Polarization Measurements in High-Energy Deuteron Photodisintegration
Wijesooriya, K. ; Fissum, Kevin LU
and Xu, W.
(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.
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/db6cfa34-65ac-4b5e-84bc-638355755b7b
- author
- Wijesooriya, K.
; Fissum, Kevin
LU
and Xu, W.
- author collaboration
- organization
- publishing date
- 2001
- 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
- project
- Nucleon Knockout with Electromagnetic Beams
- Investigations of and with Polarized Electromagnetic Beams
- language
- English
- LU publication?
- yes
- id
- db6cfa34-65ac-4b5e-84bc-638355755b7b
- date added to LUP
- 2019-06-24 11:50:22
- date last changed
- 2022-01-31 22:23:54
@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.}},
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}},
doi = {{10.1103/PhysRevLett.86.2975}},
volume = {{86}},
year = {{2001}},
}