Unification and fermion mass relations in low string scale D-brane models

Details Unification and fermion mass relations in low string scale D-brane models Unification and fermion mass relations in low string scale D-brane models

2006-05-25

arxiv.org/abs/hep-ph/0605278v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 3 figures. Talk presented at the ``Corfu Summer Institute'', Corfu-Greece, September 4-14, 2005. To appear in the pr

Scientific paper

In this talk, gauge coupling evolution is analyzed in D-brane inspired models with two Higgs doublets and a U(3)xU(2)xU(1)^N gauge symmetry. In particular, we focus on D-brane configurations with two or three abelian factors. We find that the correct hypercharge assignment of the Standard Model particles is reproduced for six viable models distinguished by different brane configurations. We also investigate the bottom tau quark mass relation and find that the correct low energy m_b / m_\tau ratio is obtained for equal b-\tau Yukawa couplings at a string scale around 10^3 TeV.

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