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The graal experiment: Beam polarization asymmetries in pseudoscalar meson photoproduction |
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| Authors: | Rachele Di Salvo J. Ajaka M. Anghinolfi O. Bartalini V. Bellini G. Berrier J. P. Bocquet M. Breuer P. Calvat M. Capogni L. Casano M. Castoldi L. Ciciani P. Corvisiero A. D'Angelo J. P. Didelez Ch. Djalali M. A. Duval R. Frascaria C. Gaulard G. Gervino F. Ghio P. Girard B. Girolami M. Guidal E. Guinault E. Hourany V. Kuznetsov A. Lapik P. Levi Sandri A. Lleres D. Moricciani M. Morlet V. Nedorezov L. Nicoletti C. Perrin D. Rebreyend F. Renard M. Ripani L. Rosier P. Rossi N. Rudnev M. Sanzone C. Schaerf M. L. Sperduto A. Sudov M. Taiuti A. Turinge J. Van de Wiele A. Zucchiatti |
| Affiliation: | 1.LPC Université Blaise Pascal/IN2P3,Clermont-Ferrand,France;2.IN2P3,Institut de Physique Nucléaire,Orsay Cedex,France;3.INFN,Sezione di Genova and Università di Genova,Genova,Italy;4.INFN,Laboratori Nazionali del Sud and Università di Catania,Catania,Italy;5.INFN,Laboratori Nazionali di Frascati,Frascati,Italy;6.Institut de Science Nucléaires de Grenoble,Grenoble Cedex,France;7.Università di Roma “Tor Vergata”,Roma,Italy;8.sezione di Roma 2,INFN,Roma,Italy;9.Università di Torino,Torino,Italy;10.sezione di Torino,INFN,Torino,Italy;11.sezione Sanità and Istituto Superiore di Sanità,INFN,Roma,Italy;12.Institute for Nuclear Research,Moscow,Russia;13.Kurchatov Institute of Atomic Energy,Moscow,Russia;14.Institute of Theoretical and Experimental Physics,Moscow,Russia |
| Abstract: | The GRAAL tagged and polarized γ beam has been operating with a maximum energy of 1100 MeV. For the first time asymmetry results in ν photoproduction were obtained and will be shown. Interesting results have also been obtained for π0 and π+ photo-production, that largely confirm the already existing ones, but also extend in not yet explored angular and energetic regions, especially for backward scattering and energies greater than 900 MeV. |
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