{"id":135955,"date":"2022-02-22T21:23:05","date_gmt":"2022-02-23T05:23:05","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2022\/02\/high-precision-measurement-of-the-charm-oscillation-parameter-ycp-ycpk%cf%80-using-decays-of-d0-mesons-to-two-light-mesons"},"modified":"2022-02-22T21:23:05","modified_gmt":"2022-02-23T05:23:05","slug":"high-precision-measurement-of-the-charm-oscillation-parameter-ycp-ycpk%cf%80-using-decays-of-d0-mesons-to-two-light-mesons","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2022\/02\/high-precision-measurement-of-the-charm-oscillation-parameter-ycp-ycpk%cf%80-using-decays-of-d0-mesons-to-two-light-mesons","title":{"rendered":"High precision measurement of the charm oscillation parameter yCP \u2014 yCPK\u03c0 using decays of D0 mesons to two light mesons"},"content":{"rendered":"<p><a class=\"aligncenter blog-photo\" href=\"https:\/\/lifeboat.com\/blog.images\/high-precision-measurement-of-the-charm-oscillation-parameter-ycp-ycpkcf80-using-decays-of-d0-mesons-to-two-light-mesons2.jpg\"><\/a><\/p>\n<p>Yesterday, LHCb submitted for publication new results of matter-antimatter oscillations using decays of charm particles, significantly improving the current experimental knowledge!<\/p>\n<p>Read our news: <a href=\"https:\/\/lhcb-outreach.web.cern.ch\/2022\/02\/21\/high-precision-measurement-of-the-charm-oscillation-parameter-ycp-ycpk&#x0025;cf&#x0025;80-using-decays-of-d0-mesons-to-two-light-mesons\/\">https:\/\/lhcb-outreach.web.cern.ch\/2022\/02\/21\/high-precision-\u2026ht-mesons\/<\/a><\/p>\n<hr>\n<p>Today, the LHCb Collaboration submitted for publication a paper that reports the results of the high precision measurement of the charm oscillation (mixing) parameter y<sub>CP<\/sub> \u2013 y<sub>CP<\/sub><sup>K\u03c0<\/sup> using two body D<sup>0<\/sup> meson decays. The result is more precise than the current world average value by a factor of four.<\/p>\n<p>The neutral meson particle-antiparticle systems, B<sub>s<\/sub><sup>0<\/sup>\u2212B<sub>s<\/sub><sup>0<\/sup>, B<sup>0<\/sup>\u2013B<sup>0<\/sup>, D<sup>0<\/sup>\u2013D<sup>0<\/sup> and K<sup>0<\/sup>\u2013K<sup>0<\/sup> oscillate (transform into their antiparticle and back) with very different frequencies. The B<sub>s<\/sub><sup>0<\/sup>\u2212B<sub>s<\/sub><sup>0<\/sup> oscillations are the fastest, about 3 million million times per second (3\u00d710<sup>12<\/sup>). The oscillations B<sup>0<\/sup>\u2013B<sup>0<\/sup> are about 37 times slower while the oscillations D<sup>0<\/sup>\u2013D<sup>0<\/sup> are even slower; the oscillation period is over one hundred times larger than the average lifetime of a D<sup>0<\/sup> meson. Therefore only very few D<sup>0<\/sup> mesons have the time to oscillate before decaying.<\/p>\n<p>The quantum mechanical treatment of neutral charm meson oscillations leads to two neutral mesons, D<sub>1<\/sub> and D<sub>2<\/sub>, each with their own mass, m<sub>1<\/sub> and m<sub>2<\/sub>, and typical lifetime represented by their decay width, \u0393<sub>1<\/sub> and \u0393<sub>2<\/sub>. The D<sup>0<\/sup>-D<sup>0<\/sup> oscillations are described by the two dimensionless parameters, x=(m<sub>1<\/sub>-m<sub>2<\/sub>)\/\u0393, determining the frequency of oscillations, and y=(\u0393<sub>1<\/sub>-\u0393<sub>2<\/sub>)\/\u0393, in which \u0393 is the average width, (\u0393<sub>1<\/sub>+\u0393<sub>2<\/sub>)\/2.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Yesterday, LHCb submitted for publication new results of matter-antimatter oscillations using decays of charm particles, significantly improving the current experimental knowledge! Read our news: https:\/\/lhcb-outreach.web.cern.ch\/2022\/02\/21\/high-precision-\u2026ht-mesons\/ Today, the LHCb Collaboration submitted for publication a paper that reports the results of the high precision measurement of the charm oscillation (mixing) parameter yCP \u2013 yCPK\u03c0 using two body [\u2026]<\/p>\n","protected":false},"author":359,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[48,1617],"tags":[],"class_list":["post-135955","post","type-post","status-publish","format-standard","hentry","category-particle-physics","category-quantum-physics"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/135955","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/359"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=135955"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/135955\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=135955"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=135955"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=135955"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}