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Uses and abuses of effective Lagrangians

C.P. Burgess
(
- McGill U.
)
,
David London
(
- Montreal U.
)

Mar, 1992

32 pages

Published in:

Phys.Rev.D 48 (1993) 4337-4351

e-Print:

hep-ph/9203216 [hep-ph]

DOI:

10.1103/PhysRevD.48.4337

Report number:

MCGILL-92-05,
UDEM-LPN-TH-84

View in:

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Abstract:

Motivated by past and recent analyses we critically re-examine the use of effective lagrangians in the literature to constrain new physics and to determine the `physics reach' of future experiments. We demonstrate that most calculations, such as those involving anomalous trilinear gauge-boson couplings (TGV's), considerably overestimate loop-induced effects. In contrast to previous critics of these loop estimates, we argue that the gauge invariance of the low-energy lagrangian is irrelevant to this conclusion. We also show that the implications of custodial symmetry for TGV's are weaker than has been claimed in the literature.

effective Lagrangian
coupling: (3gauge boson)
(3gauge boson): coupling
electroweak interaction: rho parameter
rho parameter: electroweak interaction
renormalization
CP: violation
coupling: (Z0 tau)
(Z0 tau): coupling
symmetry: SU(2)

References(94)

Figures(0)

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