Higgs of mass 125.5 GeV discovered

This morning physicists at CERN have finally announced that they have found a new boson with a significance of 5.0 sigma which is required to claim a discovery. Both the CMS and ATLAS detectors agree with the finding of a new boson with a mass of around 125.5 GeV and is consistent with the standard model. However, this is just the beginning, much more data is needed to find out more about its properties.

Due to this new discovery CERN has now decided to delay the LHC’s planned two year shutdown by 3 months. The planned shutdown aims to upgrade the LHC so it can reach 14 TeV.

So the Higgs has finally been found however, there is still no sign of supersymetry, which was tipped to be discovered before the Higgs.

Find out more on CERN’s homepage: http://public.web.cern.ch/public/

Also catch the live press conference here: http://webcast.web.cern.ch/webcast/

ATLAS and CMS experiments present Higgs search status

An event showing four muons (red tracks) from a proton-proton collision in ATLAS. This event is consistent with two Z particles decaying into two muons each.

In a seminar held at CERN on the 13 December 2011, the ATLAS and CMS experiments presented the status of their searches for the Standard Model Higgs boson. Their results are based on the analysis of considerably more data than those presented at the summer conferences, sufficient to make significant progress in the search for the Higgs boson, but not enough to make any conclusive statement on the existence or non-existence of the elusive Higgs. The main conclusion is that the Standard Model Higgs boson, if it exists, is most likely to have a mass constrained to the range 116-130 GeV by the ATLAS experiment, and 115-127 GeV by CMS. Tantalising hints have been seen by both experiments in this mass region, but these are not yet strong enough to claim a discovery.