High Energy Physics - Phenomenology
[Submitted on 27 Feb 2003
(v1)
, last revised 2 Apr 2003 (this version, v2)]
Title: Unitarity of the Higher Dimensional Standard Model
Title: 高维标准模型的幺正性
Abstract: We study the unitarity of the standard model (SM) in higher dimensions. We show that the essential features of SM unitarity remain after compactification, and place bounds on the highest Kaluza-Klein (KK) level N_KK and the Higgs mass m_H in the effective four-dimensional (4d) low-energy theory. We demonstrate these general observations by explicitly analyzing the effective 4d KK theory of a compactified 5d SM on S^1/Z_2. The nontrivial energy cancellations in the scattering of longitudinal KK gluons or KK weak bosons, a consequence of the geometric Higgs mechanism, are verified. In the case of the electroweak gauge bosons, the longitudinal KK states also include a small mixture from the KK Higgs excitations. With the analyses before and after compactification, we derive the strongest bounds on N_KK from gauge KK scattering. 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. As a consequence, we show that the GUT scale in the 5d minimal SUSY GUT cannot be lower than about 10^{14} GeV.
Submission history
From: Hong-Jian He [view email][v1] Thu, 27 Feb 2003 20:12:31 UTC (22 KB)
[v2] Wed, 2 Apr 2003 06:47:41 UTC (23 KB)
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