Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-12-30
Nucl.Phys.B744:156-179,2006
Physics
High Energy Physics
High Energy Physics - Theory
32 pages, 3 figures
Scientific paper
10.1016/j.nuclphysb.2006.03.012
We study string realizations of split extended supersymmetry, recently proposed in hep-ph/0507192. Supersymmetry is broken by small ($\epsilon $) deformations of intersection angles of $D$-branes giving tree-level masses of order $m_0^2\sim \epsilon M_s^2$, where $M_s$ is the string scale, to localized scalars. We show through an explicit one-loop string amplitude computation that gauginos acquire hierarchically smaller Dirac masses $m_{1/2}^D \sim m_0^2/M_s$. We also evaluate the one-loop Higgsino mass, $\mu$, and show that, in the absence of tree-level contributions, it behaves as $\mu\sim m_0^4/M_s^3$. Finally we discuss an alternative suppression of scales using large extra dimensions. The latter is illustrated, for the case where the gauge bosons appear in N=4 representations, by an explicit string model with Standard Model gauge group, three generations of quarks and leptons and gauge coupling unification.
Antoniadis Ignatios
Benakli Karim
Delgado Antonio
Quiros Mariano
Tuckmantel Marc
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