The Higgs at last?

So 2011 runs out, and Europe and North America have shut down for the holiday season. Before CERN, its physicists and staff all left to make merry over Christmas and the new year, they called a press conference to tell us whether Santa had indeed visited CERN this year, and left a Higgs boson in their stocking. The upshot is that although it's too early to break out the champagne, it would not be unwise to place orders for next year.

The press conference announced that both the Atlas and the CMS experiments at CERN have seen signatures of the Higgs at a mass about 125 GeV. While the statistical significance of the data exceeds 2 sigma, it has not reached the 5 sigma level at which a new particle is announced (hence the postponement of the bubbly). However it is noteworthy that the signature of the Higgs is seen in both experiments, in two different decay modes ( Higgs to two photons, and Higgs to four leptons via Z, Zbar) and at essentially the same mass. It is also important that the Higgs boson which is seen is consistent with the standard model, but is seen at a mass which does not rule out supersymmetry. Santa may break out the goodies for our supersymmetric friends, next year, after all. It will be worth the wait.

On the flip side, this will have been the slowest Eureka ever.(The top quark was like this, but every pimple on the distributions wasn't under world-wide discussion instantly, those days). On the other hand, do we really want to see 3000 physicists jump out of their bath tubs in the altogether? The Armani suits (or whatever, we're no experts) of the webcast were better. That was also the slowest webcast ever, but we won't spoil the holiday season by complaining.

Merry Christmas, everyone.

This blog post is by Neelima Gupte and Sumathi Rao.