Notes

(1) Some results have previously been reported in refs. [1,2]. Additional results and derivations are given in refs. [1,3,5,6]. A complete treatment will be given in a future publication. (See also ref. [22].)

(2) A cutoff thus implies a cutoff .

(3) is always assumed to be timelike.

(4) It is possible that high-order divergences in QCD perturbation series may be treated by a procedure analogous to renormalization. A finite number of subdiagrams whose higher-order corrections give numerically divergent series may be identified. The magnitude of each subdiagram must be determined from experiment but definite predictions are obtained for comparisons between processes involving identical subdiagrams. This procedure should be distinguished from the choice of different ``renormalization prescriptions'' for genuinely renormalized quantities.

(5) An alternative and perhaps more satisfactory procedure would be to combine a very low mass cluster with another cluster before evolving to hadrons.

(6) In fact, the assumption of quasi-two-body phase-space decays implies that even single clusters with sufficiently high masses would exhibit collinear final states.

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