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Ramalho, G.; Tsushima, K.
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Science (United States)
arXiv e-print [ PDF ]2010
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Science (United States)
arXiv e-print [ PDF ]2010
AbstractAbstract
[en] A covariant spectator constituent quark model is applied to study the γN → Δ(1600) transition. Two processes are important in the transition: a photon couples to the individual quarks of the Δ(1600) core (quark core), and a photon couples to the intermediate pion-baryon states (pion cloud). While the quark core contributions are estimated assuming Δ(1600) as the first radial excitation of Δ(1232), the pion cloud contributions are estimated based on an analogy with the γN → Δ(1232) transition. To estimate the pion cloud contributions in the γN → Δ(1600) transition, we include the relevant intermediate states, π-N, π-Δ, π-N(1440) and π-Δ(1600). Dependence on the four-momentum transfer squared, Q2, is predicted for the magnetic dipole transition form factor, G*M(Q2), as well as the helicity amplitudes, A1/2(Q2) and A3/2(Q2). The results at Q2 = 0 are compared with the existing data.
Primary Subject
Source
JLAB-THY--10-1219; DOE/OR--23177-1271; AC05-06OR23177; Available from http://www1.jlab.org/Ul/Publications/documents/DeltaStar_Jlab1.pdf
Record Type
Journal Article
Journal
Physical Review. D, Particles, Fields, Gravitation and Cosmology; ISSN 1550-7998;
; v. 82(7); p. 073007

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