x-independent uncertainties (contd.)

• luminosity

  • absolute value 10%
    • machine luminosity from accelerator parameters
    • BBC + calculation
  • absolute value 5%
    • Roman pot measurement at PP2PP
  • relative value 10-4
    • BBC - 100K counts/sec (crossing by crossing) - saturated
    • ZDC - 1K counts/sec (crossing by crossing)

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