Unitarity in Higher Dimensions and Gauge Unification

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dc.creatorChivukula, R. Sekhar
dc.creatorDicus, Duane A.
dc.creatorHe, Hong-Jian
dc.creatorNandi, S.
dc.date2004-02-21
dc.date.accessioned2026-07-07T03:52:08Z
dc.date.available2026-07-07T03:52:08Z
dc.descriptionUnitarity of the 4d standard model is ensured by the conventional Higgs mechanism with a fundamental spin-0 Higgs boson, responsible for gauge boson mass-generations. On the contrary Kaluza-Klein (KK) compactification of extra spatial dimensions can geometrically realize the gauge boson mass generation without invoking a fundamental Higgs scalar. We reveal that massive gauge boson scattering in the compactified theories is unitary at low energies, and the unitarity violation is {\it delayed} to the intrinsic ultraviolet (UV) scale of the higher dimensional gauge theory. We demonstrate that this is a generic consequence of the ``geometric Higgs mechanism'' (GHM), manifested via Kaluza-Klein equivalence theorem (KK-ET). We further show that the presence of many gauge KK states below the UV cutoff scale imposes strong bounds on the highest KK level (N_KK). Applying these bounds to higher-dimensional SUSY GUTs implies that only a small number of KK states can be used to accelerate gauge coupling unification, and suggests that the GUT scale in the 5d minimal SUSY SU(5) is above 10^{14} GeV.
dc.descriptionTalk presented by H.J.H. at SUSY 2003: Supersymmetry in the Desert, held at the University of Arizona,Tucson, AZ, USA, June 5-10, 2003. To appear in the Proceedings
dc.identifierhttps://arxiv.org/abs/hep-ph/0402222
dc.identifierhttp://arxiv.org/abs/hep-ph/0402222
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/43350
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.subjectHigh Energy Physics - Theory
dc.titleUnitarity in Higher Dimensions and Gauge Unification
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