| Adjoint Messengers and Perturbative Unification at the String Scale (2007) | |||||||||||||
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| We consider states in the adjoint representation of the Standard Model gauge group as messengers for mediation of supersymmetry (SUSY) breaking. These new messengers can shift the gauge coupling unification to the string scale at O(5 \Theta 10 17 GeV) if their masses are at O(10 14 GeV). The predicted SUSY mass spectrum at the electroweak scale is significantly different from those in other gauge-mediated or supergravity models, resulting in robust mass relations. The gravitino mass is predicted to be about 1 \Gamma 10 GeV. The heavy messenger sector could provide a superheavy dark matter candidate. PACS numbers: 12.10.Dm, 12.60.Jv, 14.80.-j, 14.80.Ly Introduction: Weak scale supersymmetry (SUSY) is arguably the strongest candidate for physics beyond the Standard Model (SM). One of the most attractive features is that the supersymmetric SU(5) theory provides a non-trivial coupling unification for the SM gauge group SU c (3) \Theta SUL (2) \Theta U Y (1), consistent with th... | |||||||||||||
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