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ATLAS Experiment CERN

 

The upper part of this plot shows a histogram (black dots) of ATLAS data events containing a photon and a jet, organized into bins defined by the mass of the photon-plus-jet pair. The stepped solid line represents a mathematical background function that has been fitted to the ATLAS data. If an exotic particle, having a mass in this range and decaying to a photon and a jet, were produced in the LHC, we would expect a bump to appear in the ATLAS data. Depending on the mass of the new particle and how readily it is created in the LHC, the bump could resemble one of the three indicated coloured peaks representing hypothetical excited quarks (q*) having masses of 0.5, 1.0, and 2.0 TeV. The lower part of this plot shows the statistical significance of the difference between the ATLAS data and the background function in each bin.
ATLAS Experiment © 2016 CERN