Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5495190 | Physics Letters B | 2017 | 5 Pages |
Abstract
We investigate photoproduction of charged Ï off the nucleon using Ï(770)+Ï(140) Regge pole exchanges by considering the Ï-meson electromagnetic multipole moments. The significance of the Ward identity at the γÏÏ vertex is emphasized for current conservation in the process. Given Ï exchange with the well-known coupling constants for γÏÏ and ÏNN, we analyze the role of the Ï exchange in the γpâÏ+n and γnâÏâp processes without model-dependences except for the magnetic moment μϱ=±2.01 and electric quadrupole moment Qϱ=±0.027fm2 taken from theoretical estimates. The nondiffractive feature of both cross sections is reproduced with a rapid decrease beyond the resonance region by the dominance of Ï exchange over the Ï. Cross sections for differential and density matrix elements are presented to compare with existing data. The parity and photon polarization asymmetries are predicted to demonstrate the apparent roles of the Ï-meson electromagnetic multipole moments.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Byung-Geel Yu, Kook-Jin Kong,