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The method used in this analysis to evaluate the uncertainties due to
the systematic effects is the same as described in [6].
For more details on the systematic studies used here refer to [1].
Just to remind how the systematics checks are considered,
let be the value obtained with the (nominal) systematic
hypothesis . The corrected can be expressed as a function of
and of a shift due to the systematic effect .

(8) 
The best value of and its variance is,
using a Taylor's expansion at the first order:
The contributions given by each systematic source
are reported in the table 1.
From the table 1 we get:

(11) 
that means

(12) 
Next: Comparison to the theory
Up: The extraction of the
Previous: The cross section value
Giulio D'Agostini
20040505