Fine Tuning in General Gauge Mediation - High Energy Physics - PhenomenologyReport as inadecuate

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Abstract: We study the fine-tuning problem in the context of general gauge mediation.Numerical analyses toward for relaxing fine-tuning are presented. We analysethe 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 thedegree of tuning as around 10% is found. Certain ratios among gluino mass, winomass and soft scalar masses are favorable. It is shown that the favorableregion becomes narrow as the messenger scale becomes lower, and tachyonicinitial conditions of stop masses at the messenger scale are favored to relaxthe fine-tuning problem for the relatively low energy messenger scale. Ourspectra would also be important from the viewpoint of the $\mu-B$ problem.

Author: Tatsuo Kobayashi, Yuichiro Nakai, Ryo Takahashi


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