Evidence for Nonnucleonic Effects in the Threshold Electrodisintegration of the Deuteron at High Momentum Transfer

Auffret, S.; Cavedon, J.M.; Clémens, J. C.; Frois, B.; Goutte, Dominique; Huet, H.; Juster, F.P.; Leconte, Ph.; Martino, J.; Mizuno, Y.; Phan, X. H.; Platchkov, S.; Sick, I.

doi:10.1103/physrevlett.55.1362

Cited by 78 publications

(38 citation statements)

References 24 publications

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“…These ones are dominated by the exchange of the pion, due to both its low mass and the low energy domain. In related area, dealing for instance with electromagnetic properties of light nuclei, the relevance of the pion degree of freedom relies on meson exchange current contributions to the deuteron electrodisintegration near threshold [62], where it allows to achieve agreement with experiment at momentum transfers around Q 2 ∼ 0.5 (Gev/c) 2 [63]. As this contribution is not required by a pure phenomenological description of the NN interaction, it is a clear evidence for the role of the pion in the description of nuclear forces.…”

Section: Mesonic Degrees Of Freedom In Nucleimentioning

confidence: 99%

Explicitly covariant light-front dynamics and relativistic few-body systems

Carbonell¹,

Desplanques²,

et al. 1998

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The wave function of a composite system is defined in relativity on a space-time surface. In the explicitly covariant light-front dynamics, reviewed in the present article, the wave functions are defined on the plane ω·x = 0, where ω is an arbitrary four-vector with ω 2 = 0. The standard non-covariant approach is recovered as a particular case for ω = (1, 0, 0, −1). Using the light-front plane is of crucial importance, while the explicit covariance gives strong advantages emphasized through all the review.The properties of the relativistic few-body wave functions are discussed in detail and are illustrated by examples in a solvable model. The three-dimensional graph technique for the calculation of amplitudes in the covariant light-front perturbation theory is presented.The structure of the electromagnetic amplitudes is studied. We investigate the ambiguities which arise in any approximate light-front calculations, and which lead to a non-physical dependence of the electromagnetic amplitude on the orientation of the lightfront plane. The elastic and transition form factors free from these ambiguities are found for spin 0, 1/2 and 1 systems.The formalism is applied to the calculation of the relativistic wave functions of twonucleon systems (deuteron, scattering state), with particular attention to the role of their new components in the deuteron elastic and electrodisintegration form factors and to their connection with meson exchange currents. Straigthforward applications to the pion and nucleon form factors and the ρ − π transition are also made. ,0 = − 2η(F 1 − ηF 2 + G 1 /2) + η/2B 6 ,(6.63)The matrix elementsJ 11 ,J 1−1 have the same form as J 11 , J 1−1 , whereasJ 10 ,J 00 differ from J 10 , J 00 by the items containing the nonphysical form factors B 5 , B 6 , B 7 . Other nonphysical form factors B 1−4 and B 8 do not contribute to these matrix elements.The matrix elementsJ λ ′ λ do not satisfy the condition (6.61). SubstitutingJ λ ′ λ in eq.(6.61) instead of J λ ′ λ , we get: ∆ ≡ (1 + 2η)J 11 +J 1−1 − 2 2ηJ 10 −J 00 = −(B 5 + B 7 ) .(6.64)

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Section: Mesonic Degrees Of Freedom In Nucleimentioning

confidence: 99%

Explicitly covariant light-front dynamics and relativistic few-body systems

Carbonell¹,

Desplanques²,

et al. 1998

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“…In the NRIA, the contribution of MEC was discussed at the end of section 5.2. A number of experimental measurements, the most famous being the electrodisintegration of the deuteron at threshold [95], have established the existence of isovector mesonexchange currents [96]. In contrast, the nature and size of isoscalar exchange currents is still an issue of some controversy.…”

Section: Meson-exchange Currentsmentioning

confidence: 99%

Measurement of the Electric and Magnetic Elastic Structure Functions of the Deuteron at Large Momentum Transfers

Suleiman

1999

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“…In fig.2 we show our results for d(e,e')np in comparison to the Saclay experiments [2]. As e.m. MEC form factor we have taken G E (dipole fit, GE(n)=0) and the corresponding F I. and Bonn r-space (full curves) potential using G E and F 1 and for Bonn q-space (dashed curve) potential using G E.…”

Section: Thresholdmentioning

confidence: 66%

“…In this note we would like to report on a new calculation of d(e,e')np near threshold using the recent r-and q-space Bonn potentials [ i.e., higher q-region uncertainties arise from electromagnetic and hadronic form factors and unknown relativistic corrections [2].…”

Section: Thresholdmentioning

confidence: 99%