Before the independence day and ICHEP Higgs discovery I raised a question about the Higgs decay to WW channel. In the early days it had shown a broad excess, but this had then faded to the point where it was consistent with no Higgs anywhere rather than the signal seen in some other channels. I asked how well we could trust these results.
The deficit was especially noticeable from ATLAS with CMS showing a less significantly low event count. Today at the Higgs Hunting workshop ATLAS have released an update for their WW channel at low mass with a combination of 7 TeV and 8 TeV data. Now they once again have a broad excess signal more consistent with a boson in the low mass range. There is also a conference note giving all the details.
Using unofficial combinations I can now update the plot that shows the size of the signal in each channel. Here it is with the earlier results from 2011 shown in blue and the updated versions in green. This is a global combination with the Tevatron data helping in the bb channel.
The diphoton channel stills shows an excess while the ditau now has a deficit. Others are really in line with the standard model Higgs. In any case there is not yet enough data to draw any conclusions but that is no reason to not speculate about what might explain the results if they hold up.