Resonance (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Δ</mml:mi><mml:mi>Δ</mml:mi></mml:math>) degrees of freedom in the deuteron and their influence on the electromagnetic form factors

Gari, M.; Hyuga, Hiroyuki; Sommer, B.

doi:10.1103/physrevc.14.2196

Cited by 29 publications

(6 citation statements)

References 16 publications

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“…[10] and references therein). The efforts, aiming to solve this difficulty, go in two main directions, namely calculating the corrections of the meson exchange currents [11][12][13] and taking into account the relativistic effects [1,2,14,15,3,16,18]. In the conventional approach the mesonic degrees of freedom and relativistic effects are treated as corrections to the nonrelativistic potential theory.…”

Section: Introductionmentioning

confidence: 99%

Bethe-Salpeter amplitudes and static properties of the deuteron

et al. 1996

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Extended calculations of the deuteron's static properties, based on the numerical solution of the Bethe-Salpeter equation, are presented. A formalism is developed, which provides a comparative analysis of the covariant amplitudes in various representations and nonrelativistic wave functions. The magnetic and quadrupole moments of the deuteron are calculated in the Bethe-Salpeter formalism and the role of relativistic corrections is discussed. ͓S0556-2813͑96͒02309-6͔

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Section: Introductionmentioning

confidence: 99%

Bethe-Salpeter amplitudes and static properties of the deuteron

et al. 1996

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“…The six-quark bag contribution to ga does not exceed 0.004 n.m. and is of the same order of magnitude as the contributions of the other nonclassical effects (the MEC [16], relativistic corrections [17] and the contribution due to anti-symmetrization of 7Jh in Eq. (4) [18])*.…”

Section: Six-quark Bag Corrections To the Deuteron Multipole Momentsmentioning

confidence: 83%

The quark compound bag model: Defining the admixture of six-quark bag in the deuteron

Kalashnikova

Narodetskii

Veselov

1986

Z. Physik A - Atomic Nuclei

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The probability of the six-quark bag part of the deuteron is defined within recently formulated quark compound bag (QCB) model. An upper limit of about 1% for the admixture of the confined bag in the deuteron is found for the QCB potential supplied by the long range Paris interaction. The six-quark bag corrections to the static multipole moments of the deuteron are estimated to be < 1% for #d and <6 % for Qd.

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“…Coupled channel t-matrices providing a nonperturbative description of all possible transitions between NN, ∆N and ∆∆ states have been available for more than 25 years [31][32][33] and have already been used to calculate the ∆-isobar contributions to ppbremsstrahlung observables [19,20]. Under these circumstances it may appear curious that we choose to develop a perturbative description of the N∆γ π− and ρ− exchange currents.…”

Section: Local Gauge Symmetriesmentioning

confidence: 99%

“…Strong interaction transitions between NN, ∆N and ∆∆ states can be described non-perturbatively with a coupled channel t-matrix [31][32][33] and indeed have already been used to calculate pp-bremsstrahlung observables [19,20]. Under these circumstances it may appear curious that we have chosen to present a perturbative description of such amplitudes as meson-exchange currents.…”

Section: G Some Problems With Non-perturbative Descriptionsmentioning

confidence: 99%

“…Under these circumstances it may appear curious that we have chosen to present a perturbative description of such amplitudes as meson-exchange currents. There are, however, a number of difficulties in applications of these coupled channel t-matrices, the most serious of which appears to arise from the inconsistencies that exist between the Paris [34] NN ⇀ ↽NN and the Ried parameterized version of the static-limit Bochum [31][32][33] ∆N ⇀ ↽NN interaction. In particular, the conflicting definitions of the NNπ and N∆π coupling constants and form factors makes it impossible to reliably remove the double-counted NN ⇀ ↽NN amplitudes involving intermediate N∆ states, so that a free parameter is introduced to simulate the necessary subtraction.…”

Section: G Some Problems With Non-perturbative Descriptionsmentioning

confidence: 99%

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Consistent meson-field-theoretical description ofppbremsstrahlung

Eden

Gari

1996

Phys. Rev. C

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A parameter-free and relativistic extension of the RuhrPot meson-baryon model is used to define the dominant isoscalar meson-exchange currents. We compute pp-bremsstrahlung observables below the π−production threshold using a relativistic hadronic current density that includes impulse, wave function re-orthonormalization, meson-recoil, NN creation and annihilation, ρπγ + ωπγ + ρηγ + ωηγ vector-meson decay and N∆γ(π, ρ) exchange currents. We obtain a good description of the available data. The N∆γ(π) current is shown to dominate the large two-body contributions and closed-form expressions for various non-relativistic approximations are analyzed. An experimental sensitivity to the admixture of pseudo-scalar and pseudo-vector admixture of the NNπ interaction is demonstrated. We examine the Lorentz invariance of the NN ⇀ ↽NN t-matrices and show a dominantly pseudo-vector NNπ coupling renders impulse approximation calculations without boost operators to be essentially exact. Conversely, a similar analysis of the ∆N ⇀ ↽NN transitions shows that boost operators and the two-body N ∆γ wave function re-orthonormalization meson-recoil currents are required in NN, ∆N and ∆∆ coupled channel t-matrix applications. The need for additional data is stressed.

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Resonance (ΔΔ) degrees of freedom in the deuteron and their influence on the electromagnetic form factors

Cited by 29 publications

References 16 publications

Bethe-Salpeter amplitudes and static properties of the deuteron

Bethe-Salpeter amplitudes and static properties of the deuteron

The quark compound bag model: Defining the admixture of six-quark bag in the deuteron

Consistent meson-field-theoretical description ofppbremsstrahlung

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