Polarization Measurements in High-Energy Deuteron Photodisintegration
2001; American Physical Society; Volume: 86; Issue: 14 Linguagem: Inglês
10.1103/physrevlett.86.2975
ISSN1092-0145
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)Nuclear physics research studies
ResumoWe present measurements of the recoil proton polarization for the d(γ→,p→)n reaction at θc.m.=90° for photon energies up to 2.4 GeV. These are the first data in this reaction for polarization transfer with circularly polarized photons. The induced polarization py vanishes above 1 GeV, contrary to meson-baryon model expectations, in which resonances lead to large polarizations. However, the polarization transfer Cx does not vanish above 1 GeV, inconsistent with hadron helicity conservation. Thus, we show that the scaling behavior observed in the d(γ,p)n cross sections is not a result of perturbative QCD. These data should provide important tests of new nonperturbative calculations in the intermediate energy regime.Received 15 September 2000DOI:https://doi.org/10.1103/PhysRevLett.86.2975©2001 American Physical Society
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