Implications of Non-universal Soft Masses on Gauge Coupling Unification
release_rev_69c8142a-e78e-41dd-8525-b55f7fb01b5e
by
R.Altendorfer,
T.Kobayashi
1995
Abstract
We study the gauge coupling unification of the minimal supersymmetric
standard model with non-universal soft scalar and gaugino masses. The
unification scale of the gauge couplings is estimated for non-universal cases.
It is sensitive to the non-universality. It turns out that these cases can be
combined with the assumption of string unification, which leads to a prediction
of sin^2 θ_W(M_Z) and k_1, the normalisation of the U(1)_Y
generator. String unification predicts k_1=1.3 - 1.4. These values have
non-trivial implications on string model building. Two-loop corrections are
also calculated. Some of these cases exhibit a large discrepancy between
experiment and string unification. We calculate string threshold corrections to
explain the discrepancy.
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