  The searches for H -> WW events at the LHC use data driven techniques for
estimating the q qbar -> WW background, by normalizing the background cross
section to data in a control region. We investigate the possibility that new
physics sources which mainly contribute to the control region lead to an
overestimate of Standard Model backgrounds to the Higgs boson signal and, thus,
to an underestimate of the H -> WW signal. A supersymmetric scenario with heavy
squarks and gluinos but charginos in the 200 to 300 GeV region and somewhat
lighter sleptons can lead to such a situation.
