{"id":2401,"date":"2011-11-18T20:45:52","date_gmt":"2011-11-18T20:45:52","guid":{"rendered":"http:\/\/spinor.info\/weblog\/?p=2401"},"modified":"2011-11-18T20:45:52","modified_gmt":"2011-11-18T20:45:52","slug":"pesky-opera-neutrinos","status":"publish","type":"post","link":"https:\/\/spinor.info\/weblog\/?p=2401","title":{"rendered":"Pesky OPERA neutrinos"},"content":{"rendered":"<p>The <a href=\"http:\/\/arxiv.org\/abs\/1109.4897v2\">latest OPERA results<\/a> are in and they are very interesting. They used extremely tight bunches of protons this time, with a pulse width of only a few nanoseconds:<\/p>\n<p><a href=\"http:\/\/spinor.info\/weblog\/wp-content\/uploads\/2011\/11\/New_opera_pulses.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2402 aligncenter\" title=\"New_opera_pulses\" src=\"http:\/\/spinor.info\/weblog\/wp-content\/uploads\/2011\/11\/New_opera_pulses.png\" alt=\"\" width=\"400\" height=\"216\" srcset=\"https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2011\/11\/New_opera_pulses.png 400w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2011\/11\/New_opera_pulses-300x162.png 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><\/p>\n<p>These bunches allowed the team to correlate individual neutrino events with the bunches that originated them. This is what they saw:<\/p>\n<p><a href=\"http:\/\/spinor.info\/weblog\/wp-content\/uploads\/2011\/11\/New_opera_results.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2403 aligncenter\" title=\"New_opera_results\" src=\"http:\/\/spinor.info\/weblog\/wp-content\/uploads\/2011\/11\/New_opera_results.png\" alt=\"\" width=\"300\" height=\"296\" srcset=\"https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2011\/11\/New_opera_results.png 300w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2011\/11\/New_opera_results-96x96.png 96w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2011\/11\/New_opera_results-24x24.png 24w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2011\/11\/New_opera_results-36x36.png 36w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2011\/11\/New_opera_results-48x48.png 48w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2011\/11\/New_opera_results-64x64.png 64w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Numerically, the result is 62.1 \u00b1 3.7 ns, consistent with their previously claimed result.<\/p>\n<p>In my view, there are four possible categories of things that could have gone wrong with the OPERA experiment:<\/p>\n<ol>\n<li>Incorrectly synchronized clocks;<\/li>\n<li>Incorrectly measured distance;<\/li>\n<li>Unaccounted-for delays in the apparatus;<\/li>\n<li><del>Statistical uncertainties<\/del>.<\/li>\n<\/ol>\n<p>Because this new result does not rely on the statistical averaging of a large number of events, item 4 is basically out. One down, three to go.<\/p>\n<fb:like href='https:\/\/spinor.info\/weblog\/?p=2401' send='true' layout='standard' show_faces='true' width='450' height='65' action='like' colorscheme='light' font='lucida grande'><\/fb:like>","protected":false},"excerpt":{"rendered":"<p>The latest OPERA results are in and they are very interesting. They used extremely tight bunches of protons this time, with a pulse width of only a few nanoseconds: These bunches allowed the team to correlate individual neutrino events with the bunches that originated them. This is what they saw: Numerically, the result is 62.1 <a href='https:\/\/spinor.info\/weblog\/?p=2401' class='excerpt-more'>[&#8230;]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-2401","post","type-post","status-publish","format-standard","hentry","category-physics","category-3-id","post-seq-1","post-parity-odd","meta-position-corners","fix"],"_links":{"self":[{"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/posts\/2401","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2401"}],"version-history":[{"count":5,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/posts\/2401\/revisions"}],"predecessor-version":[{"id":2408,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/posts\/2401\/revisions\/2408"}],"wp:attachment":[{"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2401"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2401"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2401"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}