Posted: Dec 18, 2012 4:24 pm
by lpetrich
This discrepancy could be due to the vagaries of statistics or due to unmodeled or incorrectly-modeled systematic effects.

But that blog entry reports on another result: the putative Higgs particle's spin. It's consistent with zero to within experimental limits. A common benchmark spin-2 model was ruled out to a confidence limit of 90%.


The first LHC protons run ends with new milestone | CERN press office
Geneva, 17 December 2012. This morning CERN completed the first LHC proton run. The remarkable first three-year run of the world’s most powerful particle accelerator was crowned by a new performance milestone. The space between proton bunches in the beams was halved to further increase beam intensity. ...

To put this into context, of the 6 million billion proton-proton collisions generated by the LHC, the ATLAS and CMS experiments have each recorded around 5 billion collisions of interest over the last three years. Of these, only around 400 produced results compatible with the Higgs-like particle whose discovery was announced in July. ...

At the beginning of 2013, the LHC will collide protons with lead ions before going into a long maintenance stop until the end of 2014. Running will resume in 2015 with increased collision energy of 13 TeV and another increase in luminosity.