The CMS experiment just released a new paper which I mention because it explicitly claims an excess, unlike the overwhelming majority of papers that agree with the Standard Model almost perfectly:
Search for the standard model Higgs boson produced in association with top quarks in multilepton final states (CMS PAS HIG-13-020)The heaviest known elementary particle is the top quark, \(t\), along with its antiparticle. Their mass is \((173\pm 1)\GeV\) or so. The second heaviest known elementary particle is the Higgs boson, \(h\), whose mass \((125.7\pm 0.4)\GeV\) is the only completely new number that the LHC has taught us so far.
In the search discussed in the paper above, they looked for events in which these three fatties (\(t\bar t h\)) were produced simultaneously and they subsequently decayed into final states with many leptons. And the Standard Model wasn't too perfect.
The most relevant figure is Figure 4 and I am sure that you are already curious what this image shows.
Here is what it looks like:
Click to zoom in.
You may see that the same-sign dilepton final states boast something like a 2.5-sigma excess over the Standard Model prediction. This excess gets inherited by the combination of the channels, too. Moreover, Figure 2 reveals that the excess resides squarely in the \(\mu^\pm\mu^\pm\) channel while the \(\mu^\pm e^\pm\) and \(e^\pm e^\pm\) channels agree with the Standard Model.
I have no immediate interpretation except that the CMS was designed and named to make discoveries using muons. ;-) But make no mistake about it: of course that exactly this final state – top-Higgs associated production with like-sign leptons – could be e.g. a sign of the gluino, the supersymmetric partner of the gluon! The gluino has been one of the most urgently expected superpartners at the LHC for almost two years.
The excess may also be related to the Christmas same-sign dimuon rumor.
If SUSY is too hard for you, let me just tell you that the gluino is a blonde vampire alchemist.