- Author
- Tom Vrancx (UGent) and Jan Ryckebusch (UGent)
- Organization
- Abstract
- Background: Above the nucleon resonance region, the N(e,e'π±)N' data cannot be explained by conventional hadronic models. For example, the observed magnitude of the transverse cross section is significantly underestimated in a framework with Reggeized background amplitudes. Purpose: Develop a phenomenological framework for the N(e,e'π±)N' reaction at high invariant mass W and deep photon virtuality Q^2. Method: Building on the work of Kaskulov and Mosel [Phys. Rev. C 81, 045202 (2010)], a gauged pion-exchange current is introduced with a running cutoff energy for the proton electromagnetic transition form factor. A new transition form factor is proposed. It respects the correct on-shell limit, has a simple physical interpretation, and reduces the number of free parameters by one. Results: A study of the W dependence of the N(e,e'π±)N' lends support for the newly proposed transition form factor. In addition, an improved description of the separated and unseparated cross sections at −t ≲ 0.5 GeV^2 is obtained. The predictions overshoot the measured unseparated cross sections for −t > 0.5 GeV^2. Introducing a strong hadronic form factor in the Reggeized background amplitudes brings the calculations considerably closer to the high −t data. Conclusions: Hadronic models corrected for resonance-parton duality describe the separated pion electroproduction cross sections above the resonance region reasonably well at low −t. In order to validate the applicability of these models at high −t, separated cross sections are needed. These are expected to provide a more profound insight into the relevant reaction mechanisms.
- Keywords
- proton electromagnetic transition form factor, Regge trajectories, pion electromagnetic form factor, charged-pion electroproduction, NN COUPLING-CONSTANT, NUCLEON SCATTERING, PARTIAL-WAVE, MESONS
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Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-4302400
- MLA
- Vrancx, Tom, and Jan Ryckebusch. “Charged-Pion Electroproduction above the Resonance Region.” PHYSICAL REVIEW C, vol. 89, no. 2, 2014, doi:10.1103/PhysRevC.89.025203.
- APA
- Vrancx, T., & Ryckebusch, J. (2014). Charged-pion electroproduction above the resonance region. PHYSICAL REVIEW C, 89(2). https://doi.org/10.1103/PhysRevC.89.025203
- Chicago author-date
- Vrancx, Tom, and Jan Ryckebusch. 2014. “Charged-Pion Electroproduction above the Resonance Region.” PHYSICAL REVIEW C 89 (2). https://doi.org/10.1103/PhysRevC.89.025203.
- Chicago author-date (all authors)
- Vrancx, Tom, and Jan Ryckebusch. 2014. “Charged-Pion Electroproduction above the Resonance Region.” PHYSICAL REVIEW C 89 (2). doi:10.1103/PhysRevC.89.025203.
- Vancouver
- 1.Vrancx T, Ryckebusch J. Charged-pion electroproduction above the resonance region. PHYSICAL REVIEW C. 2014;89(2).
- IEEE
- [1]T. Vrancx and J. Ryckebusch, “Charged-pion electroproduction above the resonance region,” PHYSICAL REVIEW C, vol. 89, no. 2, 2014.
@article{4302400, abstract = {{Background: Above the nucleon resonance region, the N(e,e'π±)N' data cannot be explained by conventional hadronic models. For example, the observed magnitude of the transverse cross section is significantly underestimated in a framework with Reggeized background amplitudes. Purpose: Develop a phenomenological framework for the N(e,e'π±)N' reaction at high invariant mass W and deep photon virtuality Q^2. Method: Building on the work of Kaskulov and Mosel [Phys. Rev. C 81, 045202 (2010)], a gauged pion-exchange current is introduced with a running cutoff energy for the proton electromagnetic transition form factor. A new transition form factor is proposed. It respects the correct on-shell limit, has a simple physical interpretation, and reduces the number of free parameters by one. Results: A study of the W dependence of the N(e,e'π±)N' lends support for the newly proposed transition form factor. In addition, an improved description of the separated and unseparated cross sections at −t ≲ 0.5 GeV^2 is obtained. The predictions overshoot the measured unseparated cross sections for −t > 0.5 GeV^2. Introducing a strong hadronic form factor in the Reggeized background amplitudes brings the calculations considerably closer to the high −t data. Conclusions: Hadronic models corrected for resonance-parton duality describe the separated pion electroproduction cross sections above the resonance region reasonably well at low −t. In order to validate the applicability of these models at high −t, separated cross sections are needed. These are expected to provide a more profound insight into the relevant reaction mechanisms.}}, articleno = {{025203}}, author = {{Vrancx, Tom and Ryckebusch, Jan}}, issn = {{0556-2813}}, journal = {{PHYSICAL REVIEW C}}, keywords = {{proton electromagnetic transition form factor,Regge trajectories,pion electromagnetic form factor,charged-pion electroproduction,NN COUPLING-CONSTANT,NUCLEON SCATTERING,PARTIAL-WAVE,MESONS}}, language = {{eng}}, number = {{2}}, pages = {{10}}, title = {{Charged-pion electroproduction above the resonance region}}, url = {{http://doi.org/10.1103/PhysRevC.89.025203}}, volume = {{89}}, year = {{2014}}, }
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