All Low Energy Events Rosi Reed UC Davis March Events Events with at least 1 primary track Vx = Primary Vertex x position (cm) Vy = Primary Vertex y position (cm) Beam-Beam defined as (Vx^2+Vy^2) < 2 cm –6773 Events Beam-Pipe defined as (Vx^2 + Vy^2) > 2 cm –4150 Events

All Low Energy Events Good = Events with refMult > 158, -100<Vz<100, Vr<2 Rosi Reed UC Davis March

Z Vertex Position of all Events with at least 1 Primary Track

Z Vertex Position of all Events with at least 1 Primary Track and (Vx^2 + Vy^2) < 2 cm

Z Vertex Position of all Events with at least 1 Primary Track and (Vx^2 + Vy^2) > 2 cm

XY Vertex Position of all Events with at least 1 Primary Track