The invariant $K^+K^-\pi^+$ mass spectra for events associated with a muon for the 3 pb$^{-1}$ sample in the pseudorapidity interval $2<\eta<6$ for RS combinations (a) and WS combinations (c). Also shown is the natural logarithm of the IP distributions of the $D_s^+$ candidates for (b) RS and (d) WS $D^+_s$ muon candidate combinations. The labelling of the curves is the same on all four sub-figures. In descending order in (a): green-solid curve shows the total, the blue-dashed curve the Dfb signal, the black-dotted curve the sideband background, the purple-dot-dashed the misinterpreted $\Lambda_c^+\to pK^-\pi^+$ contribution, the black dash-dash-dot curve the $D^{*+}\to \pi^+D^0\to K^+K^-\pi^+$ contribution, and the barely visible red-solid curves the Prompt yield. The Dfb signal, the $\Lambda_c^+$ reflection and $D^{*+}$ signal are too small to be seen in the WS distributions. The insert in (b) shows an expanded view of the region populated by Prompt charm production.

The mass difference $m(K^-\pi^+K^+)-m(K^-\pi^+)$ added to the known $D^0$ mass for events with $K^-\pi^+$ invariant masses within $\pm$20 MeV of the $D^0$ mass (black points) in semileptonic decays. The histogram shows wrong-sign events with an additional $K^-$ instead of a $K^+$. The curves are described in the text. (a) For the 3 pb$^{-1}$ data sample and (b) for the 20 pb$^{-1}$ sample.

Animated gif made out of all figures.