Fig. 29.

Map of the values of the likelihood ratio $q(x,\mathrm{\Delta }m)$ for two near mass-degenerate states parameterized by $x$ (the fraction of signal in the lower mass state) and $\mathrm{\Delta }m$ (the mass difference between the states). The black cross shows the best-fit value, and the lines correspond to the $1\mathit{\sigma }$ and $2\mathit{\sigma }$ uncertainty contours for the SM (single state) expectation (upper plot) and the observation (lower plot)