  A new scalar resonance, called the radion, with couplings to fermions and
bosons similar to those of the Higgs boson, is predicted in the framework of
Randall-Sundrum models, proposed solutions to the hierarchy problem with one
extra dimension. An important distinction between the radion and the Higgs
boson is that the radion would couple directly to gluon pairs, and in
particular its decay products would include a significant fraction of gluon
jets. The radion had the same quantum numbers as the Standard Model (SM) Higgs
boson, and therefore they can mix, with the resulting mass eigenstates having
properties different from those of the SM Higgs boson. Existing searches for
the Higgs boson are sensitive to the possible production and decay of radions
and Higgs bosons in these models. For the first time, searches for the SM Higgs
boson and flavour-independent and decay-mode independent searches for a neutral
Higgs boson are used in combination to explore the parameter space of the
Randall-Sundrum model. In the dataset recorded by the OPAL experiment at LEP,
no evidence for radion or Higgs particle production was observed in any of
those searches. The results are used to set limits on the radion and Higgs
boson masses.
