  Fiducial production cross sections measurements of Standard Model processes,
in principle, provide constraints on new physics scenarios via a comparison of
the predicted Standard Model cross section and the observed cross section. This
approach received significant attention in recent years, both from direct
constraints on specific models and the interpretation of measurements in the
view of effective field theories. A generic problem in the reinterpretations of
Standard Model measurements is the corrections applied to data to account for
detector effects. These corrections inherently assume the Standard Model to be
valid, thus implying a model bias of the final result. In this work, we study
the size of this bias by studying several new physics models and fiducial
phase-space regions. The studies are based on fast detector simulations of a
generic multi-purpose detector at the Large Hadron Collider. We conclude that
the model bias in the associated reinterpretations is negligible only in
specific cases. An evaluation of potential migration effects, as well as a
precise definition of the final state signatures, has to be performed before
any new physics reinterpretation effort.
