# What's the Standard Model width of a 125 GeV Higgs?

There's a fairly broad mass spread in the new results out of Atlas and CMS. I'm curious how this fits with the expected SM width.

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Tiny, << 1 GeV. The only significant modes are b-bbar and tau-taubar and both are relatively light. Found the answer and references here: math.columbia.edu/~woit/wordpress/… The observed width and uncertainty is all from the detectors. – Foster Boondoggle Dec 13 '11 at 17:15
nice find, perhaps you could post that as an answer. – David Zaslavsky Dec 13 '11 at 17:47

The 125 Higgs decays to (virtual or real) $b\bar b$ (messy final state, a bit hard to isolate from the background) in 65% of cases, $WW$ (neutrinos from the decayed $W$ are missing energy) in 20%, $gg$ (messy) in 7% of cases, $\tau\tau$ in 6% of cases, $ZZ$ in 3% of cases, $c\bar c$ in 2% of cases, $\gamma\gamma$ in 0.2%, $\gamma Z$ in 0.15% of cases. The numbers were estimated by looking at the graph above so they don't quite add to 100 percent, sorry.