Instanton Induced Neutrino Majorana Masses in CFT Orientifolds with MSSM-like spectra

By Luis E Ibáñez, Bert Schellekens, A. Uranga. 2007

152 citations recorded by the source corpus.

Recently it has been shown that string instanton effects may give rise to neutrino Majorana masses in certain classes of semi-realistic string compactifications. In this paper we make a systematic search for supersymmetric MSSM-like Type II Gepner orientifold constructions admitting boundary states associated with instantons giving rise to neutrino Majorana masses and other L- and/or B-violating operators. We analyze the zero mode structure of D-brane instantons on general type II orientifold compactifications, and show that only instantons with O(1) symmetry can have just the two zero modes required to contribute to the 4d superpotential. We however discuss how the addition of fluxes and/or possible non-perturbative extensions of the orientifold compactifications would allow

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/20481c638a6ff666b79a10d9b86db39caefe7d4b

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In Nuclear and High Energy Physics

1. T. Weigand
2. Thomas W. Grimm
3. Ralph Blumenhagen
4. Eran Palti
5. M. Cvetič
6. Volker Braun
7. D. Lust
8. M. Wijnholt

Citations in the corpus

• GUTs in Type IIB Orientifold Compactifications (2008, background): “These can be either generated by higher dimensional couplings involving some additional SU(5) singlet fields or by D3-brane instantons [25, 26, 63, 64].”
• Moduli Stabilisation versus Chirality for MSSM like Type IIB Orientifolds (2007, background): “• For contributing to the superpotential, a single (isolated) instanton must wrap a four-cycle invariant under the orientifold projection and must carry an O(1) gauge symmetry [51, 52, 53].”
• Model building with $F$-theory (2008, methodology): “The rules for D-instanton calculus in type IIb backgrounds have recently been clarified [51, 52], using the concept of ‘Ganor strings’ [53], which give collective coordinates of the instanton.”
• d-Brane Instantons in Type II Orientifolds (2009, methodology): “In this case, the instanton locally feels the full N = 2 supersymmetry preserved by compactification of Type II theory on a Calabi-Yau manifold [39, 40, 41, 42].”