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T-branes and Yukawa couplings

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Abstract

We consider various configurations of T-branes which are non-abelian bound states of branes and were recently introduced by Cecotti, Cordova, Heckman and Vafa. They are a refinement of the concept of monodromic branes featured in phenomenological F-theory models. We are particularly interested in the T-branes corresponding to Z 3 and Z 4 monodromies, which are used to break E 7 or E 8 gauge groups to SU(5) GUT . Our results imply that the up-type and down-type Yukawa couplings for the breaking of E 7 are zero, whereas up-type and down-type Yukawa couplings, together with right handed neutrino Yukawas are non-zero for the case of the breaking of E 8. The dimension four proton decay mediating term is avoided in models with either E 7 or E 8 breaking.

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Authors and Affiliations

  1. Division of Theoretical Physics, Department of Mathematical Sciences, The University of Liverpool, Liverpool, U.K.

    Chan-Chi Chiou, Alon E. Faraggi, Radu Tatar & William Walters

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  1. Chan-Chi Chiou
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  2. Alon E. Faraggi
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  3. Radu Tatar
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  4. William Walters
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Correspondence to William Walters.

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ArXiv ePrint: 1101.2455

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Chiou, CC., Faraggi, A.E., Tatar, R. et al. T-branes and Yukawa couplings. J. High Energ. Phys. 2011, 23 (2011). https://doi.org/10.1007/JHEP05(2011)023

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  • DOI: https://doi.org/10.1007/JHEP05(2011)023

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