Recent direct measurement of the Top quark mass and quasi-infrared fixed point

Details Recent direct measurement of the Top quark mass and quasi-infrared fixed point Recent direct measurement of the Top quark mass and quasi-infrared fixed point

1997-06-24

arxiv.org/abs/hep-ph/9706494v1

Mod.Phys.Lett. A12 (1997) 1969-1972

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, Latex with epsf style, 1 figure, captions.sty

Scientific paper

10.1142/S0217732397002016

We note that the recent direct measurement of the top quark mass at $173.3 \pm 5.6 (stat) \pm 6.2 (syst)$ by D0 collaboration severely constrains the theoretically attractive infra-red 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 $\tan \beta$ to the range $1.3 \le \tan \beta \le 2.1$. Further crunch on the top quark mass may determine $\tan \beta$ even more accurately within the fixed point scenario. On the other hand an experimental value of $\tan \beta > 2.1$ will rule out the fixed point scenario bounding $h^2_t(M_X)/4 \pi$ to 0.022 from above.

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