Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-10-07
Phys.Rev. D55 (1997) 7255-7262
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, 6 figures; uses epsf and rotate macros
Scientific paper
10.1103/PhysRevD.55.7255
Matching conditions relate couplings to particle masses. We discuss the importance of one-loop matching conditions in Higgs and top-quark sector as well as the choice of the matching scale. We argue for matching scales $\mu_{0,t} \simeq m_t$ and $\mu_{0,H} \simeq max[ m_t, M_H ]$. Using these results, the two-loop Higgs mass upper bounds are reanalyzed. Previous results for $\Lambda\approx$ few TeV are found to be too stringent. For $\Lambda=10^{19}$ GeV we find $M_H < 180 \pm 4\pm 5$ GeV, the first error indicating the theoretical uncertainty, the second error reflecting the experimental uncertainty due to $m_t=175\pm6$ GeV.
Hambye Thomas
Riesselmann Kurt
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