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From the write-up of my note describing the analysis of
the '95 Shifted Vertex Data [1] to the publication of the
results by the collaboration I have had several interactions with the author
of the other parallel analysis, as well as with other ZEUS colleagues, in order
to cross-check methods and results. Since several aspects
of my analysis are not standard I would like to give in this note the final numbers
on obtainable from those data with this method, on the light
of the increased confidence of the data and on the method (and also
after that some mistake has been corrected ...).
The analysis strategy is described in detail
in [1], and it is sketched here very shortly:
from the observed number of events we infer
the (``true'') number of events to be attributed to each and cell.
These values are then corrected
for the radiative contribution, obtaining the born cross
section for each bin. The values are calculated in the
centre of the bin, using a Taylor's expansion up to the second order,
to take into account the non constant behaviour
of the cross section in the bin.
Finally the uncertainties due to systematic effects are evaluated in a
probabilistic way, also taking into account the correlations they
introduce on the data points.

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Giulio D'Agostini
2004-05-05