Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-06-11
Phys.Rev.C82:045206,2010
Physics
Nuclear Physics
Nuclear Theory
10 pages, 12 figures
Scientific paper
10.1103/PhysRevC.82.045206
We explain the application of a recently developed analytic continuation method to extract the electromagnetic transition form factors for the nucleon resonances ($N^*$) within a dynamical coupled-channel model of meson-baryon reactions.Illustrative results of the obtained $N^*\rightarrow \gamma N$ transition form factors, defined at the resonance pole positions on the complex energy plane, for the well isolated $P_{33}$ and $D_{13}$, and the complicated $P_{11}$ resonances are presented. A formula has been developed to give an unified representation of the effects due to the first two $P_{11}$ poles, which are near the $\pi\Delta$ threshold, but are on different Riemann sheets. We also find that a simple formula, with its parameters determined in the Laurent expansions of $\pi N \rightarrow \pi N$ and $\gamma N \rightarrow\pi N$ amplitudes, can reproduce to a very large extent the exact solutions of the considered model at energies near the real parts of the extracted resonance positions. We indicate the differences between our results and those extracted from the approaches using the Breit-Wigner parametrization of resonant amplitudes to fit the data.
Lee T. S. -H.
Sato Takeshi
Suzuki Nao
No associations
LandOfFree
Extraction of Electromagnetic Transition Form Factors for Nucleon Resonances within a Dynamical Coupled-Channels Model 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 Extraction of Electromagnetic Transition Form Factors for Nucleon Resonances within a Dynamical Coupled-Channels Model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extraction of Electromagnetic Transition Form Factors for Nucleon Resonances within a Dynamical Coupled-Channels Model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-76906