Mediation of Supersymmetry Breaking in Gauge Messenger Model(7)

We study gauge mediation of supersymmetry breaking in SU(5) supersymmetric grand unified theory with gauge fields as messengers. The generated soft supersymmetry breaking parameters lead to close to maximal mixing scenario for the Higgs mass and highly red

2.1Large(maximal)mixinginmodels

Sincetheradiativelygeneratedmaximalmixingscenariocaninprincipleeliminate netuningofEWSBcompletely,itisdesirabletoseewhetheritispossibletogetevenclosetoitinspeci cmodels.

ItiseasytoseethatthissolutiondoesnotexistinmSUGRA.Asaconsequenceofuniversalitiesingauginoandscalarmasses,whenstopmasssquaredisnegativeenoughtogeneratemaximalstopmixingattheEWscaleradiatively,sleptonsremaintachyonicevenattheEWscalebecausethebinocontributiontotherunningofsleptonmassesissmall.TheEWscalesleptonmassism2e 22

RGeVgivesthefollowinginequality m0+0.15M1/2[17].Imposingtheslepton

massbound100

m20≥ (0.4)2+(100GeV

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