Split supersymmetry in brane models
IGNATIOS ANTONIADIS
Department of Physics, CERN-Theory Division, 1211
E-mail: Ignatios.Antoniadis@cern.ch
Abstract. Type-I
string theory in the presence of internal magnetic
fields provides a concrete
realization of split supersymmetry. To
lowest order, gauginos
are massless while squarks
and sleptons are
superheavy.
For weak magnetic fields, the correct Standard Model
spectrum guarantees gauge coupling
unification with
$\sin^2{\theta_{\rm W}}=3/8$ at the compactification
scale of $M_{\rm
GUT}\simeq 2 \times 10^{16}$ GeV. I discuss mechanisms
for generating
gaugino
and higgsino masses at the TeV
scale, as well as
generalizations to models with
split extended supersymmetry in the
gauge sector.
Keywords. Supersymmetry;
D-branes; magnetic fluxes; gaugino
masses.
PACS Nos 12.60.Jv; 11.30.Pb