Roshan Foadi et al JHEP03(2004)042 doi:10.1088/1126-6708/2004/03/042
Higgsless electroweak symmetry breaking from theory space
Roshan Foadi1, Shrihari Gopalakrishna1 and Carl Schmidt1
Show affiliationsWe investigate unitarity of W+W− scattering in the context of theory space models of the form U(1) × [SU(2)]N × SU(2)N+1, which are broken down to U(1)EM by non-linear Σ fields, without the presence of a physical Higgs Boson. By allowing the couplings of the U(1) and the final SU(2)N+1 to vary, we can fit the W and Z masses, and we find that the coefficient of the term in the amplitude that grows as E2/mW2 at high energies is suppressed by a factor of (N+1)−2. In the N+1→∞ limit the model becomes a 5-dimensional SU(2) gauge theory defined on an interval, where boundary terms at the two ends of the interval break the SU(2) down to U(1)EM. These boundary terms also modify the Kaluza-Klein (KK) mass spectrum, so that the lightest KK states can be identified as the W and Z bosons. The T parameter, which measures custodial symmetry breaking, is naturally small in these models. Depending on how matter fields are included, the strongest experimental constraints come from precision electroweak limits on the S parameter.
- Keywords
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E-print Number: hep-ph/0312324
Cited: by |
Refers: to
- PACS
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11.30.Qc Spontaneous and radiative symmetry breaking
14.80.Bn Standard-model Higgs bosons
11.30.Ly Other internal and higher symmetries
- Subjects
- Dates
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Issue 03 (March 2004)
Received 7 January 2004, accepted for publication 17 March 2004
Published 27 March 2004
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