Nucleon electromagnetic form factors in a relativistic quark-pair-creation model

Cano, F.; Desplanques, B.; González, P.; Noguera, S.

doi:10.1016/s0375-9474(01)00889-2

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…On the other hand, it is surprising that quark form factors (which may account for the above coupling of the ω and ρ mesons) are discarded while they are needed in the construction of the quark-quark interaction used to describe the nucleon [6]. An attempt to incorporate the above physics at the quark level was recently made [7]. * Electronic address: desplanq@lpsc.in2p3.fr † Electronic address: Lukas.Theussl@uv.es…”

Section: Introductionmentioning

confidence: 99%

Form factors in the “point form” of relativistic quantum mechanics: Single- and two-particle currents

Desplanques¹,

Theußl²

2004

Eur. Phys. J. A

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Electromagnetic and Lorentz-scalar form factors are calculated for a bound system of two spinless particles exchanging a zero-mass scalar particle. Different approaches are considered including solutions of a Bethe-Salpeter equation, a "point form" approach to relativistic quantum mechanics and a non-relativistic one. The comparison of the Bethe-Salpeter results, which play the role of an "experiment" here, with the ones obtained in "point form" in single-particle approximation, evidences sizable discrepancies, pointing to large contributions from two-body currents in the latter approach. These ones are constructed using two constraints: ensuring current conservation and reproducing the Born amplitude. The two-body currents so obtained are qualitatively very different from standard ones. Quantitatively, they turn out not to be sufficient to remedy all the shortcomings of the "point form" form factors evidenced in impulse approximation.

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Section: Introductionmentioning

confidence: 99%

Form factors in the “point form” of relativistic quantum mechanics: Single- and two-particle currents

Desplanques¹,

Theußl²

2004

Eur. Phys. J. A

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“…We will consider the model of 3 P 0 scalar qq fluctuation [1,2,3,4]. It * E-mail: obukh@nucl-th.sinp.msu.ru Unauthenticated Download Date | 5/11/18 2:10 AM gives a reasonable description of nucleon electromagnetic form factors [5]. It also provides a unified basis to produce meson clouds in different channels of real decay B → N + m [6] and of virtual decay N → B + m [7] with various mesons m and baryons B, by projecting the q 3 qq wave function of "dressed" nucleon to the above B + m channels using here the harmonic oscillator quark wave functions for both baryon and meson.…”

Section: Introductionmentioning

confidence: 99%

The exclusive reaction of pion quasi-elastic knockout from nucleon p(e, e′ π)B to various states of the final baryon-spectator B and the quark models for the pion cloud of nucleon

et al. 2004

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Abstract:The pion momentum distributions (MDs) in four channels of virtual decay p → B + π, B = N, ∆, N 1/2 − (1535), N 1/2 + (1440) are calculated in two models, the microscopic model of 3 P 0 scalar qq fluctuation with the pion as a composite qq-system and the chiral semi-microscopic model of πq interaction with the pion as a structureless Goldstone boson. The results of the above models are similar for the baryon states B = N, ∆, N 1/2 − (1535) but are rather different for the Roper resonance N 1/2 + (1440) which corresponds to excitation of two oscillator quanta in the nucleon. The experimental investigation of pion MDs by means of the reaction of quasi-elastic knockout of pion by an electron of a few GeV energy p(e, e π)B may be very suitable for Jefferson Laboratory, Virginia (JLab).

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Nucleon electromagnetic form factors in a relativistic quark-pair-creation model

Cited by 2 publications

References 17 publications

Form factors in the “point form” of relativistic quantum mechanics: Single- and two-particle currents

Form factors in the “point form” of relativistic quantum mechanics: Single- and two-particle currents

The exclusive reaction of pion quasi-elastic knockout from nucleon p(e, e′ π)B to various states of the final baryon-spectator B and the quark models for the pion cloud of nucleon

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