Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-04-04
Phys.Rev.D78:075020,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 5 figures; comments added, figure 5 extended; version to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.78.075020
We investigate the effect of supersymmetric (SUSY) threshold corrections on the values of the running quark and charged lepton masses at the GUT scale within the large $\tan\beta$ regime of the MSSM. In addition to the typically dominant SUSY QCD contributions for the quarks, we also include the electroweak contributions for quarks and leptons and show that they can have significant effects. We provide the GUT scale ranges of quark and charged lepton Yukawa couplings as well as of the ratios $m_\mu/m_s$, $m_e/m_d$, $y_\tau/y_b$ and $y_t/y_b$ for three example ranges of SUSY parameters. We discuss how the enlarged ranges due to threshold effects might open up new possibilities for constructing GUT models of fermion masses and mixings.
Antusch Stefan
Spinrath Martin
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