Higgs-matter splitting in quasi-realistic orbifold string GUTs

Author: Faraggi, A.E.

Source: The European Physical Journal C - Particles and Fields, Volume 49, Number 3, February 2007 , pp. 803-813(11)

Publisher: Springer

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Abstract:

E₆ grand unification combines the standard model matter and Higgs states in the single 27 representation. I discuss how the E₆ structure underlies the quasi-realistic free fermion heterotic-string models. E₆→SO(10)×U(1) breaking is obtained by a GSO phase in the N=1 partition function. The equivalence of this symmetry breaking phase with a particular choice of boundary condition basis vectors, which is used in the quasi-realistic models, is demonstrated in several cases. As a result, matter states in the spinorial 16 representation of SO(10) arise from the twisted sectors, whereas the Higgs states arise from the untwisted sector. Possible additional phenomenological implications of this E₆ symmetry breaking pattern are discussed.

Document Type: Research article

DOI: http://dx.doi.org/10.1140/epjc/s10052-006-0160-z

Affiliations: 1: Email: faraggi@sune.amtp.liv.ac.uk

Publication date: 2007-02-01