ANALYSIS OF POSITRON-HYDROGEN COLLISIONS USING EFFECTIVE RANGE THEORIES S. J. Ward$^{+,*}$ and J. H. Macek$^\dagger$ $^+$ Department of Physics, University of North Texas, Denton, Texas 76203, USA * Present Address ITAMP $^\dagger$ Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA and Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA We have used two different effective range theories to analyze variational results for positron-hydrogen collisions in the Ore gap. The effective range theories explicitly include the polarization potential in the positronium-proton channel.