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We consider a 5-dimensional SU(5) model wherein the symmetry is broken to the4-dimensional Standard Model by compactification of the 5th dimension on anS^1/(Z_2 \times Z^\prime_2) orbifold. We identify the members of all SU(5)representations upto 75 which have zero modes. We examine how these lightscalars affect gauge coupling unification assuming a single intermediate scaleand present several acceptable solutions. The 5-D compactification scalecoincides with the unification scale of gauge couplings and is determined viathis renormalization group analysis. When SO(10) is considered as the GUT groupthere are only two solutions, so long as a few low dimensional scalarmultiplets upto 126 are included.Comment: Latex, 1 eps figur

Gauge unification in 5DSU(5) model with orbifold breaking of GUT symmetry