Flavour physics without flavour symmetries

Buchmuller, Wilfried; Patel, Ketan M.

Preprint/Report

PUBDB-2018-00638

Flavour physics without flavour symmetries

Buchmuller, W. (Corresponding author)DESY* ; Patel, K. M. (Corresponding author)

2017

[10.3204/PUBDB-2018-00638]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2018-00638

Report No.: DESY-17-220; arXiv:1712.06862

Abstract: We quantitatively analyze a quark-lepton flavour model derived from a six-dimensional supersymmetric theory with $SO(10)\times U(1)$ gauge symmetry, compactified on an orbifold with magnetic flux. Two bulk $\mathbf{16}$-plets charged under the $U(1)$ provide the three quark-lepton generations whereas two uncharged $\mathbf{10}$-plets yield two Higgs doublets. At the orbifold fixed points mass matrices are generated with rank one or two. Moreover, the zero modes mix with heavy vectorlike split multiplets. The model possesses no flavour symmetries. Nevertheless, there exist a number of relations between Yukawa couplings, remnants of the underlying GUT symmetry and the wave function profiles of the zero modes, which lead to a prediction of the light neutrino mass scale, $m_{\nu_1} \sim 10^{-3}$ eV and heavy Majorana neutrino masses in the range from $10^{12}$ GeV to $10^{14}$ GeV. The model successfully includes thermal leptogenesis.

Keyword(s): new physics ; supersymmetry ; space-time: dimension: 6 ; fixed point: orbifold ; compactification: orbifold ; symmetry: SO(10) x U(1) ; symmetry: gauge ; Higgs particle: doublet: 2 ; grand unified theory ; flavor: model ; neutrino: mass ; leptogenesis: thermal