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 Z, P,., T~, p,5, p+!J are derived in proton polarization measurements of the d--* fin 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 the 7N~rN 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.

Electromagnetic structure of the deuteron

“…The induced polarization p y has been measured at a number of laboraties, with significant amounts of lower energy data from Stanford [167], Tokyo [169,[205][206][207], and Kharkov. There were several experiments at Kharkov, including initial measurements [215][216][217], high-energy measurements [218][219][220], simultaneous measurements of , T 1 and p y [172,[224][225][226], and lower energy measurements [244,245]. The Kharkov data do not have a desirable level of consistency.…”

“…The T data are from Tokyo (square) [223] and Bonn (circles) [233]. The p y data are from Stanford (triangles) [167], Tokyo (squares) [207], Yerevan (star) [247] and Kharkov (diamonds) [217,226]. See table 11 for related references.…”

“…Data sets from Stanford[167], Tokyo[207] and JLab[6], are in the top panel. Data sets from Kharkov (squares)[217], (stars)[220] and (diamonds)[226] are in the lower panel. See table11for related references.…”