2009/04/30 by Bruno Juliá-Díaz, B. Julia-Diaz, H. Kamano +7 · 3 citations
Mathematics · Physics and Astronomy · #Crystallography #Geometry #Hadron #Mathematics #Meson #Nuclear physics research studies #Partial wave analysis #Particle physics #Particle physics theoretical and experimental studies #Physics #Pi #Quantum Chromodynamics and Particle Interactions #Sensitivity (control systems) #Unitarity #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevc.80.025207
published as Phys.Rev.C80:025207,2009 · 14 pages, 11 figures. Version to appear in PRC
openalex publication_date 2009/08/24 · arxiv created 2009/08/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We have performed a dynamical coupled-channels analysis of available p(e,e^\ensuremath'\ensuremathπ)N data in the region of W\ensuremath\leqslant1.6 GeV and Q2\ensuremath\leqslant1.45 (GeV/c)2. The channels included are \ensuremathγ*N, \ensuremathπN, \ensuremathηN, and \ensuremathπ\ensuremathπN that has \ensuremathπ\ensuremathΔ, \ensuremathρN, and \ensuremathσN components. With the hadronic parameters of the model determined in our previous investigations of \ensuremathπN\ensuremath→\ensuremathπN, \ensuremathπ\ensuremathπN reactions, we have found that the available data in the considered W\ensuremath\leqslant1.6 GeV region can be fitted well by only adjusting the bare \ensuremathγ*N\ensuremath→N* helicity amplitudes for the lowest N* states in P33, P11, S11, and D13 partial waves. The sensitivity of the resulting parameters to the amount of data included in the analysis is investigated. The importance of coupled-channels effect on the p(e,e^\ensuremath'\ensuremathπ)N cross sections is demonstrated. The meson cloud effect, as required by the unitarity conditions, on the \ensuremathγ*N\ensuremath→N* form factors are also examined. Necessary future developments, both experimentally and theoretically, are discussed.