Technicolor theories with negative values of the Peskin-Takeuchi electroweak parameterS
نویسندگان
چکیده
منابع مشابه
Large corrections to electroweak parameters in technicolor theories
Precision electroweak measurements are presently providing a sensitive probe for new physics at and above the scale of weak interactions. It has been stressed [ 1 ] that the effects of new heavy particles which do not couple directly to light fermions are manifest almost entirely in correct ions to the vacuum polarization ampli tudes of the electroweak gauge bosons. We find that an effective la...
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We show that the pseudo Nambu–Goldstone boson contribution to the Peskin–Takeuchi electroweak parameter S can be negative in a class of technicolor theories. This negative contribution can be large enough to cancel the positive techni-hadron contribution, showing that electroweak precision tests alone cannot be used to rule out technicolor as the mechanism of electroweak symmetry breaking. PACS...
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Radiative corrections to electroweak parameters in technicolor theories may be evaluated by one of two techniques: either one estimates spectral function integrals using scaled QCD data, or one uses naive dimensional analysis with a chiral Lagrangian. The former yields corrections to electroweak parameters proportional to the number of flavors and the number of colors, while the latter is propo...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1993
ISSN: 0031-9007
DOI: 10.1103/physrevlett.70.529