Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-10-19
JHEP 1001:003,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 16 figures, comment added
Scientific paper
10.1007/JHEP01(2010)003
We study the fine-tuning problem in the context of general gauge mediation. Numerical analyses toward for relaxing fine-tuning are presented. We analyse the problem in typical three cases of the messenger scale, that is, GUT ($2\times10^{16}$ GeV), intermediate ($10^{10}$ GeV), and relatively low energy ($10^6$ GeV) scales. In each messenger scale, the parameter space reducing the degree of tuning as around 10% is found. Certain ratios among gluino mass, wino mass and soft scalar masses are favorable. It is shown that the favorable region becomes narrow as the messenger scale becomes lower, and tachyonic initial conditions of stop masses at the messenger scale are favored to relax the fine-tuning problem for the relatively low energy messenger scale. Our spectra would also be important from the viewpoint of the $\mu-B$ problem.
Kobayashi Tatsuo
Nakai Yuichiro
Takahashi Ryo
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