Deformed Intersecting D6-Brane GUTS II

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dc.creatorKokorelis, Christos
dc.date2002-10-21
dc.date.accessioned2026-07-07T04:14:21Z
dc.date.available2026-07-07T04:14:21Z
dc.descriptionBy employing D6-branes intersecting at angles in $D = 4$ type I strings, we construct {\em five stack} string GUT models (PS-II class), that contain at low energy {\em exactly the Standard model} with no extra matter and/or extra gauge group factors. These classes of models are based on the Pati-Salam (PS) gauge group $SU(4)_C \times SU(2)_L \times SU(2)_R$. They represent deformations around the quark and lepton basic intersection number structure. The models possess the same phenomenological characteristics of some recently discussed examples (PS-A and PS-I class) of four stack PS GUTS. Namely, there are no colour triplet couplings to mediate proton decay and proton is stable as baryon number is a gauged symmetry. Neutrinos get masses of the correct sizes. Also the mass relation $m_e = m_d$ at the GUT scale is recovered. The conditions for the non-anomalous U(1)'s to survive massless the Green-Schwarz mechanism are equivalent, to the conditions, coming from the presence of N=1 supersymmetry, in sectors involving the presence of {\em extra} branes and also required to guarantee the existence of the Majorana mass term for the right handed neutrinos. These conditions are independent from the number of {\em extra} U(1) branes. We also discuss the relative size of the leading worldsheet instanton correction to the trilinear Yukawa couplings in a general GUT model.
dc.description46 pages, 2 figures, LaTex
dc.identifierhttps://arxiv.org/abs/hep-th/0210200
dc.identifierhttp://arxiv.org/abs/hep-th/0210200
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/51593
dc.subjectHigh Energy Physics - Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.titleDeformed Intersecting D6-Brane GUTS II
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