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The Belle detector was located at the collision point of the asymmetric-energy\u00a0electron\u2013positron\u00a0collider,\u00a0KEKB. Belle at KEKB together with the\u00a0BaBar experiment\u00a0at the\u00a0PEP-II\u00a0accelerator at\u00a0SLAC\u00a0were known as the\u00a0B-factories\u00a0as they collided electrons with positrons at the center-of-momentum energy equal to the mass of the\u00a0\u03d2(4S)\u00a0resonance\u00a0which decays to pairs of\u00a0B mesons.<\/p>\n\n\n\n
![\"\"](\"https:\/\/yhep.yonsei.ac.kr\/wp-content\/uploads\/2021\/03\/belle4.jpg\")
The Belle detector was a\u00a0hermetic\u00a0multilayer\u00a0particle detector\u00a0with large\u00a0solid angle\u00a0coverage, vertex location with precision on the order of tens of micrometres (provided by a silicon vertex detector), good distinction between\u00a0pions\u00a0and\u00a0kaons\u00a0in the momenta range from 100\u00a0MeV\/c\u00a0to few GeV\/c (provided by a\u00a0Cherenkov\u00a0detector), and a few-percent precision electromagnetic\u00a0calorimeter\u00a0(made of\u00a0CsI(Tl)\u00a0scintillating crystals).<\/p>\n\n\n\n
The Belle II experiment is an upgrade of Belle that was approved in June 2010. It is currently being commissioned, and is anticipated to start operation in 2018. Belle II is located at SuperKEKB (an upgraded KEKB accelerator) which is intended to provide a factor 40 larger integrated luminosity.<\/p>\n\n\n
![\"\"](\"https:\/\/yhep.yonsei.ac.kr\/wp-content\/uploads\/2021\/03\/DndqHm3U0AIQfhz.jpg\")
Much of the original Belle detector has been upgraded\u00a0to cope with the higher instantaneous luminosity provided by the SuperKEKB accelerator.\u00a0Close to the beam pipe, the two innermost layers of Belle’s silicon vertex detector have been replaced by a depleted\u00a0field effect transistor\u00a0(DEPFET) pixel detector, and a larger the silicon vertex detector. <\/p>\n\n\n\n
A larger central tracking system \u2013 a\u00a0wire drift chamber, has been installed.\u00a0Two new particle identification systems have been installed in the forward endcap (consisting of an\u00a0aerogel\u00a0ring-imaging Cherenkov detector) and in the barrel (consisting of quartz bars utilising\u00a0totally internally reflected\u00a0Cherenkov\u00a0photons and measuring the time of propagation).<\/p>\n\n\n\n
The original\u00a0CsI(Tl) electromagnetic\u00a0calorimeter\u00a0has been re-used (a new pure CsI calorimeter is being designed for the forward endcap\u00a0to be installed at a later stage). The calorimeter readout electronics have been upgraded. Finally, scintillators have been installed in the forward endcap and inner layers of Belle’s\u00a0K0<\/sup>L<\/sub>\u00a0and muon detector, the original resistive plate chambers (RPCs) from Belle are reused in the outer layers of the barrel.<\/p>\n\n\n\n The target dataset is 50ab\u22121<\/sup> at Belle II compared to 988fb\u22121<\/sup> (with 711fb\u22121<\/sup> at the \u03a5(4S) energy) at Belle.<\/p>\n\n\n\n After the Standard Model has been accomplished with detecting the evidence of Higg Boson at CERN, 2012, the major interests of particle physicists are shifted to Beyond-Standard Model (BSM). The most attractive, and important topic is “Dark Matter”.\u00a0<\/p>\n\n\n\n With several unignoreable evidences, Astrophysicists say that our visible universe are only 4 percent of total universe’s Mass-Energy. There might be ‘Something” consist our universe, without interacting electromagnetic force. (So it’s Dark) <\/p>\n<\/div>\n<\/div>\n\n\n\n In Yonsei High Energy Physics Lab, we are looking for evidence of dark matter with Belle \/ Belle II experiment data. Extracting B decays contain dark mode, and calculate the upper limit of branching fraction would give nice glance of proving SM-DM interactions.<\/p>\n","protected":false},"excerpt":{"rendered":" Belle \/ Belle II Experiment The Belle experiment was a particle physics experiment conducted by the Belle Collaboration, an international collaboration of more than 400 physicists and engineers, at the High Energy Accelerator Research Organisation (KEK) in Tsukuba, Ibaraki Prefecture, Japan. The experiment ran from 1999 to 2010. The Belle detector was located at the collision point of the asymmetric-energy\u00a0electron\u2013positron\u00a0collider,\u00a0KEKB. Belle at KEKB […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"gt_page_layout":"","gt_hide_page_title":false,"gt_remove_bottom_margin":false,"footnotes":""},"class_list":["post-7","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/yhep.yonsei.ac.kr\/index.php\/wp-json\/wp\/v2\/pages\/7","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yhep.yonsei.ac.kr\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/yhep.yonsei.ac.kr\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/yhep.yonsei.ac.kr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yhep.yonsei.ac.kr\/index.php\/wp-json\/wp\/v2\/comments?post=7"}],"version-history":[{"count":13,"href":"https:\/\/yhep.yonsei.ac.kr\/index.php\/wp-json\/wp\/v2\/pages\/7\/revisions"}],"predecessor-version":[{"id":504,"href":"https:\/\/yhep.yonsei.ac.kr\/index.php\/wp-json\/wp\/v2\/pages\/7\/revisions\/504"}],"wp:attachment":[{"href":"https:\/\/yhep.yonsei.ac.kr\/index.php\/wp-json\/wp\/v2\/media?parent=7"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Dark Matter Search<\/h1>\n\n\n\n
![\"\"](\"https:\/\/yhep.yonsei.ac.kr\/wp-content\/uploads\/2021\/03\/DarkMatterPie.jpg\")
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