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Article
Report number	hep-th/0601003 ; CERN-PH-TH-2005-247 ; LPTHE-05-33 ; UAB-FT-595 ; CERN-PH-TH-2005-247
Title	Split extended supersymmetry from intersecting branes
Author(s)	Antoniadis, Ignatios (CERN) ; Benakli, Karim (Paris, LPTHE) ; Delgado, Antonio (CERN) ; Quiros, Mariano (ICREA, Barcelona) ; Tuckmantel, Marc (CERN ; Zurich, ETH)
Affiliation	(CERN)
Publication	2006
Imprint	2006-01
Number of pages	32 p, 32
In:	Nucl. Phys. B 744 (2006) 156-179
DOI	10.1016/j.nuclphysb.2006.03.012
Subject category	Particle Physics - Theory
Abstract	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.
Copyright/License	Elsevier B.V.

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