Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-08-26
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 15 figures. To appear in the proceedings of Workshop on Hadronic and Nuclear Physics 2007, Pusan National University
Scientific paper
We study electromagnetic properties of the nucleon and Roper resonance in a chiral quark-diquark model including two kinds of diquarks needed to describe the nucleon: scalar and axial-vector diquarks. The nucleon and Roper resonance are described as superpositions of two quark-diquark bound states of a quark and a scalar diquark and of a quark and an axial-vector diquark. Electromagnetic form factors of the nucleon and Roper resonance are obtained from one-loop diagrams where the quark and diquarks are coupled by a photon. We include the effects of intrinsic properties of the diquarks: the intrinsic form factors both of the diquarks and the anomalous magnetic moment of the axial-vector diquark. The electric form factors of the proton and neutron reasonably agree with the experiments due to the inclusions of the diquark sizes, while the magnetic moments become smaller than the experimental values because of the scalar dominance in the nucleon. The charge radii of the Roper resonance are almost comparable with those of the nucleon.
Hosaka Atsushi
Nagata Keitaro
No associations
LandOfFree
Structure of the Roper Resonance with Diquark Correlations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Structure of the Roper Resonance with Diquark Correlations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structure of the Roper Resonance with Diquark Correlations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-599808