Polarization measurements in high-energy deuteron photodisintegration.
Phys Rev Lett
; 86(14): 2975-9, 2001 Apr 02.
Article
em En
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| ID: mdl-11290086
ABSTRACT
We present measurements of the recoil proton polarization for the d(gamma-->,p-->)n reaction at straight theta(c.m.) = 90 degrees 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 p(y) 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(gamma,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.
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MEDLINE
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En
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Phys Rev Lett
Ano de publicação:
2001
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Article