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Latest from the LHC
Posted on February 7, 2012 by woit
CMS and ATLAS have just released final versions of their Higgs analyses for the 2011 data (the new CMS gamma-gamma analysis was previously discussed here). The preliminary versions of these were what was released last December, and the final versions don’t differ in a major way. The bottom line is still the same: there’s evidence for a Higgs around 125 GeV, of the sort that you would expect with this amount of data if it were really there, but the evidence is still too weak to claim discovery. The CMS papers are here, here and here, with the combination here. The ATLAS papers are here and here, combination here.
Check out Philip Gibbs to see if he updates his unofficial overall combination. Rumor is that the official CMS+ATLAS combination, along with the latest Tevatron Higgs results, will be released at Moriond (first week of March).
http://cdsweb.cern.ch/record/1422382/files/HIG-11-032-arXiv-gen.pdf
Combined results are reported from searches for the standard model Higgs boson in
proton-proton collisions at ps = 7 TeV in five Higgs boson decay modes: gg, bb, tt,
WW, and ZZ. The explored Higgs boson mass range is 110–600 GeV. The analysed
data correspond to an integrated luminosity of 4.6–4.8 fb_1. The expected excluded
mass range in the absence of the standard model Higgs boson is 118–543 GeV at 95% CL. The observed results exclude the standard model Higgs boson in the mass range 127–600 GeV at 95% CL, and in the mass range 129–525 GeV at 99% CL. An excess of events above the expected standard model background is observed at the low end of the explored mass range making the observed limits weaker than expected in the absence of a signal. The largest excess, with a local significance of 3.1s, is observed for a Higgs boson mass hypothesis of 124 GeV. The global significance of observing an excess with a local significance _3.1s anywhere in the search range 110–600 (110–145) GeV is estimated to be 1.5s (2.1s). More data are required to ascertain the origin of this excess.
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