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Of Particular Significance

Is This the Beginning of the End of the Standard Model?

16 Dec 2015, 13:00 UTC
Is This the Beginning of the End of the Standard Model?
(200 words excerpt, click title or image to see full post)

Was yesterday the day when a crack appeared in the Standard Model that will lead to its demise? Maybe. It was a very interesting day, that’s for sure. [Here’s yesterday’s article on the results as they appeared.]
I find the following plot useful… it shows the results on photon pairs from ATLAS and CMS superposed for comparison. [I take only the central events from CMS because the events that have a photon in the endcap don’t show much (there are excesses and deficits in the interesting region) and because it makes the plot too cluttered; suffice it to say that the endcap photons show nothing unusual.] The challenge is that ATLAS uses a linear horizontal axis while CMS uses a logarithmic one, but in the interesting region of 600-800 GeV you can more or less line them up. Notice that CMS’s bins are narrower than ATLAS’s by a factor of 2.
The diphoton results from ATLAS (top) and CMS (bottom) arranged so that the 600, 700 and 800 GeV locations (blue vertical lines) line up almost perfectly. (The plots do not line up away from this region!) The data are the black dots (ignore the bottom section of CMS’s plot ...

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