Pole-Extrapolation Results frompp→Δ++nat 6.6 GeV/c

We present an experimental study of the low-momentum-transfer ${\Delta }^{++}n$ component of 6424 $\mathrm{pp}\to p{\pi }^{+}n$ events at 6.6 GeV/c. The ${\pi }^{+}p$ elastic cross sections in the ${\Delta }^{++}$ region are measured by means of several different pole-extrapolation procedures. We find that the conventional Chew-Low extrapolation procedure yields results not in satisfactory agreement with the known on-shell cross sections. We suggest a modified extrapolation procedure which in our case yields results in good agreement with the on-shell values.