# HEP/Astro Seminar, Monday 2nd November 1998

## Raman Sundrum (Boston University)




### Abstract

We show that in a general hidden sector model, supersymmetry breaking
necessarily generates at one-loop a scalar and gaugino mass as a consequence of
the super-Weyl anomaly. We study a scenario in which this contribution
dominates. We consider the Standard Model particles to be localized on a
(3+1)-dimensional subspace or 3-brane'' of a higher dimensional spacetime,
while supersymmetry breaking occurs off the 3-brane, either in the bulk or on
another 3-brane. At least one extra dimension is assumed to be compactified
roughly one to two orders of magnitude below the four-dimensional Planck
scale. This framework is phenomenologically very attractive; it introduces new
possibilities for solving the supersymmetric flavor problem, the gaugino mass
problem, the supersymmetric CP  problem, and the $\mu$-problem. Furthermore,
the compactification scale can be  consistent with a unification of gauge and
gravitational couplings. We demonstrate these claims in a four-dimensional
effective theory below the compactification scale that incorporates the rele!
vant features of the underlying higher dimensional theory and the contribution
of the super-Weyl anomaly. Naturalness constraints  follow not only from
symmetries but also from the higher dimensional origins of the theory. We also
introduce additional bulk contributions to the MSSM soft
masses. This scenario is very predictive: the gaugino and squark masses are
given in terms of MSSM renormalization group functions.


## Monday 2pm, Smith Lab 4079

Francesco Antonuccio ( anton@pacific.mps.ohio-state.edu), last updated 20-JAN-98.