English: The distribution of ππ masses for decays consistent with the B-meson. On the left, the distribution without RICH particle identification (every particle assumed to be π); on the right, with kaons rejected by RICH identification.
Deutsch: Verteilung der invarianten Masse zweier Pionen für mögliche Zerfälle von B-Mesonen. Links die Verteilung ohne RICH-Information (jedes Teilchen wird als Pion behandelt), rechts nachdem vom RICH identifizierte Kaonen entfernt wurden.
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