{"id":859,"date":"2003-07-09T15:50:59","date_gmt":"2003-07-09T13:50:59","guid":{"rendered":"http:\/\/www.randieri.com\/?post_type=jetpack-portfolio&#038;p=859"},"modified":"2018-03-09T11:42:12","modified_gmt":"2018-03-09T10:42:12","slug":"english-the-double-%cf%800-and-%cf%89-meson-photoproduction-at-graal","status":"publish","type":"post","link":"https:\/\/www.randieri.com\/en\/english-the-double-%cf%800-and-%cf%89-meson-photoproduction-at-graal\/","title":{"rendered":"(English) The Double \u03c0\u00b0 and \u03c9-Meson Photoproduction at Graal"},"content":{"rendered":"<p style=\"text-align: justify;\">The double \u03c0<sup>0<\/sup>\u00a0photoproduction off the proton has been measured in the beam energy range of 0.65 1.5GeV. <!--more-->The total and differential cross sections and the \u03a3 beam asymmetry were extracted. The total cross section measured for the first time in the third resonance region of the nucleon shows a prominent peak.\u00a0The interpretation of these results by two independent theoretical models infers mostly the selective excitation of P<sub>11<\/sub>&#8211; and D<sub>13<\/sub>-nucleon resonances.<\/p>\n<p style=\"text-align: center;\"><div class=\"white-space\"><\/div><\/p>\n<p class=\"txt Stile1 Stile1\" style=\"text-align: center;\">\n<p style=\"text-align: center;\">________<\/p>\n<p style=\"text-align: justify;\">Y. Assafiri, O. Bartalini, V. Bellini, J. P. Bocquet, S. Bouchigny, M. Capogni, M. Castoldi, A. D&#8217;Angelo, J. P. Didelez, R. Di Salvo, A. Fantini, L. Fichen, G. Gervino, F. Ghio, B. Girolami, A. Giusa, M. Guidal, E. Hourany, V. Kouznetsov, R. Kunne, JM. Laget, A. Lapik, P. Levi Sandri, A. Lleres, D. Moricciani, V. Nedorezov, D. Rebreyend, <strong>C. Randieri, <\/strong>F. Renard, N. Rudnev, C. Schaerf, M. Sperduto, M. C. Sutera, A. Turinge, Q. Zhao, A. Zucchiatti (2003).<\/p>\n<p style=\"text-align: justify;\"><strong>NSTAR 2002,\u00a0Proceedings of the Workshop on the Physics of Excited Nucleons, Pittsburg, Pennsylvania (USA), 9-12 October 2002. <em>World Scientific Publishing Co. Pte. Ltd.<\/em>, July 2003, pp. 261-266, doi: 10.1142\/9789812705174 0037.<\/strong><\/p>\n<p style=\"text-align: center;\">________<\/p>\n<p style=\"text-align: justify;\"><img data-recalc-dims=\"1\" decoding=\"async\" class=\"size-full wp-image-2253 alignleft\" src=\"https:\/\/i0.wp.com\/www.intellisystem.it\/Intellisystem\/wp-content\/uploads\/Loghi%20Pubblicazioni\/World-Scientific.jpg\" alt=\"World Scientific\" \/><em>World Scientific Publishing Company was established in 1981 with only 5 employees in a tiny office. Today, the company employs more than 200 staff at its headquarters in Singapore and 450 globally. It has offices in New Jersey, London, Geneva, Hong Kong, Taipei, Beijing, Shanghai, Tianjin and Chennai. In about 3 decades, it has established itself as one of the leading scientific publishers in the world, and the largest international scientific publisher in the Asia-Pacific region. World Scientific publishes about 600 new titles a year and 130 journals in various fields.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The double \u03c00\u00a0photoproduction off the proton has been measured in the beam energy range of 0.65 1.5GeV.<\/p>\n","protected":false},"author":1,"featured_media":1919,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"image","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[161,130],"tags":[180,190,189,165,78,187,188],"class_list":["post-859","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-fisica-nucleare","category-pubblicazioni-scientifiche","tag-experimental-physics","tag-graal-experiment","tag-nuclear-detectors","tag-nuclear-engineering","tag-nuclear-physics","tag-particle-physics","tag-research-project","post_format-post-format-image"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"The double \u03c00 and \u03c9-meson photoproduction have been measured at GRAAL. The total and differential cross sections and the beam asymmetry were deduced. In the double \u03c00 channel, the total cross section is dominated by two peaks at 0.7 and 1.1 GeV of beam energy, the second one having been seen for the first time. The interpretation of the double \u03c00 channel was performed with Laget model using a few diagrams mainly built on the excitation of P11 and D13. 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The total and differential cross sections and the beam asymmetry were deduced. In the double \u03c00 channel, the total cross section is dominated by two peaks at 0.7 and 1.1 GeV of beam energy, the second one having been seen for the first time. The interpretation of the double \u03c00 channel was performed with Laget model using a few diagrams mainly built on the excitation of P11 and D13. 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The total and differential cross sections and the beam asymmetry were deduced. In the double \u03c00 channel, the total cross section is dominated by two peaks at 0.7 and 1.1 GeV of beam energy, the second one having been seen for the first time. The interpretation of the double \u03c00 channel was performed with Laget model using a few diagrams mainly built on the excitation of P11 and D13. 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