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This plot compares how a product of quantities proportional to the number of hypothetical excited q* quarks observable in the ATLAS detector through their decays into a photon and a jet (vertical axis) varies as a function of the q* mass (horizontal axis). The black dots show the 95% credibility-level (CL) upper limits on this product measured by ATLAS in 7 TeV proton collision data. The dashed line shows the upper limits that were expected. The blue line describes how a theoretical excited-quark model predicts the product to vary with q* mass. The q* mass at which the blue curve and the ATLAS observed upper limits intersect marks the 95% CL lower limit set by ATLAS on the hypothetical excited quark mass.
ATLAS Experiment © 2014 CERN