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Intermediate vector boson selfenergies from a strong electroweak sector

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DOI: 10.1016/0370-2693(91)91225-K
OAI: oai:inspirehep.net:305482
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INSPIRE-HEP
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Abstract

We calculate the self-energies of the intermediate vector bosons from an effective lagrangian describing possible strongly interacting vector and axial-vector bosons, deduced on the basis of electromagnetic gauge invariance and SU (2) custodial symmetry. Comparison with the standard low-energy parametrization of such self-energies suggests an isospin conserving contribution, called S according to the usual notation, which in principle could also take a negative value, within the permitted range of the model parameters. Technifermion loops in technicolor theories give positive S . Atomic parity experiments indicate a negative central value for S but are affected by large errors and one has to wait for future more accurate determinations.

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