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Polarization measurements in neutral pion photoproduction

Wijesooriya, K; Afanasev, A; Amarian, M; Aniol, K; Becher, S; Benslama, K; Bimbot, L; Bosted, P; Brash, EJ and Calarco, J, et al. (2002) In Physical Review C (Nuclear Physics) 66(3).
Abstract
We present measurements of the recoil proton polarization for the H-1((γ) over right arrow,(p) over right arrow)pi(0) reaction for theta(c.m.)(pi) = 60degrees-135degrees 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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publication status
published
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Physical Review C (Nuclear Physics)
volume
66
issue
3
publisher
American Physical Society
external identifiers
  • wos:000178383900035
  • scopus:4243964735
ISSN
0556-2813
DOI
10.1103/PhysRevC.66.034614
language
English
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yes
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c7b7343c-3369-4ad7-a4f2-74240df0ffbf (old id 325857)
date added to LUP
2007-11-09 15:58:02
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2017-12-10 04:39:04
@article{c7b7343c-3369-4ad7-a4f2-74240df0ffbf,
  abstract     = {We present measurements of the recoil proton polarization for the H-1((γ) over right arrow,(p) over right arrow)pi(0) reaction for theta(c.m.)(pi) = 60degrees-135degrees 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.},
  author       = {Wijesooriya, K and Afanasev, A and Amarian, M and Aniol, K and Becher, S and Benslama, K and Bimbot, L and Bosted, P and Brash, EJ and Calarco, J and Chai, Z and Chang, CC and Chang, T and Chen, JP and Choi, S and Chudakov, E and Churchwell, S and Crovelli, D and Dieterich, S and Dumalski, S and Dutta, D and Epstein, M and Fissum, Kevin and Fox, B and Frullani, S and Gao, H and Gao, J and Garibaldi, F and Gayou, O and Gilman, R and Glamazdin, A and Glashausser, C and Gomez, J and Gorbenko, V and Hansen, O and Holt, RJ and Hovdebo, J and Huber, GM and de Jager, CW and Jiang, X and Jones, C and Jones, MK and Kelly, J and Kinney, E and Kooijman, E and Kumbartzki, G and Kuss, M and LeRose, J and Liang, M and Lindgren, R and Liyanage, N and Malov, S and Margaziotis, DJ and Markowitz, P and McCormick, K and Meekins, D and Meziani, ZE and Michaels, R and Mitchell, J and Morand, L and Perdrisat, CF and Pomatsalyuk, R and Punjabi, V and Ransome, RD and Roche, R and Rvachev, M and Saha, A and Sarty, A and Schulte, EC and Simon, D and Strauch, S and Suleiman, R and Todor, L and Ulmer, PE and Urciuoli, GM and Wojtsekhowski, B and Xiong, F and Xu, W},
  issn         = {0556-2813},
  language     = {eng},
  number       = {3},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Polarization measurements in neutral pion photoproduction},
  url          = {http://dx.doi.org/10.1103/PhysRevC.66.034614},
  volume       = {66},
  year         = {2002},
}