We present measurements of the recoil proton polarization for the d(γ⃗,p⃗)n reaction at θc.m. = 90° for photon energies up to 2.4 GeV. These are the first data in this reaction for polarization transfer with circularly polarized photons. The induced polarization py vanishes above 1 GeV, contrary to meson-baryon model expectations, in which resonances lead to large polarizations. However, the polarization transfer Cx does not vanish above 1 GeV, inconsistent with hadron helicity conservation. Thus, we show that the scaling behavior observed in the d(γ,p)n cross sections is not a result of perturbative QCD. These data should provide important tests of new nonperturbative calculations in the intermediate energy regime.
Physical Review Letters
Copyright 2001 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.86.2975.
Wijesooriya, K.; Kooijman, Edgar E; Jefferson Lab Hall A Collaboration (2001). Polarization Measurements in High-Energy Deuteron Photodisintegration. Physical Review Letters 86(14) 2975-2979. doi: 10.1103/PhysRevLett.86.2975. Retrieved from https://oaks.kent.edu/bscipubs/1