Today the ATLAS and CMS experiments have reported the observation of a strong excess of proton-proton collision events compatible with the Higgs boson.
The observed excess is obtained by combining 5 channels in the case of CMS to reach a level of 4.9 sigma of statistical significance. ATLAS has presented so far the result from two channels and observes an excess of 5 sigma. The number of events and the type of decays observed are both compatible with the standard model Higgs boson with a mass of about 125 GeV, and given the statistical significance of both ATLAS and CMS observations this can no longer be a statistical fluctuation. So today we have the discovery of a new particle.
CERN has announced that the two experiments leading the search for the Higgs boson, ATLAS and CMS will update their results concerning the search for the Higgs boson tomorrow on July 4th.
Last December the ATLAS and CMS experiments reported they excluded a Higgs boson in the mass range above 130 GeV and up to 500 GeV and observed a modest excess of collisions compatible with a Higgs boson at about 125 GeV, but with a low statistical significance.
Christopher Savage is a Oskar Klein Fellow since the summer of 2009. He is working on direct detection of Dark Matter and seems to be very happy about it! I asked him to tell us more.
Why did you choose the OKC for doing a postdoc?
The broad focus on cosmology, with an emphasis on interaction between different areas, was very appealing. In addition, I had started working on capture of dark matter in stars and there is a lot of expertise in that area here in Stockholm (particularly Joakim Edsjö).
The ATLAS experiment has almost completed the analysis of the first 2 inverse femtobarns(*) of data provided by the Large Hadron Collider (LHC) until July this year.
On the forefront of the search for the Higgs boson, ATLAS and CMS, two of the LHC experiments aimed at measuring the Higgs boson signal, did not detect any signal excess so far.