The dual gauge fixing property of the S matrix


The SS-matrix is known to be independent of the gauge fixing parameter to all orders in perturbation theory. In this paper by employing the pinch technique we prove at one loop a stronger version of this independence. In particular we show that one can use a gauge fixing parameter for the gauge bosons inside quantum loops which is different from that used for the bosons outside loops, and the SS-matrix is independent from both. Possible phenomenological applications of this result are briefly discussed.Comment: 17 pages, Late

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