  We calculate the 2-triplon contribution to the dynamic structure factor of
the 2-dimensional Shastry-Sutherland model, realized in SrCu2(BO3)2, by means
of perturbative continuous unitary transformations. For realistic parameters we
find flat bound 2-triplon bands. These bands show large weight in the structure
factor depending strongly on momentum. So our findings permit a quantitative
understanding of high precision inelastic neutron scattering experiments.
