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The spectrum of the b states: the leftmost peak is the b(1P), the middle one the b(2P), and the rightmost the new b(3P). The upper plot shows the spectrum for decays involving unconverted photons, while th lower plot shows the spectra for decays involving converted photons. In the lower plot, the upper (red) curve shows the spectrum for b decays to (1S), while the lower (brown) curve shows the spectrum for decays to (2S). (Only the b(3P) peak appears distinctly in the lower spectrum because it is the only b state with decays involving enough energy to be detected in this study.)
ATLAS Experiment © 2011 CERN