Abstract
A coupled-channel approach incorporating quasi-bound quark-model states has been used to calculate pion-nucleon scattering amplitudes in the P11 and S11 partial waves and the corresponding pion electro-production amplitudes. The method allows for the extraction of the resonant part of the amplitudes even in the presence of different decay channels and a strong mixing of neighbouring resonances. We demonstrate the important role of the pion cloud at large distances, as opposed to the short-distance behaviour governed by the quark core.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
