{"id":2121,"date":"2025-05-09T14:07:53","date_gmt":"2025-05-09T06:07:53","guid":{"rendered":"http:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/?page_id=2121"},"modified":"2025-05-09T14:07:53","modified_gmt":"2025-05-09T06:07:53","slug":"about-muons","status":"publish","type":"page","link":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/about-muons\/","title":{"rendered":"About Muons"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\"><strong>Muon Discovery and its Properties&nbsp;<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>In the Standard Model, muon is the second generation charged lepton.<\/li><li>The muon was discovered in cosmic rays by Anderson and Neddermeyer in 1936 [1]. <\/li><li>Initially, the muon was mistakenly identified as the Yukawa meson&nbsp;<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"351\" src=\"http:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-content\/uploads\/sites\/4\/2025\/05\/Screenshot-2025-05-09-at-1.58.01\u202fPM-1024x351.png\" alt=\"\" class=\"wp-image-2124\" srcset=\"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-content\/uploads\/sites\/4\/2025\/05\/Screenshot-2025-05-09-at-1.58.01\u202fPM-1024x351.png 1024w, https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-content\/uploads\/sites\/4\/2025\/05\/Screenshot-2025-05-09-at-1.58.01\u202fPM-300x103.png 300w, https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-content\/uploads\/sites\/4\/2025\/05\/Screenshot-2025-05-09-at-1.58.01\u202fPM-768x264.png 768w, https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-content\/uploads\/sites\/4\/2025\/05\/Screenshot-2025-05-09-at-1.58.01\u202fPM-1536x527.png 1536w, https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-content\/uploads\/sites\/4\/2025\/05\/Screenshot-2025-05-09-at-1.58.01\u202fPM.png 1754w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Muon and the Weak Interaction&nbsp;<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>Muons are produced through \u03c0 , K decay. <\/li><li>Muon subsequently decay into an electron and neutrinos.&nbsp;<\/li><li>Weak interaction violates parity.<\/li><li>Muons from \u03c0 , K decay are highly polarized.<\/li><li>High-energy electrons are emitted preferably in muon spin direction.<\/li><li>The asymmetry of the electrons is energy-dependent.&nbsp;<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Muon and the Building of the Standard Model&nbsp;<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>The parity problem has been questioned by Lee and Yang [3].<\/li><li>The violation was soon observed in the decay of Cobalt-60 and the muon [4]. <\/li><li>The observation helps establish the V-A theory, a basis for weak interaction in the standard model [5].&nbsp;<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">References<\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li>Anderson, C.D. &amp; Neddermeyer, S.H., <em>Phys. Rev. <\/em><strong>50<\/strong>, 263 (1936)<\/li><li>Lattes, C., Occhialini, G., Powell, <em>Nature <\/em><strong>159<\/strong>, 694-697 (1947)<\/li><li>T.D., Lee &amp; C.N.,Yang, <em>Phys. Rev. <\/em><strong>104, <\/strong>254 (1957)<\/li><li>Garwin, R.L., Lederman, L.M. &amp; Marcel, W., <em>Phys. Rev. <\/em><strong>105<\/strong>,1415 (1957)<\/li><li>Roberts, B.L., <em>J. Phys. Soc. Jpn<\/em>., <strong>76<\/strong>, 111009 (2007)&nbsp;<\/li><\/ol>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Muon Discovery and its Properties&nbsp; In the Standard Model, muon is the second generation charged lepton. The muon was discovered [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-2121","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/pages\/2121","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/comments?post=2121"}],"version-history":[{"count":4,"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/pages\/2121\/revisions"}],"predecessor-version":[{"id":2129,"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/pages\/2121\/revisions\/2129"}],"wp:attachment":[{"href":"https:\/\/web.tdli.sjtu.edu.cn\/kimsiang84\/wp-json\/wp\/v2\/media?parent=2121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}