{"id":2880,"date":"2017-08-14T16:50:33","date_gmt":"2017-08-14T14:50:33","guid":{"rendered":"https:\/\/infnimport.sitebysite.it\/2017\/08\/14\/la-luce-interagisce-con-se-stessa-alle-alte-energie-confermata-per-la-prima-volta-la-previsione-della-teoria-qed-2\/"},"modified":"2025-01-12T16:37:28","modified_gmt":"2025-01-12T15:37:28","slug":"la-luce-interagisce-con-se-stessa-alle-alte-energie-confermata-per-la-prima-volta-la-previsione-della-teoria-qed-2","status":"publish","type":"post","link":"https:\/\/infn.sitebysite.it\/en\/la-luce-interagisce-con-se-stessa-alle-alte-energie-confermata-per-la-prima-volta-la-previsione-della-teoria-qed-2\/","title":{"rendered":"LIGHT INTERACTS WITH ITSELF AT HIGH ENERGY: THE PREDICTION OF QED HAS BEEN CONFIRMED FOR THE FIRST TIME"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\" alignleft size-full wp-image-2876\" src=\"https:\/\/infnimport.sitebysite.it\/wp-content\/uploads\/2017\/08\/ATLAS_2.jpg\" alt=\"ATLAS 2\" width=\"250\" height=\"160\" style=\"margin: 10px; float: left;\" \/> The ATLAS experiment at the LHC has observed the first direct evidence of high energy photon-on-photon scattering. This is a very rare process in which two photons interact and change impulse, energy and direction. The result, published in August on Nature Physics, confirms one of the oldest predictions of quantum electrodynamics (QED), and is the first direct evidence of light interacting with itself at high energy, a phenomenon that is not possible in classical theories of electromagnetism. Physicists obtained the result using data produced in collisions between lead ions. As bunches of lead ions are accelerated, an enormous flux of surrounding photons is generated, which can interact with one another, giving rise to the phenomenon of photon-on-photon scattering. These interactions are known as &#8220;ultra-peripheral collisions&#8221;. Finding evidence of this rare phenomenon required the development of a new &lsquo;trigger&rsquo; for the ATLAS detector. The new trigger&rsquo;s success in selecting the events demonstrates the power and flexibility of the system, as well as the skill and expertise of the analysts and groups who designed and developed it.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The ATLAS experiment at the LHC has observed the first direct evidence of high energy photon-on-photon scattering. This is a&#8230;<\/p>\n","protected":false},"author":2,"featured_media":4258,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[297],"tags":[],"class_list":["post-2880","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>LIGHT INTERACTS WITH ITSELF AT HIGH ENERGY: THE PREDICTION OF QED HAS BEEN CONFIRMED FOR THE FIRST TIME - Istituto Nazionale di Fisica Nucleare<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LIGHT INTERACTS WITH ITSELF AT HIGH ENERGY: THE PREDICTION OF QED HAS BEEN CONFIRMED FOR THE FIRST TIME - Istituto Nazionale di Fisica Nucleare\" \/>\n<meta property=\"og:description\" content=\"The ATLAS experiment at the LHC has observed the first direct evidence of high energy photon-on-photon scattering. This is a...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/infn.sitebysite.it\/en\/la-luce-interagisce-con-se-stessa-alle-alte-energie-confermata-per-la-prima-volta-la-previsione-della-teoria-qed-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Istituto Nazionale di Fisica Nucleare\" \/>\n<meta property=\"article:published_time\" content=\"2017-08-14T14:50:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-01-12T15:37:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/infn.sitebysite.it\/wp-content\/uploads\/2017\/08\/ATLAS_2.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"700\" \/>\n\t<meta property=\"og:image:height\" content=\"447\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Francesca Cuicchio\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Francesca Cuicchio\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/infn.sitebysite.it\/en\/la-luce-interagisce-con-se-stessa-alle-alte-energie-confermata-per-la-prima-volta-la-previsione-della-teoria-qed-2\/\",\"url\":\"https:\/\/infn.sitebysite.it\/en\/la-luce-interagisce-con-se-stessa-alle-alte-energie-confermata-per-la-prima-volta-la-previsione-della-teoria-qed-2\/\",\"name\":\"LIGHT INTERACTS WITH ITSELF AT HIGH ENERGY: THE PREDICTION OF QED HAS BEEN CONFIRMED FOR THE FIRST TIME - 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