Dependence of the S-matrix on the choice of field variables in the effective Lagrangian |
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Authors: | J Novotný |
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Institution: | (1) Faculty of Mathematics and Physics Charles University, Nuclear Centre, V Holeovikách 2, 180 00 Praha 8, Czechoslovakia |
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Abstract: | The dependence of the on-shellS-matrix on the change of the Lagrangian induced by a nonlinear substitutionF() is investigated by means of a graphical analysis. A cancellation mechanism is found and used to show that the tree approximation of theS-matrix is independent of such a substitution and that the Jacobian of the substitution has to be introduced in order to cancel a new class of singular one-loop graphs and to recover the primaryS-matrix at the one-loop level. |
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