Published September 2002
| Published
Journal Article
Open
Polarization measurements in neutral pion photoproduction
Abstract
We present measurements of the recoil proton polarization for the ^1H(γ ,p )π^0 reaction for θ^π_(c.m.)=60°–135° and for photon energies up to 4.1 GeV. These are the first data in this reaction for polarization transfer with circularly polarized photons. Various theoretical models are compared with the results. No evidence for hadron helicity conservation is observed. Models that employ factorization are not favored. It appears from the strong angular dependence of the induced polarization at photon energies of 2.5 and 3.1 GeV that a relatively high spin resonance or background amplitude might exist in this energy region.
Additional Information
©2002 The American Physical Society. Received 9 May 2002. Published 26 September 2002. We are particularly indebted to Dick Arndt, Igor Strakovsky, and Ron Workman for many discussions concerning SAID and the polarization observables in the c.m. and lab frames. We thank G. Farrar, N. Isgur, T.-S.H. Lee, A. Radyushkin, and J. Ralston for many interesting discussions. We thank the JLab physics and accelerator divisions for their support, especially Ed Folts and the Hall A technical staff, and Charles Sinclair and the polarized source group. This work was supported by the U.S. Department of Energy, the U.S. National Science Foundation, the Natural Sciences and Engineering Research Council of Canada, the French Commissariat à l'Energie Atomique and Center National de la Recherche Scientifique, the Italian National Institute for Nuclear Physics, and the Swedish Natural Science Research Council. The Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility under DOE Contract No. DE-AC05-84ER40150. The polarimeter was funded by the U.S. National Science Foundation, Grant Nos. PHY 9213864 and PHY 9213869. The Møller polarimeter was funded by Grant No. INTAS-99- 125.Attached Files
Published - PhysRevC.66.034614.pdf
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PhysRevC.66.034614.pdf
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Additional details
- Eprint ID
- 42592
- Resolver ID
- CaltechAUTHORS:20131120-103322219
- DE-AC05-84ER40150
- Department of Energy (DOE)
- PHY-9213864
- NSF
- PHY-9213869
- NSF
- Department of Energy (DOE)
- NSF
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Commissariat à l'Energie Atomique (CEA)
- Center National de la Recherche Scientifique
- Italian National Institute for Nuclear Physics (INFN)
- Swedish Natural Science Research Council
- Created
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2013-11-20Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field