So What Is It???

So what is it? Matt Strassler on “the bump seen on the ATLAS and CMS two-photon plot” at the LHC

Of Particular Significance

So What Is It? That’s the question one hears in all the bars and on all the street corners and on every Twitter feed and in the whispering of the wind. Everybody wants to know.That bump seen on the ATLAS and CMS two-photon plots! What… IS… it…?

ATLAS_CMS_diphoton_2015 The two-photon results from ATLAS (top) and CMS (bottom) aligned, so that the 600, 700 and 800 GeV locations (blue vertical lines) line up almost perfectly. The peaks in the two data sets are in about the same location. ATLAS’s is larger and also wider. Click here for more commentary.

Well, to be honest, probably it’s just that: a bump on a plot. But just in case it’s not — just in case it really is the sign of a new particle in Large Hadron Collider [LHC] data — let me (start to) address the question.

First: what it isn’t. It…

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