http:\/\/belle2.ijs.si\/masterclass<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Decay of a J\/\u03c8 to leptons Plot the mass distribution of a J\/\u03c8 which decays to two leptons:< You will find a peak at a mass of J\/\u03c8 at 3.10 The probability for the production of a J\/\u03c8 is very small, so you will have to process at least 100.000 events. http:\/\/belle2.ijs.si\/masterclass<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-65","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/pages\/65","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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/comments?post=65"}],"version-history":[{"count":7,"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/pages\/65\/revisions"}],"predecessor-version":[{"id":196,"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/pages\/65\/revisions\/196"}],"wp:attachment":[{"href":"https:\/\/belle2.ijs.si\/public\/wp-json\/wp\/v2\/media?parent=65"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"\[J/\psi \longrightarrow e^+ e^-\quad\text{or}\quad J/ψ \longrightarrow \mu^+ \mu^-\]\"](\"https:\/\/belle2.ijs.si\/public\/wp-content\/ql-cache\/quicklatex.com-a50af58d7cf95b025558021eca82e448_l3.png\" "\\"Rendered")
<\/p>\n![\"\mathrm{GeV}/c^2\"](\"https:\/\/belle2.ijs.si\/public\/wp-content\/ql-cache\/quicklatex.com-00c365c5d7f279a1e40a30de391e0e94_l3.png\" "\\"Rendered")
<\/p>\n