Electroexcitation of nucleon resonances

Burkert, Volker

doi:10.1007/bf01692561

Cited by 23 publications

(29 citation statements)

References 38 publications

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“…This code computes RC to the four-fold cross section (d 4 σ/dW dQ 2 d cos θdφ h ) and to polarization beam asymmetry for processes (1). Both exact and leading log formulas obtained in the previous sections are included.…”

Section: Numerical Analysismentioning

confidence: 99%

“…New measurements with the CLAS detector at Jefferson Lab/Hall B [1] are expected to greatly improve the systematic and statistical precision and cover a wide kinematic range in four-momentum transfer Q 2 and invariant mass W , as well as the full angular range of the resonance decay into the nucleon-pion final state: e(k 1 ) + p(p) −→ e ′ (k 2 ) + π + (p h ) + n(p u ), e(k 1 ) + p(p) −→ e ′ (k 2 ) + p(p h ) + π 0 (p u ),…”

Section: Introductionmentioning

confidence: 99%

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QED radiative corrections in processes of exclusive pion electroproduction

et al. 2002

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Section: Numerical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

QED radiative corrections in processes of exclusive pion electroproduction

et al. 2002

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“…Data on pion electroproduction (see review [45]) indicate however that the corresponding helicity amplitude S 1/2 is very small, consistent with zero. The longitudinal coupling in the γNP 11 vertex has thus been neglected.…”

Section: B Results For Response Functions In Virtual Compton Scatteringmentioning

confidence: 76%

Photoproduction of electron–positron pairs on the proton in the resonance region

Korchin¹,

Scholten²

2001

Nuclear Physics A

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Production of lepton pairs in the γp → e − e + p reaction is studied at photon energies up to 1 GeV. We show that even if lepton charge is not measured there are extensive kinematical regimes where the nuclear process dominates over the Bethe-Heitler contribution. The decomposition is performed of the unpolarized cross section for the virtual Compton scattering in terms of response functions. These are expressed in terms of a polarization density matrix of the virtual photon and are shown to be sensitive to the properties of baryon resonances in the first and the second resonance regions. In the analysis a unitary K-matrix model is used, based on an effective Lagrangian including nucleon, mesons, and baryon resonances with masses up to 1.7 GeV. Results of the model are compared with data for real-photon Compton scattering and predictions are given for observables in photoproduction of lepton pairs.

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“…is independent of Q 2 and equal to −2/3; iii) all the radiative transitions among members of the [56, 0 + ] and [70, 1 − ] SU(6)-multiplets can be written in terms of only three independent parameters [2].…”

Section: Introductionmentioning

confidence: 99%

Relativistic Quark Models

Simula¹

2001

Nstar 2001

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The application of relativistic constituent quark models to the evaluation of the electromagnetic properties of the nucleon and its resonances is addressed. The role of the pair creation process in the Feynmann triangle diagram is discussed and the importance both of choosing the light-front formalism and of using a Breit frame where the plus component of the four-momentum transfer is vanishing, is stressed. The nucleon elastic form factors are calculated free of spurious effects related to the loss of rotational covariance. The effect of a finite constituent size is considered and the parameters describing the constituent form factors are fixed using only the nucleon data up to Q 2 ≃ 1 (GeV /c) 2 ; a constituent charge radius of ≃ 0.45 f m is obtained in this way. Above Q 2 ≃ 1 (GeV /c) 2 our parameter-free predictions are in good agreement with the experimental data, showing that soft physics may be dominant up to Q 2 ∼ 10 (GeV /c) 2 . Our new results for the longitudinal and transverse helicity amplitudes of the N − P 11 (1440) transition are presented.

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Electroexcitation of nucleon resonances

Cited by 23 publications

References 38 publications

QED radiative corrections in processes of exclusive pion electroproduction

QED radiative corrections in processes of exclusive pion electroproduction

Photoproduction of electron–positron pairs on the proton in the resonance region

Relativistic Quark Models

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