in Ref.[1], describe the hadron non perturbative structure in hard exclusive processes. The study of these quantities is very important to understand several open issues of hadrons, such as, e.g., their spin structure. GPDs are related to the total angular momentum of partons inside the hadron; their knowledge, once the helicity quark contribution were subtracted, would make possible to access their orbital angular momentum (OAM) content.The most promising process for these studies is likely deeply virtual compton scattering (DVCS), i.e., the reaction eH −→ e H when Q 2 M 2 (Q 2 = −q · q is the momentum transfer between the leptons e and e , 2 the one between hadrons H and H with momenta P and P , and M the nucleon mass). Another relevant kinematical variable is the so called skewedness, = − + /(P + + P + ) 1 .

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Neutron electromagnetic form factors and inclusive scattering of polarized electrons by polarized 3He and 3H targets

Cited by 72 publications

References 28 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

Electron and photon scattering on three-nucleon bound states

Coherent deeply virtual Compton scattering off³He and neutron generalized parton distributions

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Neutron electromagnetic form factors and inclusive scattering of polarized electrons by polarized 3He and 3H targets

Cited by 72 publications

References 28 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

Electron and photon scattering on three-nucleon bound states

Coherent deeply virtual Compton scattering off3He and neutron generalized parton distributions

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Product

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Coherent deeply virtual Compton scattering off³He and neutron generalized parton distributions