Forward π+ electroproduction in the first resonance region at four-momentum transfers q2 = −0.15 and −0.3 GeV2/c2

Breuker, H.; Burkert, Volker; Ehses, E.; Hillen, W.; Kolanoski, H.; Leenen, M.; Nietzel, Ch.; Opara, U.; Rosenberg, M.; Samel, A.; Sauerwein, R. R.

doi:10.1016/0550-3213(78)90069-x

Cited by 23 publications

(6 citation statements)

References 9 publications

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“…6. Pion azimuthal angular dependence of the virtual photoproduction cross sections are compared with the data [28] at k 2 = −0.15 (GeV /c) 2 , W=1160, 1200 MeV and θ π = 15 0 , 25 0 , 35 0 . The legends are the same as in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…In this section we compare theoretical calculations on the nucleon performed with the electroproduction operator with a large body of existing data [25][26][27][28][29], most of which were obtained in the 1970s at Bonn and Saclay. Since our aim is to use the operator in nuclei, we only select some representative figures to show the overall quality of the operator.…”

Section: Comparison With Datamentioning

confidence: 99%

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Quasifree pion electroproduction from nuclei in theΔregion

1997

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We present calculations of the reaction A(e, e ′ πN )B in the distorted wave impulse approximation. The reaction allows for the study of the production process in the nuclear medium without being obscured by the details of nuclear transition densities. First, a pion electroproduction operator suitable for nuclear calculations is obtained by extending the Blomqvist-Laget photoproduction operator to the virtual photon case. The operator is gauge invariant, unitary, reference frame independent, and describes the existing data reasonably well. Then it is applied in nuclei to predict nuclear cross sections under a variety of kinematic arrangements. Issues such as the effects of gauge-fixing, the interference of the ∆ resonance with the background, sensitivities to the quadrupole component of the ∆ excitation and to the electromagnetic form factors, the role of final-state interactions, are studied in detail. Methods on how to experimentally separate the various pieces in the coincidence cross section are suggested. Finally, the model is compared to a recent SLAC experiment.

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Section: Discussionmentioning

confidence: 99%

Section: Comparison With Datamentioning

confidence: 99%

Quasifree pion electroproduction from nuclei in theΔregion

1997

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“…The energy of the initial electron is denoted by E e . The differential cross section dσ v /dΩ for the virtual photon sub-process is commonly further de- 32813 [125,141,148,[150][151][152][153][154][155][156][157][158][159] 1874 [160][161][162] σT + σL 318 [114,117,121,135,136,[142][143][144] 144 [151,156] - composed as…”

Section: Data and Fitsmentioning

confidence: 99%

Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model

Mai,

Döring,

Granados

et al. 2021

Preprint

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Pion and eta electroproduction data are jointly analyzed for the first time, up to a center-of-mass energy of 1.6 GeV. The framework is a dynamical coupled-channel model, based on the recent Jülich-Bonn-Washington analysis of pion electroproduction data for the same energy range. Comparisons are made to a number of single-channel eta electroproduction fits. By comparing multipoles of comparable fit quality, we find some of these amplitudes are well determined over the near-threshold region, while others will require fits over an extended energy range.

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“…dσ/dΩ 32813 [178,194,200,[202][203][204][205][206][207][208][209][210][211] σ T + σ L 144 [203,208] • σ T 2 [201] σ LT 106 [203,208] ♦ σ LT 192 [156] σ T T 91 [203,208] K D1 --…”

Section: Databaseunclassified

Jülich-Bonn-Washington Model for Pion Electroproduction Multipoles

Mai,

Döring,

Granados

et al. 2021

Preprint

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Pion electroproduction off the proton is analyzed in a new framework based on a general parametrization of transition amplitudes, including constraints from gauge invariance and threshold behavior. Data with energies 1.13 GeV < W < 1.6 GeV and Q 2 below 6 GeV 2 are included. The model is an extension of the latest Jülich-Bonn solution incorporating constraints from pion-induced and photoproduction data. Performing large scale fits (∼ 10 5 data) we find a set of solutions with χ 2 dof = 1.69 − 1.81 which allows us to assess the systematic uncertainty of the approach.

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Forward π+ electroproduction in the first resonance region at four-momentum transfers q2 = −0.15 and −0.3 GeV2/c2

Cited by 23 publications

References 9 publications

Quasifree pion electroproduction from nuclei in theΔregion

Quasifree pion electroproduction from nuclei in theΔregion

Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model

Jülich-Bonn-Washington Model for Pion Electroproduction Multipoles

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