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Interaction Vertex Distributions#

Vertex distributions from matched central barrel tracks#

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The left plot shows the transversal x-y distribution of the reconstructed vertices, while the right plot shows the longitudinal vertex distribution.

The mean value of the z vertes distribution usually fluctuates by +/- 0.3 cm around the central value. The mean values in the x-y directions are usually very stable.

The RM/RC must be informed immediately if:

  • the mean x and y values are outside [-0.1 cm, +0.1 cm]
  • the mean z value is outside [-1.0 cm, +1.0 cm]
  • the standard deviation in z is larger than 6.0 cm

A bookkeeping entry tagging RC should be added if the mean z value is outside [-0.5 cm, +0.5 cm].

[QC on EPN]async_QC

The RM/RC must be informed if the values are outside the limits