Nuclear rescattering effects in massive dihadron production

We describe some implications for massive dihadron production experiments of recent observations in Fermilab experiments E609 and E557 of large nuclear rescattering effects in dijet production in hard pA collisions. Substantial upward corrections to {α} (in the A^α cross section parametrization) are indicated for dihadron experiments which detect symmetric back-to-back hadrons with narrow acceptance in azimuth or pT. Other consequences of the large nuclear rescattering are also discussed.