Yukawa hierarchies at the point of E8 in F-theory
Entity
UAM. Departamento de Física TeóricaPublisher
SISSA; Springer VerlagDate
2015-04-30Citation
10.1007/JHEP04(2015)179
Journal of High Energy Physics 2015.4 (2015): 179
ISSN
1029-8479 (online)DOI
10.1007/JHEP04(2015)179Funded by
This work has been partially supported by the grant FPA2012-32828 from the MINECO, the REA grant agreement PCIG10-GA-2011-304023 from the People Programme of FP7 (Marie Curie Action), the ERC Advanced Grant SPLE under contract ERC-2012-ADG-20120216-320421 and the grant SEV-2012-0249 of the “Centro de Excelencia Severo Ochoa” Programme. F.M. is supported by the Ramón y Cajal programme through the grant RYC-2009-05096. G.Z. is supported through a grant from “Campus Excelencia Internacional UAM+CSIC” and partially by the COST Action MP1210. D.R. is supported by a grant of the Max Planck SocietyProject
Gobierno de España. FPA2012-32828; info:eu-repo/grantAgreement/EC/FP7/304023; info:eu-repo/grantAgreement/EC/FP7/320421; Gobierno de España. RYC-2009-05096Editor's Version
http://dx.doi.org/10.1007/JHEP04(2015)179Subjects
F-Theory; Quark Masses and SM Parameters; GUT; FísicaNote
Journal of High Energy Physics 2015.4 (2015): 179 reproduced by permission of Scuola Internazionale Superiore di Studi Avanzati (SISSA)Rights
© 2015, The Author(s)Abstract
We analyse the structure of Yukawa couplings in local SU(5) F-theory models with E8 enhancement. In this setting the E8 symmetry is broken down to SU(5) by a 7-brane configuration described by T-branes, all the Yukawa couplings are generated in the vicinity of a point and only one family of quarks and leptons is massive at tree-level. The other two families obtain their masses when non-perturbative effects are taken into account, being hierarchically lighter than the third family. However, and contrary to previous results, we find that this hierarchy of fermion masses is not always appropriate to reproduce measured data. We find instead that different T-brane configurations breaking E8 to SU(5) give rise to distinct hierarchical patterns for the holomorphic Yukawa couplings. Only some of these patterns allow to fit the observed fermion masses with reasonable local model parameter values, adding further constraints to the construction of F-theory GUTs. We consider an E8 model where such appropriate hierarchy is realised and compute its physical Yukawas, showing that realistic charged fermions masses can indeed be obtained in this case
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Google Scholar:Marchesano, Fernando
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Regalado, Diego
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Zoccarato, Gianluca
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