Abstract
We note that the recent direct measurement of the top quark mass at 173.3±5.6 ( stat ) ±6.2 ( syst ) by DØ, collaboration severely constrains the theoretically attractive infrared fixed point scenario of the top quark Yukawa coupling in supersymmetric GUTs. For one-step unified models the above-mentioned measurement bounds the arbitrary but experimentally determinable parameter tan β to the range 1.3≤ tan β≤2.1. Further crunch on the top quark mass may determine tan β even more accurately within the fixed point scenario. On the other hand, an experimental value of tan β>2.1 will rule out the fixed point scenario bounding [Formula: see text] to 0.022 from above.
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