Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-01-29
Phys.Rev. D59 (1999) 015007
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex, 40 pages, 14 figures. Replacing an earlier version of the manuscript. Extra section added discussing limits on $\delta$
Scientific paper
10.1103/PhysRevD.59.015007
The supersymmetric contributions to the Flavor Changing Neutral Current processes may be suppressed by decoupling the scalars of the first and second generations. It is known, however, that the heavy scalars drive the stop mass squareds negative through the two-loop Renormalization Group evolution. This tension is studied in detail. Two new items are included in this analysis: the effect of the top quark Yukawa coupling and the QCD corrections to the supersymmetric contributions to $\Delta m_K$. Even with Cabibbo-like degeneracy between the squarks of the first two generations, these squarks must be heavier than $\sim 40$ TeV to suppress $\Delta m_K$. This implies, in the case of a high scale of supersymmetry breaking, that the boundary value of the stop mass has to be greater than $\sim 7$ TeV to keep the stop mass squared positive at the weak scale. Low-energy supersymmetry breaking at a scale that is of the same order as the mass of the heavy scalars is also considered. In this case the finite parts of the two-loop diagrams are computed to estimate the contribution of the heavy scalar masses to the stop mass squared. It is found that for Cabibbo-like mixing between the squarks, the stop mass at the boundary needs to be larger than $\sim 2$ TeV. Thus, for both cases, the large boundary value of the stop masses leads to an unnatural amount of fine tuning to obtain the correct $Z$ mass.
Agashe Kaustubh
Graesser Michael
No associations
LandOfFree
Supersymmetry Breaking and the Supersymmetric Flavour Problem: An Analysis of Decoupling the First Two Generation Scalars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Supersymmetry Breaking and the Supersymmetric Flavour Problem: An Analysis of Decoupling the First Two Generation Scalars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Supersymmetry Breaking and the Supersymmetric Flavour Problem: An Analysis of Decoupling the First Two Generation Scalars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-316933