MissingET Revertexing

Plots of the Revertexed MET, Determined by Varying the Vertex
in postscript format


T - T bar sample

  • Vertices determined by MET
    For each event, this is the vertex that corresponds to the lowest revertexed MET. Vertices were varied by tens, from -80cm. to 80cm.

  • Event vertex - new vertex (determined by MET)
    For each event, this is the event vertex minus the vertex that corresponds to the lowest revertexed MET.

  • Event vertex - new vertex (same side jets)
    For each event, this is the event vertex minus the vertex that corresponds to the lowest revertexed MET. These are the events where the leading jet and the next leading jet are on the same side of eta = 0.

  • Event vertex - new vertex (opposite side jets)
    For each event, this is the event vertex minus the vertex that corresponds to the lowest revertexed MET. These are the events where the leading jet and the next leading jet are on opposite sides of eta = 0.

  • Revertexed MET vs. vertex
    This is a scatter plot of revertexed MET vs vertex, for one event in the t-tbar sample. This plot shows a readable minimum for one vertex. The vertex that corresponds to the lowest MET is -30 cm, but the actual primary vertex is -13.6 cm.

  • Revertexed MET vs. vertex
    This is a scatter plot of revertexed MET vs vertex, for a second event in the t-tbar sample. This plot does not show a minimum. (Eight of the 12 events I looked at showed this behavior.) The vertex that corresponds to the lowest MET is -80 cm, but the actual primary vertex is -4.6 cm.

  • MET and revertexed MET
    Vertices were changed from -80 to 80, and the lowest revertexed MET for each event was selected. Those values are shown here superimposed on the actual MET spectrum.

  • MET minus revertexed MET, normalized by MET
    Vertices were changed from -80 to 80, and the lowest revertexed MET for each event was selected. Those values were normalized by the actual MET.

  • MET and revertexed MET
    Just for fun, for the vertex that minimizes revertexed MET, plotted here is revertexed MET, where ring energies were combined in pairs before the revertexing. That plot is superimposed on the actual MET.




    • QCD sample

  • Vertices determined by MET
    For each event, this is the vertex that corresponds to the lowest revertexed MET. Vertices were varied by tens, from -80cm. to 80cm.

  • Event vertex - new vertex (determined by MET)
    For each event, this is the event vertex minus the vertex that corresponds to the lowest revertexed MET.

  • Event vertex - new vertex (same side jets)
    For each event, this is the event vertex minus the vertex that corresponds to the lowest revertexed MET. These are the events where the leading jet and the next leading jet are on the same side of eta = 0.

  • Event vertex - new vertex (opposite side jets)
    For each event, this is the event vertex minus the vertex that corresponds to the lowest revertexed MET. These are the events where the leading jet and the next leading jet are on opposite sides of eta = 0.

  • Revertexed MET vs. vertex
    This is a scatter plot of revertexed MET vs vertex, for one event in the QCD sample. This plot shows a readable minimum for one vertex. The vertex that corresponds to the lowest MET is -20 cm, but the actual primary vertex is 24.0 cm.

  • Revertexed MET vs. vertex
    This is a scatter plot of revertexed MET vs vertex, for a second event in the QCD sample. This plot does not show a minimum. (Five of the 10 events I looked at showed this behavior.) The vertex that corresponds to the lowest MET is -80 cm, but the actual primary vertex is -51.9 cm.

  • MET and revertexed MET
    Vertices were changed from -80 to 80, and the lowest revertexed MET for each event was selected. Those values are shown here, with a dashed line, superimposed on the actual MET spectrum.

  • MET minus revertexed MET, normalized by MET
    Vertices were changed from -80 to 80, and the lowest revertexed MET for each event was selected. Those values were normalized by the actual MET.