Polarization measurements in neutral pion photoproduction

K. Wijesooriya, A. Afanasev, M. Amarian, K. Aniol, S. Becher, K. Benslama, L. Bimbot, P. Bosted, E. J. Brash, J. Calarco, Z. Chai, C. C. Chang, T. Chang, J. P. Chen, S. Choi, E. Chudakov, S. Churchwell, D. Crovelli, Sonja Dieterich, S. DumalskiD. Dutta, M. Epstein, K. Fissum, B. Fox, S. Frullani, H. Gao, J. Gao, F. Garibaldi, O. Gayou, R. Gilman, A. Glamazdin, C. Glashausser, J. Gomez, V. Gorbenko, O. Hansen, R. J. Holt, J. Hovdebo, G. M. Huber, C. W. De Jager, X. Jiang, C. Jones, M. K. Jones, J. Kelly, E. Kinney, E. Kooijman, G. Kumbartzki, M. Kuss, J. LeRose, M. Liang, R. Lindgren, N. Liyanage, S. Malov, D. J. Margaziotis, P. Markowitz, K. McCormick, D. Meekins, Z. E. Meziani, R. Michaels, J. Mitchell, L. Morand, C. F. Perdrisat, R. Pomatsalyuk, V. Punjabi, R. D. Ransome, R. Roche, M. Rvachev, A. Saha, A. Sarty, E. C. Schulte, D. Simon, S. Strauch, R. Suleiman, L. Todor, P. E. Ulmer, G. M. Urciuoli, B. Wojtsekhowski, F. Xiong, W. Xu

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


We present measurements of the recoil proton polarization for the 1H(γ,p0 reaction for θπc.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.

Original languageEnglish (US)
Pages (from-to)346141-3461414
Number of pages3115274
JournalPhysical Review C - Nuclear Physics
Issue number3
StatePublished - Sep 1 2002
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics


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