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Discrete gauge symmetries in D-brane models

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Abstract

In particle physics model building discrete symmetries are often invoked to forbid unwanted or dangerous couplings. A classical example is the R-parity of the MSSM, which guarantees the absence of dimension four baryon- and lepton-number violating operators. Although phenomenologically useful, these discrete symmetries are, in the context of field theory, poorly motivated at a more fundamental level. Moreover, discrete global symmetries are expected to be violated in consistent couplings to quantum gravity, while their gauged versions are expected to actually exist. In this paper we study discrete gauge symmetries in brane models in string theory, and argue that they are fairly generic in this framework. In particular we study the appearance of discrete gauge symmetries in (MS)SM brane constructions in string theory, and show that a few discrete Z N gauge symmetries, including R-parity and baryon triality, appear naturally as remnants of continuous U(1) gauge symmetries with Stückelberg N (B ∧ F ) couplings. Interestingly, they correspond to the simplest anomaly-free discrete symmetries of the MSSM as classified in the early 90’s. We provide a number of examples based on type IIA intersecting brane constructions with a (MS)SM spectrum. We also study the appearance of discrete generalizations of R-parity in unified SU(5) type IIA orientifolds and local F-theory SU(5) GUTs.

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  1. Departamento de Física Teórica, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain

    Mikel Berasaluce-González, Luis E. Ibáñez & Pablo Soler

  2. Instituto de Física Teórica IFT-UAM/CSIC, Universidad Autónoma de Madrid, C/ Nicolás Cabrera 13-15, 28049, Madrid, Spain

    Mikel Berasaluce-González, Luis E. Ibáñez, Pablo Soler & Angel M. Uranga

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  1. Mikel Berasaluce-González
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Berasaluce-González, M., Ibáñez, L.E., Soler, P. et al. Discrete gauge symmetries in D-brane models. J. High Energ. Phys. 2011, 113 (2011). https://doi.org/10.1007/JHEP12(2011)113

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