Computation of D-brane instanton induced superpotential couplings - Majorana masses from string theory

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dc.creatorCvetic, Mirjam
dc.creatorRichter, Robert
dc.creatorWeigand, Timo
dc.date2007-03-03
dc.date2007-05-16
dc.date.accessioned2026-07-07T11:59:42Z
dc.date.available2026-07-07T11:59:42Z
dc.descriptionWe perform a detailed conformal field theory analysis of D2-brane instanton effects in four-dimensional type IIA string vacua with intersecting D6-branes. In particular, we explicitly compute instanton induced fermion two-point couplings which play the role of perturbatively forbidden Majorana mass terms for right-handed neutrinos or MSSM mu-terms. These results can readily be extended to higher-dimensional operators. In concrete realizations of such non-perturbative effects, the Euclidean D2-brane has to wrap a rigid, supersymmetric cycle with strong constraints on the zero mode structure. Their implications for Type IIA compactifications on the T^6/(Z_2 x Z_2) orientifold with discrete torsion are analyzed. We also construct a local supersymmetric GUT-like model allowing for a class of Euclidean D2-branes whose fermionic zero modes meet all the constraints for generating Majorana masses in the phenomenologically allowed regime. Together with perturbatively realized Dirac masses, these non-perturbative couplings give rise to the see-saw mechanism.
dc.description33 pages, 4 figures; v2: minor corrections and clarifications added
dc.identifierhttps://arxiv.org/abs/hep-th/0703028
dc.identifierhttp://arxiv.org/abs/hep-th/0703028
dc.identifierPhys.Rev.D76:086002,2007
dc.identifierdoi:10.1103/PhysRevD.76.086002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206655
dc.subjectHigh Energy Physics - Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.titleComputation of D-brane instanton induced superpotential couplings - Majorana masses from string theory
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