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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Transition form factors: gamma{*} plus p -> Delta(1232), Delta(1600)

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Author(s):
Lu, Y. [1] ; Chen, C. [2, 3] ; Cui, Z-F [1] ; Roberts, C. D. [4] ; Schmidt, S. M. [5, 6] ; Segovia, J. [7] ; Zong, H-S [1, 8]
Total Authors: 7
Affiliation:
[1] Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu - Peoples R China
[2] Univ Estadual Paulista, Inst Fis Teor, Rua Dr Bento Teobaldo Ferraz 271, Sao Paulo, SP - Brazil
[3] Justus Liebig Univ Giessen, Inst Theoret Phys, D-35392 Giessen - Germany
[4] Argonne Natl Lab, Phys Div, Lemont, IL 60439 - USA
[5] Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich - Germany
[6] JARA, D-52425 Julich - Germany
[7] Univ Pablo Olavide, Dept Sistemas Fis Quim & Nat, E-41013 Seville - Spain
[8] Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu - Peoples R China
Total Affiliations: 8
Document type: Journal article
Source: Physical Review D; v. 100, n. 3 AUG 5 2019.
Web of Science Citations: 1
Abstract

Electroproduction form factors describing the gamma{*} p -> Delta(+)(1232), Delta(+)(1600) transitions are computed using a fully dynamical diquark-quark approximation to the Poincare-covariant three-body bound-state problem in relativistic quantum field theory. In this approach, the Delta(1600) is an analogue of the Roper resonance in the nucleon sector, appearing as the simplest radial excitation of the Delta(1232). Precise measurements of the gamma{*} p -> Delta(+)(1232) transition already exist on 0 <= Q(2) less than or similar to 8 GeV2, and the calculated results compare favorably with the data outside the meson-cloud domain. The predictions for the gamma{*} p -> Delta(+)(1600) magnetic dipole and electric quadrupole transition form factors are consistent with the empirical values at the real photon point, and extend to Q(2) approximate to 6m(p)(2), enabling a meaningful direct comparison with experiment once analysis of existing data is completed. In both cases, the electric quadrupole form factor is particularly sensitive to deformation of the Delta-baryons. Interestingly, while the gamma{*} p -> Delta(+)(1232) transition form factors are larger in magnitude than those for gamma{*} p -> Delta(+)(1600) in some neighborhood of the real photon point, this ordering is reversed on Q(2) greater than or similar to 2m(p)(2), suggesting that the gamma{*} p -> Delta(+)(1600) transition is more localized in configuration space. (AU)

FAPESP's process: 15/21550-4 - Continuum strong QCD: baryon masses and partonic structure
Grantee:Chen Chen
Support type: Scholarships in Brazil - Post-Doctorate