Number of Primary Vertices 78.9% of events had 1 primary vertex –81.6% of “beam-beam” events have 1 primary vertex –71.6% of “beam-pipe” events have 1.

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Number of Primary Vertices 78.9% of events had 1 primary vertex –81.6% of “beam-beam” events have 1 primary vertex –71.6% of “beam-pipe” events have 1 primary vertex (Data taken from runs 97,76,72) Rosi Reed UC Davis April 2, 2008

Number of primary vertices Run 97, 76, 72

Number of primary vertices “Beam-Beam” events Run 97, 76, 72

Number of primary vertices “Beam-Pipe” events Run 97, 76, 72

xy Location of Second Vertex for Events with Vertex 1 r > 2 cm Run 97, 76, 72

xy Location of Third Vertex for Events with Vertex 1 r > 2 cm Run 97, 76, 72

Average Eta per Event for Events with Vertex 1 r < 2 cm Run 97, 76, 72 Eta averaged over primary tracks only

Average Eta per Event for Events with Vertex 1 r > 2 cm and |Vz| < 75 cm Run 97, 76, 72 Eta averaged over primary tracks only

Average Eta per Event for Events with Vertex 1 r > 2 cm and |Vz| < 75 cm Run 97, 76, 72 Eta averaged over primary tracks only