{"id":8217,"date":"1998-08-31T23:22:07","date_gmt":"1998-08-31T21:22:07","guid":{"rendered":"https:\/\/www.jassemajaka.com\/?p=8217"},"modified":"2019-02-15T21:22:33","modified_gmt":"2019-02-15T19:22:33","slug":"new-measurement-of-%cf%83-beam-asymmetry-for-%ce%b7-meson-photoproduction-on-the-proton","status":"publish","type":"post","link":"https:\/\/www.jassemajaka.com\/?p=8217","title":{"rendered":"New Measurement of \u03a3 Beam Asymmetry for \u03b7 Meson Photoproduction on the Proton"},"content":{"rendered":"<div class=\"content\" dir=\"ltr\" data-loaded=\"no\">\n<div>\n<div>\n<div class=\"medium-9 columns\">\n<h3>New Measurement of <span class=\"aps-inline-formula\"><span id=\"MathJax-Element-1-Frame\" class=\"mjx-chtml MathJax_CHTML\" tabindex=\"0\"><span id=\"MJXc-Node-1\" class=\"mjx-math\"><span id=\"MJXc-Node-2\" class=\"mjx-mrow\"><span id=\"MJXc-Node-3\" class=\"mjx-mi\"><span class=\"mjx-char MJXc-TeX-math-I\">\u03a3<\/span><\/span><\/span><\/span><\/span><\/span> Beam Asymmetry for <span class=\"aps-inline-formula\"><span id=\"MathJax-Element-2-Frame\" class=\"mjx-chtml MathJax_CHTML\" tabindex=\"0\"><span id=\"MJXc-Node-4\" class=\"mjx-math\"><span id=\"MJXc-Node-5\" class=\"mjx-mrow\"><span id=\"MJXc-Node-6\" class=\"mjx-mi\"><span class=\"mjx-char MJXc-TeX-math-I\">\u03b7<\/span><\/span><\/span><\/span><\/span><\/span> Meson Photoproduction on the Proton<\/h3>\n<h5 class=\"authors\">J. Ajaka <em>et al.<\/em><\/h5>\n<h5 class=\"pub-info\">Phys. Rev. Lett. <b>81<\/b>, 1797 \u2013 Published 31 August 1998<\/h5>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p dir=\"ltr\">We present new \u03a3 beam asymmetry data for \u03b7 meson photoproduction on the proton, using a novel tagged, laser backscattered, linearly polarized photon beam up to 1.1 GeV. The data show large, positive asymmetries, at all incident photon energies. In addition to the S11(1535) and D13(1520) resonances necessary to reproduce the cross sections, P13(1720) and D15(1675) \u201cfour stars\u201d resonances contribute to the \u03a3 observable, but cannot reproduce the strong forward asymmetries measured at energies higher than 900 MeV.<\/p>\n<p dir=\"ltr\">Received 2 February 1998<\/p>\n<p dir=\"ltr\"><span class=\"doi\">DOI: <\/span><a href=\"https:\/\/doi.org\/10.1103\/PhysRevLett.81.1797\" target=\"_blank\" rel=\"noopener\"><span class=\"doi-field\">https:\/\/doi.org\/10.1103\/PhysRevLett.81.1797<\/span><\/a><\/p>\n<section id=\"rights\" dir=\"ltr\">\u00a91998 American Physical Society&nbsp;<\/p>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>We present new \u03a3 beam asymmetry data for \u03b7 meson photoproduction on the proton, using a novel tagged, laser backscattered, linearly polarized photon beam up to 1.1 GeV. The data show large, positive asymmetries, at all incident photon energies. In addition to the S11(1535) and D13(1520) resonances necessary to reproduce the cross sections, P13(1720) and D15(1675) \u201cfour stars\u201d resonances contribute to the \u03a3 observable, but cannot reproduce the strong forward asymmetries measured at energies higher than 900 MeV.<\/p>\n","protected":false},"author":12,"featured_media":8219,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[50],"tags":[788,791,790,787,676],"class_list":["post-8217","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-50","tag-eta-meson","tag-eta-photoproduction","tag-hadronic-physics","tag-physical-review-letters","tag-scientific-article"],"jetpack_featured_media_url":"https:\/\/www.jassemajaka.com\/wp-content\/uploads\/1998\/08\/S-observable-at-different-incident-g-energies-corresponding-to-the-photoproduction-of.png","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paTyQg-28x","_links":{"self":[{"href":"https:\/\/www.jassemajaka.com\/index.php?rest_route=\/wp\/v2\/posts\/8217","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jassemajaka.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jassemajaka.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jassemajaka.com\/index.php?rest_route=\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jassemajaka.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8217"}],"version-history":[{"count":3,"href":"https:\/\/www.jassemajaka.com\/index.php?rest_route=\/wp\/v2\/posts\/8217\/revisions"}],"predecessor-version":[{"id":8293,"href":"https:\/\/www.jassemajaka.com\/index.php?rest_route=\/wp\/v2\/posts\/8217\/revisions\/8293"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jassemajaka.com\/index.php?rest_route=\/wp\/v2\/media\/8219"}],"wp:attachment":[{"href":"https:\/\/www.jassemajaka.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8217"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jassemajaka.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8217"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jassemajaka.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8217"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}