Is the stop mass below the top mass?
W. de Boer, R. Ehret, D. I. Kazakov
Abstract
It is shown that a top mass of 174+/-17 GeV, as quoted recently by the CDF Collaboration, constrains the mixing angle between the Higgs doublets in the Minimal Supersymmmetric extension of the Standard Model (MSSM) to: 1.2<tan beta<5.5 at the 90% C.L.. The most probable value corresponds to tan beta = 1.56; such a small value causes a large mixing in the stop sector and the lightest stop is likely to be below the top mass. In this case the stop production in ppbar collisions would contribute to the top signature, thus providing a possible explanation for the large effective ttbar cross section observed by CDF.
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