Publication Title

Physical Review Letters

Publication Date

4-2-2001

Document Type

Article

DOI

10.1103/PhysRevLett.86.2975

Keywords

c analyzing power, cross-section, 2-body photodisintegration, asymptotic amplitudes, dibaryon resonances, elastic-scattering, polarimeter pomme, photon energies, gev region, momentum

Disciplines

Physics

Abstract

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.

Comments

Copyright 2001 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.86.2975.


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