{"id":299,"date":"2021-11-14T16:20:42","date_gmt":"2021-11-14T16:20:42","guid":{"rendered":"https:\/\/belle2.ijs.si\/public\/?page_id=299"},"modified":"2023-10-29T13:11:21","modified_gmt":"2023-10-29T13:11:21","slug":"electron-positron-events","status":"publish","type":"page","link":"https:\/\/belle2.ijs.si\/public\/home\/quark-colors\/examples\/electron-positron-events\/","title":{"rendered":"Electron\/Positron Events"},"content":{"rendered":"\n<p>Electron\/positron events distinguish themselves by having (almost) always<strong> exactly two tracks<\/strong> which are clearly visible in the detector.<\/p>\n\n\n\n<p>Since electrons and positrons (like most particles except for muons) get &#8220;caught&#8221; by the calorimeter, these tracks usually end there, which means that one can see a red energy deposition in the calorimeter. They can most easily be distringuished from <a href=\"https:\/\/belle2.ijs.si\/public\/home\/quark-colors\/examples\/muon-antimuon-events\/\">muons<\/a> by that fact that <strong>no or only very few green detector hits along the outer line<\/strong> are visible in the kaon-muon-calorimeter.<\/p>\n\n\n\n<p>Since only the electron and the positron are produced and they don\u2019t decay any further, these events usually have <strong>very little missing energy and high straightness<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Elektron\/Positron Ereignis 1\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/CdgeLyGCF9c?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Elektron\/Positron Ereignis 2\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/YiPbcdnPNOQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Elektron\/Positron Ereignis 3\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/8mu1KhSXt8g?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><strong><a href=\"https:\/\/belle2.ijs.si\/public\/wp-content\/uploads\/2022\/01\/examples_ee_eng.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">Example event displays (PDF):<\/a><\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1008\" height=\"756\" src=\"https:\/\/belle2.ijs.si\/public\/wp-content\/uploads\/2022\/01\/examples_ee_eng-1-1.png\" alt=\"\" class=\"wp-image-389\" srcset=\"https:\/\/belle2.ijs.si\/public\/wp-content\/uploads\/2022\/01\/examples_ee_eng-1-1.png 1008w, https:\/\/belle2.ijs.si\/public\/wp-content\/uploads\/2022\/01\/examples_ee_eng-1-1-300x225.png 300w, https:\/\/belle2.ijs.si\/public\/wp-content\/uploads\/2022\/01\/examples_ee_eng-1-1-768x576.png 768w\" sizes=\"auto, (max-width: 1008px) 100vw, 1008px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1008\" height=\"756\" src=\"https:\/\/belle2.ijs.si\/public\/wp-content\/uploads\/2022\/01\/examples_ee_eng-2-3.png\" alt=\"\" class=\"wp-image-390\" srcset=\"https:\/\/belle2.ijs.si\/public\/wp-content\/uploads\/2022\/01\/examples_ee_eng-2-3.png 1008w, https:\/\/belle2.ijs.si\/public\/wp-content\/uploads\/2022\/01\/examples_ee_eng-2-3-300x225.png 300w, https:\/\/belle2.ijs.si\/public\/wp-content\/uploads\/2022\/01\/examples_ee_eng-2-3-768x576.png 768w\" sizes=\"auto, (max-width: 1008px) 100vw, 1008px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1008\" height=\"756\" src=\"https:\/\/belle2.ijs.si\/public\/wp-content\/uploads\/2022\/01\/examples_ee_eng-3-1.png\" alt=\"\" class=\"wp-image-391\" srcset=\"https:\/\/belle2.ijs.si\/public\/wp-content\/uploads\/2022\/01\/examples_ee_eng-3-1.png 1008w, https:\/\/belle2.ijs.si\/public\/wp-content\/uploads\/2022\/01\/examples_ee_eng-3-1-300x225.png 300w, https:\/\/belle2.ijs.si\/public\/wp-content\/uploads\/2022\/01\/examples_ee_eng-3-1-768x576.png 768w\" sizes=\"auto, (max-width: 1008px) 100vw, 1008px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Electron\/positron events distinguish themselves by having (almost) always exactly two tracks which are clearly visible in the detector. Since electrons and positrons (like most particles except for muons) get &#8220;caught&#8221; by the calorimeter, these tracks usually end there, which means that one can see a red energy deposition in the calorimeter. They can most easily [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"parent":297,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-299","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/pages\/299","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/comments?post=299"}],"version-history":[{"count":8,"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/pages\/299\/revisions"}],"predecessor-version":[{"id":488,"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/pages\/299\/revisions\/488"}],"up":[{"embeddable":true,"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/pages\/297"}],"wp:attachment":[{"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/media?parent=299"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}