A String model with SU(4) x O(4) x Sp(4) hidden gauge symmetry - INSPIRE

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A String model with SU(4) x O(4) x Sp(4) hidden gauge symmetry

G.K. Leontaris
(
- Ioannina U.
)

Sep, 1995

12 pages

Published in:

Phys.Lett.B 372 (1996) 212-218

e-Print:

hep-ph/9601337 [hep-ph]

DOI:

10.1016/0370-2693(96)00059-7

Report number:

IOA-335-95

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Abstract:

In the four dimensional free fermionic formulation of the heterotic string, a semi-realistic

SU(4)\times SU(2)_L \times SU(2)_R

model is proposed with three fermion generations in

(4,2,1)+(\bar 4,1,2)

representations. The gauge symmetry of the model breaks to the standard gauge group using a higgs pair in the

(4,1,2)+(\bar 4,1,2)

representations. The massless spectrum includes exotic fractionally charged states with non -- trivial transformation properties under part (

Sp(4)

) of the non -- abelian `hidden' symmetry. Finally there is a mirror pair in

(4,2,1) , (\bar 4,2,1)

allowing the possibility for an identical running of

g_{4,L,R}

couplings between the string and

SU(4)

breaking scales. This is of crucial importance for a successful prediction of the weak mixing angle. Potential shortcomings and problems of the construction are analysed and possible solutions are discussed.

Note:

LateX file, 12pp, no figures (Phys.Lett.B) Report-no: IOA-335/95

string model: heterotic
gauge field theory: SU(4) x O(4)
hidden symmetry: Sp(4)
fermion: mass
mass: fermion
group theory: representation
Higgs particle: multiplet
multiplet: Higgs particle
charge: fractional

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