Broken Symmetries

have large errors, are in complete agreement with the physical-region plots obtained by other authors" as well as our own I Fig. 7(a)j. The results given here support the general validity of the Chew-Low technique. They illustrate the strong statistical requirements to which a meaningful application of this technique is subjected; they also show that pole effects seen in the physical region are confirmed by extrapolation, as required. The reverse, however, is not necessarily true: pole contributions obtained correctly through extrapolations can be washed out in the physical region by contributions other than those of poles. Extrapolation results are therefore to be used in parallel with physical-region plots. Physical-region plots, which require less statistics than do extrapolations in order to be meaningful, are more useful therefore in detecting the location, width, etc. of the eventual resonance. Extrapolation results then give additional weight to these conclusions and provide the ultimate proof that the production process was indeed a peripheral one.