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Polarization Measurements in High-Energy Deuteron Photodisintegration

Wijesooriya, K.; Fissum, Kevin LU ; Xu, W. and , (2001) In Physical Review Letters 86(14). p.2975-2979
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.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
86
issue
14
pages
2975 - 2979
publisher
American Physical Society
external identifiers
  • scopus:0035794614
ISSN
1079-7114
DOI
10.1103/PhysRevLett.86.2975
language
English
LU publication?
yes
id
db6cfa34-65ac-4b5e-84bc-638355755b7b
date added to LUP
2019-06-24 11:50:22
date last changed
2019-08-18 05:00:48
@article{db6cfa34-65ac-4b5e-84bc-638355755b7b,
  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.},
  author       = {Wijesooriya, K. and Fissum, Kevin and Xu, W. and , },
  issn         = {1079-7114},
  language     = {eng},
  number       = {14},
  pages        = {2975--2979},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Polarization Measurements in High-Energy Deuteron Photodisintegration},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.86.2975},
  volume       = {86},
  year         = {2001},
}