Conformal Transformations of S-Matrix in Scalar Field Theory

Details Conformal Transformations of S-Matrix in Scalar Field Theory Conformal Transformations of S-Matrix in Scalar Field Theory

2003-05-26

arxiv.org/abs/hep-th/0305223v3

Eur.Phys.J.C31:103-122,2003

Physics

High Energy Physics

High Energy Physics - Theory

v1: 37 pages with revtex4; 4 figures, one using the feynmf package, others using the axodraw package. v2: the first version, e

Scientific paper

10.1140/epjc/s2003-01317-y

In this paper, three methods for describing the conformal transformations of the S-matrix in quantum field theory are proposed. They are illustrated by applying the algebraic renormalization procedure to the quantum scalar field theory, defined by the LSZ reduction mechanism in the BPHZ renormalization scheme. Central results are shown to be independent of scheme choices and derived to all orders in loop expansions. Firstly, the local Callan-Symanzik equation is constructed, in which the insertion of the trace of the energy-momentum tensor is related to the beta function and the anomalous dimension. With this result, the Ward identities for the conformal transformations of the Green functions are derived. Then the conformal transformations of the S-matrix defined by the LSZ reduction procedure are calculated. Secondly, the conformal transformations of the S-matrix in the functional formalism are related to charge constructions. The commutators between the charges and the S-matrix operator are written in a compact way to represent the conformal transformations of the S-matrix. Lastly, the massive scalar field theory with local coupling is introduced in order to control breaking of the conformal invariance further. The conformal transformations of the S-matrix with local coupling are calculated.

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