Relativistic Hamiltonian dynamics and few-nucleon systems

Baroncini, F. A.; Pace, E.; Salmè, G.

doi:10.1007/s00601-008-0228-4

Cited by 3 publications

(6 citation statements)

References 13 publications

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“…Calculations with only S + S ′ waves are shown in [3]. Some expected features, like the presence of large relativistic effects on the tails for Q ≥ 7 (1/ f m), are well confirmed, as well as the necessity of two-body dynamical corrections to the current operator (cf the positions of the minima).…”

Section: Trinucleon Em Observablesmentioning

confidence: 76%

“…The charge and magnetic ff of 3 are presented. Calculations with only S + S ′ waves are shown in [3].…”

Section: Trinucleon Em Observablesmentioning

confidence: 99%

“…In the actual calculation we have used the bound states obtained through a variational technique [6] by taking into account twonucleon forces, like AV 18 [10], and three-body ones, like U IX [11]. Moreover, 3 He and 3 H are distinct, since the Coulomb forces are included. The bound states contain S, S ′ , P and D waves, and the Wigner-Melosh rotations suitable for expressing the LF spins in terms of the standard ones.…”

Section: Trinucleon Em Observablesmentioning

confidence: 99%

“…It should be pointed out that relativistic calculations have a twofold interest, both from a general point of view and from a phenomenological one, given the forthcoming experiments at TJLAB, in the region of few (GeV /c) 2 (see, e.g., Ref. [4] for the 3 He and 3 H ff).…”

Section: Introductionmentioning

confidence: 99%

“…a fundamental symmetry. In particular, in the study of the electromagnetic (em) form factors (ff) of few-nucleon systems some advancements were made within the so-called Light-front (LF) RHD (one out the three ones proposed by Dirac), both calculating the Deuteron em observables [2] and obtaining a first description of the Trinucleon ff [3] (retaining only S and S ′ waves). It should be pointed out that relativistic calculations have a twofold interest, both from a general point of view and from a phenomenological one, given the forthcoming experiments at TJLAB, in the region of few (GeV /c) 2 (see, e.g., Ref.…”

Section: Introductionmentioning

confidence: 99%

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Trinucleon Electromagnetic Form Factors and the Light-Front Hamiltonian Dynamics

Baroncini

Kievsky

Pace

et al. 2008

AIP Conference Proceedings

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Abstract. This contribution briefly illustrates preliminary calculations of the electromagnetic form factors of 3 He and 3 H, obtained within the Light-front Relativistic Hamiltonian Dynamics, adopting i) a Poincaré covariant current operator, without dynamical two-body currents, and ii) realistic nuclear bound states with S, P and D waves. The kinematical region of few (GeV /c) 2 , relevant for forthcoming TJLAB experiments, has been investigated, obtaining possible signatures of relativistic effects for Q 2 > 2.5 (GeV /c) 2 .

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Section: Trinucleon Em Observablesmentioning

confidence: 76%

“…The charge and magnetic ff of 3 are presented. Calculations with only S + S ′ waves are shown in [3].…”

Section: Trinucleon Em Observablesmentioning

confidence: 99%

Section: Trinucleon Em Observablesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Trinucleon Electromagnetic Form Factors and the Light-Front Hamiltonian Dynamics

Baroncini

Kievsky

Pace

et al. 2008

AIP Conference Proceedings

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Few-nucleon physics

Leidemann¹

2009

J. Phys.: Conf. Ser.

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Abstract. Recent progress in few-nucleon physics achieved by Italian research groups is described. Results for relativistic effects in elastic three-nucleon form factors (Rome group), hadronic and electromagnetic observables in three-and four-nucleon systems with special emphasis on three-nucleon force effects (Pisa and Trento groups), and spectra of nuclei with more than 4 nucleons (Padua group) are presented. IntroductionThe field of few-nucleon physics constitutes an essential part of nuclear physics. It consists of ab initio calculations of hadronic and electromagnetic observables with a given well-defined Hamiltonian of an A-nucleon system, where exact solutions of the quantum mechanical A-body system are requested for bound and/or scattering states. In particular one can consider boundstate spectra and observables from hadronic reactions like scattering lengths, phase shifts, total and differential cross sections. A polarization of beam, target, and/or final particles leads to many other hadronic polarization observables. In addition reactions with electroweak probes (photons, electrons, neutrinos) without and with polarization degrees of freedom give further information on the nuclear dynamics and electroweak structure of few-nucleon systems. For the latter one has to consider a further important aspect, namely the consistency of the electroweak currents with the nuclear Hamiltonian.Few-nucleon physics has many objectives: development of nuclear force models (nucleonnucleon (NN) and three-nucleon (3N) forces) and check whether even higher many-body forces are necessary, test of nuclear force models via two-and three-nucleon hadronic observables with possible feedback on force model, further test of nuclear dynamics in electromagnetic reactions with two-and three-nucleon systems; the study of the electroweak structure of few-nucleon systems; the investigation of the importance of relativistic effects; the extension of nuclear force models beyond pion threshold; the determination of neutron electroweak properties in twoand three-nucleon electroweak observables; the determination of observables with astrophysical relevance.Here follows a very brief summary on the state of the art for some selected aspects of fewnucleon physics. NN potential models have a long history (see e.g. [1] [5,6,7]. The potentials [2,3,4,5] all lead to a perfect or almost perfect description of various thousands of NN scattering data for energies up to pion threshold, while the chiral potential [6,7] is constructed more in the original spirit of effective field theory where open parameters are fitted to low-energy data only. The history of 3N forces started with

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Light-front spin-dependent spectral function and nucleon momentum distributions for a three-body system

et al. 2017

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Poincaré covariant definitions for the spin-dependent spectral function and for the momentum distributions within the light-front Hamiltonian dynamics are proposed for a three-fermion bound system, starting from the light-front wave function of the system. The adopted approach is based on the Bakamjian-Thomas construction of the Poincaré generators, that allows one to easily import the familiar and wide knowledge on the nuclear interaction into a light-front framework. The proposed formalism can find useful applications in refined nuclear calculations, like the ones needed for evaluating the EMC effect or the semi-inclusive deep inelastic cross sections with polarized nuclear targets, since remarkably the light-front unpolarized momentum distribution by definition fulfills both normalization and momentum sum rules. It is also shown a straightforward generalization of the definition of the light-front spectral function to an A-nucleon system.

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Relativistic Hamiltonian dynamics and few-nucleon systems

Abstract: Abstract. We present a preliminary calculation of the electromagnetic form factors of 3 He and 3 H, performed within the Light-Front Hamiltonian Dynamics. Relativistic effects show their relevance even at the static limit, increasing at higher values of momentum transfer, as expected.

Cited by 3 publications

References 13 publications

Trinucleon Electromagnetic Form Factors and the Light-Front Hamiltonian Dynamics

Trinucleon Electromagnetic Form Factors and the Light-Front Hamiltonian Dynamics

Few-nucleon physics

Light-front spin-dependent spectral function and nucleon momentum distributions for a three-body system

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