Where is the Higgs Hiding? March 12, 2008Posted by gordonwatts in Higgs, physics.
Yesterday, at the Moriond QCD conference, Uli Heintz gave the Tevatron Top Mass talk (pdf). New mass results have made the Higgs a little less mysterious. Summer results had a measured top mass of 171.3+-1.7 GeV and now it is 172.8 +- 1.4 GeV. This is good news for the Standard Model.
One of the beauties of the Standard Model is that it holds together so well as a theory. It predicts many different experimental measurements. And all those measurements must be in line with each other — the model cannot accommodate a measurement that is out of whack. And the better we make these measurements the better we can tell when one is out of whack.
The Higgs mass is no different. Even though we’ve not seen it yet, the Standard Model predicts its mass. With the new top mass result, the predicted mass is 87 +36-27 GeV. Using last summer’s top mass the predicted Higgs mass was 76 +33-24 GeV. Note the very large errors on those numbers – there is a lot of slop in that measurement!
This is good for the Standard Model because of work done at the LEP collider. They searched for the Higgs and didn’t see it – they know that the Higgs mass is more than 114 GeV. The summer’s prediction put the Standard Model more out of whack than the current one – the new predicted value of the top mass is more in line with the LEP Higgs search.
Still – I’d love to know where that thing is hiding (along with everyone else)! The latest Higgs results should have been released – but I’ve not seen them publicly posted yet.
N.B. That plot is the summer plot — I couldn’t find the plot with the most recent results – I found it only in Uli’s talk.