Improved Higgs Mass Stability Bound in the Standard Model and Implications for Supersymmetry

Abstract

We re-examine the lower bound on the mass of the Higgs boson, $M_H$, from Standard Model vacuum stability including next-to-leading-log radiative corrections. This amounts to work with the full one-loop effective potential, $V(\varphi )$, improved by two-loop RGE, and allows to keep control of the scale invariance of $V$ in a wide range of the $\varphi$-field. Our results show that the bound is $\mathcal{O}(10GeV)$ less stringent than in previous estimates. In addition we perform a detailed comparison between the SM lower bounds on $M_H$ and the supersymmetric upper bounds on it. It turns out that depending on the actual value of the top mass, $M_t$, the eventually measured Higgs mass can discard the pure SM, the Minimal Supersymmetric Standard Model or both.

11 pages + 7 postscript figures appended at the end, Latex, IEM-FT-93/94

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• Evidence for Top Quark Production in $\bar{p}p$ Collisions at $\sqrt{s}=1.8$ TeV

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