{"id":5283,"date":"2012-11-13T11:15:27","date_gmt":"2012-11-13T16:15:27","guid":{"rendered":"http:\/\/www.math.columbia.edu\/~woit\/wordpress\/?p=5283"},"modified":"2012-11-14T18:42:59","modified_gmt":"2012-11-14T23:42:59","slug":"new-higgs-results","status":"publish","type":"post","link":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/?p=5283","title":{"rendered":"New Higgs Results"},"content":{"rendered":"

New results about the Higgs should appear over the next day or so, perhaps first here<\/a> and here<\/a>. First to appear is the CMS tau-tau result<\/a> which is a signal strength of .72 +\/- .52 the SM value.<\/p>\n

Will update this posting with the results as they appear.<\/p>\n

I guess the rumors were right: no update from ATLAS for gamma-gamma, they’re just presenting<\/a> the earlier data: signal strength of 1.8 +\/- .5 times the SM value. “Ambitious campaign underway to include a larger data-set.”<\/p>\n

ATLAS WW channel signal strength is 1.5 +\/- .6 times the SM value (see here<\/a>). For some reason they are only using 2012 8 TeV data, not combining with the 7 TeV data.<\/p>\n

Atlas tau-tau signal strength is .7 +\/- .64 times the SM value (see here<\/a>). Very similar to the CMS value. They are not yet sensitive to the bb channel, where the Tevatron has the advantage and has evidence of a signal.<\/p>\n

Update<\/strong>: All new results are out now, but rather anti-climactic since neither CMS nor ATLAS is reporting new results for the channel with the strongest signal (gamma-gamma), where the signal strength may be anomalously high. ATLAS is also not reporting for the other high statistics channel (ZZ). CMS is, with signal strength .8 +.35\/-.28 the SM value. They also claim to rule out (at 2.5 sigma) the hypothesis that this is a pseudoscalar rather than scalar. Everything reported is in line with the SM, but for the most interesting numbers we may have to wait until next March (Moriond).<\/p>\n

For much more details about all this, see Tommaso Dorigo here<\/a> and here<\/a>, Matt Strassler here<\/a> and here<\/a>, Philip Gibbs here<\/a>. For primary sources, CMS here<\/a>, ATLAS here<\/a>, presentations here<\/a>.<\/p>\n

Update<\/strong>: For another excellent source, see Jester<\/a>, who has the scoop on why ATLAS and CMS didn’t update some channels:<\/p>\n

It came to a point where the most exciting thing about the new Higgs release was what wasn’t there \ud83d\ude42 It is difficult not to notice that the easy Higgs search channels, h\u2192\u03b3\u03b3 and ATLAS h\u2192ZZ\u21924l, were not updated. In ATLAS, the reason was the discrepancy between the Higgs masses measured in those 2 channels: the best fit mass came out 123.5 GeV in the h\u2192ZZ\u21924l, and 126.5 GeV in the h\u2192\u03b3\u03b3 channel. The difference is larger than the estimated mass resolution, therefore ATLAS decided to postpone the update in order to carefully investigate the problem. On the other hand in CMS, after unblinding the new analysis in the h\u2192\u03b3\u03b3 channel, the signal strength went down by more than they were comfortable with; in particular the new results are not very consistent with what was presented on the 4th of July. Most likely, all these analyses will be released before the end of the year, after more cross-checking is done.<\/p><\/blockquote>\n

Update<\/strong>: Two interesting workshops on prospects for a Higgs factory are being held at Fermilab this week. See here<\/a> for one that is on-going, see here<\/a> for Tuesday’s one-day mini-workshop on prospects for a muon collider Higgs factory. I’d never seen much before about the idea of using a gamma-gamma collider to study the Higgs, curious if that’s really technologically viable. <\/p>\n","protected":false},"excerpt":{"rendered":"

New results about the Higgs should appear over the next day or so, perhaps first here and here. First to appear is the CMS tau-tau result which is a signal strength of .72 +\/- .52 the SM value. Will update … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[9],"tags":[],"class_list":["post-5283","post","type-post","status-publish","format-standard","hentry","category-experimental-hep-news"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/5283","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5283"}],"version-history":[{"count":15,"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/5283\/revisions"}],"predecessor-version":[{"id":5302,"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/5283\/revisions\/5302"}],"wp:attachment":[{"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5283"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5283"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5283"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}