Wijesooriya, K. and Gao, J. and Jones, C. (2002) Polarization measurements in neutral pion photoproduction. Physical Review C, 66 (3). Art. No. 034614. ISSN 0556-2813. doi:10.1103/PhysRevC.66.034614. https://resolver.caltech.edu/CaltechAUTHORS:20131120-103322219
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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.
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| 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. | ||||||||||||||||||||||||
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| Subject Keywords: | DIFFERENTIAL CROSS-SECTION; C ANALYZING POWER; DEUTERON PHOTODISINTEGRATION; ELASTIC-SCATTERING; MESON PHOTOPRODUCTION; PARTON DISTRIBUTIONS; POLARIMETER POMME; MOMENTUM; SPIN; ELECTROPRODUCTION | ||||||||||||||||||||||||
| Issue or Number: | 3 | ||||||||||||||||||||||||
| Classification Code: | PACS: 13.60.Le, 24.70.1s, 24.85.1p, 25.20.Lj | ||||||||||||||||||||||||
| DOI: | 10.1103/PhysRevC.66.034614 | ||||||||||||||||||||||||
| Record Number: | CaltechAUTHORS:20131120-103322219 | ||||||||||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20131120-103322219 | ||||||||||||||||||||||||
| Official Citation: | Polarization measurements in neutral pion photoproduction K. Wijesooriya et al. Published 26 September 2002 (14 pages) 034614 | ||||||||||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||
| ID Code: | 42592 | ||||||||||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||||||||||
| Deposited By: | Kristofer Jolley | ||||||||||||||||||||||||
| Deposited On: | 20 Nov 2013 22:20 | ||||||||||||||||||||||||
| Last Modified: | 10 Nov 2021 16:25 |
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