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Polarization measurements in high-energy deuteron photodisintegration
University of Illinois, Urbana-Champaign, USA.
North Carolina Central University, Durham, USA.
INFN, Sezione Sanitá and Istituto Superiore di Sanitá, Laboratorio di Fisica, Rome, Italy.
California State University, Los Angeles, USA.
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2001 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 86, no 14, 2975-2979 p.Article in journal (Refereed) Published
Abstract [en]

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)ncross sections is not a result of perturbative QCD. These data should provide important tests of new nonperturbative calculations in the intermediate energy regime.

Place, publisher, year, edition, pages
American Physical Society , 2001. Vol. 86, no 14, 2975-2979 p.
National Category
Accelerator Physics and Instrumentation
URN: urn:nbn:se:liu:diva-94197DOI: 10.1103/PhysRevLett.86.2975OAI: diva2:630188
Available from: 2013-06-18 Created: 2013-06-18 Last updated: 2013-09-12Bibliographically approved

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