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E6 models from F-theory

E6 models from F-theory
E6 models from F-theory
F-theory is a non-perturbative formulation of type IIB superstring theory which allows for the decoupling of gravity and for the formulation of GUT theories based on the gauge group E 6. In this paper we explore F-theory models in which the low energy supersymmetric theory contains the particle content of three 27 dimensional representations of the underlying E 6 gauge group, plus two extra right-handed neutrinos predicted from F and D flatness. The resulting TeV scale effective theory resembles either the E6SSM or the NMSSM+, depending on whether an additional Abelian gauge group does or does not survive. However there are novel features compared to both these models as follows: (i) If the additional Abelian gauge group is unbroken then it can have a weaker gauge coupling than in the E6SSM; (ii) If the additional Abelian gauge group is broken then non-perturbative effects can violate the scale invariance of the NMSSM+ leading to a generalised model; (iii) Unification is achieved not at the field theory level but at the F-theory level since the gauge couplings are split by flux effects, negating the need for any additional doublet states which are usually required; (iv) Proton decay is suppressed by the geometric coupling suppression of a singlet state, a mechanism peculiar to F-theory, which effectively suppresses the coupling of the exotic charge ?1/3 colour triplet state D to quarks and leptons; (v) The D¯¯¯ decays as a chiral leptoquark with couplings to left-handed quarks and leptons, providing characteristic and striking signatures at the LHC.
Callaghan, James C.
a0c89c0a-eb42-4c7b-8c8c-7680e8b75a22
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
Callaghan, James C.
a0c89c0a-eb42-4c7b-8c8c-7680e8b75a22
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538

Callaghan, James C. and King, Stephen F. (2013) E6 models from F-theory. The Journal of High Energy Physics, 2013. (doi:10.1007/JHEP04(2013)034).

Record type: Article

Abstract

F-theory is a non-perturbative formulation of type IIB superstring theory which allows for the decoupling of gravity and for the formulation of GUT theories based on the gauge group E 6. In this paper we explore F-theory models in which the low energy supersymmetric theory contains the particle content of three 27 dimensional representations of the underlying E 6 gauge group, plus two extra right-handed neutrinos predicted from F and D flatness. The resulting TeV scale effective theory resembles either the E6SSM or the NMSSM+, depending on whether an additional Abelian gauge group does or does not survive. However there are novel features compared to both these models as follows: (i) If the additional Abelian gauge group is unbroken then it can have a weaker gauge coupling than in the E6SSM; (ii) If the additional Abelian gauge group is broken then non-perturbative effects can violate the scale invariance of the NMSSM+ leading to a generalised model; (iii) Unification is achieved not at the field theory level but at the F-theory level since the gauge couplings are split by flux effects, negating the need for any additional doublet states which are usually required; (iv) Proton decay is suppressed by the geometric coupling suppression of a singlet state, a mechanism peculiar to F-theory, which effectively suppresses the coupling of the exotic charge ?1/3 colour triplet state D to quarks and leptons; (v) The D¯¯¯ decays as a chiral leptoquark with couplings to left-handed quarks and leptons, providing characteristic and striking signatures at the LHC.

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More information

Published date: 5 April 2013
Additional Information: Open access, CC BY 4.0
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 369320
URI: http://eprints.soton.ac.uk/id/eprint/369320
PURE UUID: 01c8aeab-7259-4ba7-bf91-121d004d7c9b

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Date deposited: 23 Sep 2014 13:25
Last modified: 15 Jul 2019 21:43

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