Polarization Measurements in High-Energy Deuteron Photodisintegration

Phys. Rev. Lett. 86, 2975 – Published 2 April 2001
K. Wijesooriya et al. (Jefferson Lab Hall A Collaboration)

Abstract

We present measurements of the recoil proton polarization for the d(γ,p)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.

DOI: http://dx.doi.org/10.1103/PhysRevLett.86.2975

  • Received 15 September 2000
  • Revised 19 December 2000
  • Published in the issue dated 2 April 2001

© 2001 The American Physical Society

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