Offline Shift System - HELP

A calendar day's worth of Z's, selected via BBESEL, is used to examine beam positions and widths, vertexing and tracking.

Beam Positions

ZXFIND is used to obtain the primary vertex. (x,y,z) are histogrammed and fit with gaussians for mean and width.

Derived Quantities

K0's

ZXVEE (shortly to be replaced by BBCKDCB) is used to find the K0's. A gaussian fit is performed to get the mass and width.

Left-Right Asymmetry

The sign of polarization is used to calculate an asymmetry.

Tracking Quantities

ZXFIND defines classes of tracks:

• Inner
  • extrapolates in to all VXD3 layers
• Outer
  • hits VXD3 but not all layers
• Beyond
  • completely misses VXD3

Page Owner: Tony Johnson Updated: November 14, 2001