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Electroweak corrections and unitarity in linear moose models

R. Sekhar Chivukula^* and Elizabeth H. Simmons^†

Hong-Jian He^‡

Masafumi Kurachi^§

Masaharu Tanabashi^∥

Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA

Department of Physics, University of Texas, Austin, Texas 78712, USA

Department of Physics, Nagoya University, Nagoya 464-8602, Japan

Department of Physics, Tohoku University, Sendai 980-8578, Japan

^*Electronic address: sekhar@msu.edu
^†Electronic address: esimmons@msu.edu
^‡Electronic address: hjhe@physics.utexas.edu
^§Electronic address: kurachi@eken.phys.nagoya-u.ac.jp
^∥Electronic address: tanabash@tuhep.phys.tohoku.ac.jp

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Phys. Rev. D 71, 035007 – Published 10 February, 2005

DOI: https://doi.org/10.1103/PhysRevD.71.035007

Abstract

We calculate the form of the corrections to the electroweak interactions in the class of Higgsless models which can be deconstructed to a chain of $S U (2)$ gauge groups adjacent to a chain of $U (1)$ gauge groups, and with the fermions coupled to any single $S U (2)$ group and to any single $U (1)$ group along the chain. The primary advantage of our technique is that the size of corrections to electroweak processes can be directly related to the spectrum of vector bosons (“KK modes”). In Higgsless models, this spectrum is constrained by unitarity. Our methods also allow for arbitrary background 5D geometry, spatially dependent gauge-couplings, and brane kinetic energy terms. We find that, due to the size of corrections to electroweak processes in any unitary theory, Higgsless models with localized fermions are disfavored by precision electroweak data. Although we stress our results as they apply to continuum Higgsless 5D models, they apply to any linear moose model including those with only a few extra vector bosons. Our calculations of electroweak corrections also apply directly to the electroweak gauge sector of 5D theories with a bulk scalar Higgs boson; the constraints arising from unitarity do not apply in this case.

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Electroweak corrections and unitarity in linear moose models

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