Polarization observables?,P y ,T 1 in the reaction $$\vec \gamma d \to \vec pn$$ at photon energies between 200 and 600 MeV and dibaryon resonances

Abstract

The polarization observables Σ,Py,T1,Py⊥,Py∥ are derived in proton polarization measurements of the\(\vec \gamma d \to \vec pn\) reaction, using a linearly polarized photon beam of energies between 300 and 600 MeV for c.m.s. proton emission angles of 90° and 120°. A multipole analysis is performed in the framework of the gauge-invariant pole model considering theγN→πN amplitudes and the deuteron structure without dibaryon resonances and with different sets of isovector and isoscalar dibaryon resonances. It is shown that the inclusion of dibaryon resonances substantially improves agreement with experimental data.