Polarization measurements in neutral pion photoproduction
2002; American Institute of Physics; Volume: 66; Issue: 3 Linguagem: Inglês
10.1103/physrevc.66.034614
ISSN1538-4497
AutoresK. Wijesooriya, Andrei Afanasev, M. Amarian, K. Aniol, Saïda Ben Becher, K. Benslama, L. Bimbot, P. Bosted, E. J. Brash, J. R. Calarco, Z. Chai, C. C. Chang, Tung‐Zong Chang, J.-P. Chen, Seonho Choi, E. Chudakov, S. Churchwell, D. Crovelli, Sonja Dieterich, S. Dumalski, D. Dutta, M. Epstein, K. Fissum, B. Fox, S. Frullani, H. Gao, J. Gao, F. Garibaldi, O. Gayou, R. Gilman, A. Glamazdin, C. Glashausser, J. Gómez, V. Gorbenko, O. Hansen, R. J. Holt, Jordan Hovdebo, G. M. Huber, C. W. de Jager, X. Jiang, Catherine Jones, M. Jones, James J. Kelly, E. Kinney, Edgar E. Kooijman, G. Kumbartzki, C. C. Kuo, J. J. LeRose, M. Liang, R. Lindgren, N. Liyanage, S. Malov, D. J. Margaziotis, P. Markowitz, K. McCormick, D. Meekins, Z.-E. Meziani, R. Michaels, Jason W. Mitchell, L. Morand, C. F. Perdrisat, R. Pomatsalyuk, V. Punjabi, R. D. Ransome, R. Roché, M. Rvachev, A. Saha, A. Sarty, Eva C. Schulte, Daniel T. Simon, S. Strauch, R. Suleiman, L. Todor, P. E. Ulmer, G. M. Urciuoli, B. Wojtsekhowski, F. Xiong, W. Xu,
Tópico(s)High-Energy Particle Collisions Research
ResumoWe present measurements of the recoil proton polarization for the 1H(→γ,→p)π0 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.Received 9 May 2002DOI:https://doi.org/10.1103/PhysRevC.66.034614©2002 American Physical Society
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