Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1999-01-21
Adv.Theor.Math.Phys. 3 (2000) 3; Adv.Theor.Math.Phys. 3 (1999) 627-670
Physics
High Energy Physics
High Energy Physics - Theory
35p, LaTeX, using epsf for four figures. References updated and typos corrected
Scientific paper
The recently discovered formalism underlying renormalization theory, the Hopf algebra of rooted trees, allows to generalize Chen's lemma. In its generalized form it describes the change of a scale in Green functions, and hence relates to the operator product expansion. Hand in hand with this generalization goes the generalization of the ordinary factorial $n!$ to the tree factorial $t^!$. Various identities on tree-factorials are derived which clarify the relation between Connes-Moscovici weights and Quantum Field Theory.
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