Fat branes,orbifolds and doublet-triplet splitting |
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| Authors: | Naoyuki Haba Nobuhito Maru |
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| Affiliation: | (1) Institute of Theoretical Physics, University of Tokushima, 770-8502 Tokushima, Japan;(2) Theoretical Physics Laboratory, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, 351-0198 Wako, Saitama, Japan |
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| Abstract: | A simple higher dimensional mechanism of the doublet-triplet splitting is presented in a five dimensional supersymmetric SU(5) GUT on S1/Z2. The splitting of multiplets is realized by a mass term of the Higgs hypermultiplet which explicitly breaks SU(5) gauge symmetry. Depending on the sign of the mass, zero mode Higgs doublets and triplets are localized on either side of the fixed points. The mass splitting is realized due to the difference of magnitudes of the overlap with a brane localized or a bulk singlet field. No unnatural fine-tuning of the parameters is needed. The proton stability is ensured by locality - without symmetries.Received: 17 September 2003, Revised: 21 November 2003, Published online: 4 February 2004Nobuhito Maru: Special Postdoctoral Researcher |
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