The invariant mass distributions for $\rm \Lambda$ (top), $\rm \Xi$ (middle) and $\rm \Omega$ (bottom) in pp at $\sqrt{s} = 7$ TeV. Areas considered as signal and background (green) or pure background (blue) are shown. The lines corresponds to a polynomial fit to the background areas. | ![](https://alice-publications.web.cern.ch/sites/default/files/papers/594/figureMassLambda-4100.png ) |