DT3: Collider signatures of non-standard SUSY scenarios

Arguably, low-energy supersymmetry is a very exciting option for physics beyond the standard model. While nowadays much effort goes into the study of MSSM type collider phenomenology, it is quite possible that at LHC a somewhat different scenario will be found. For instance, one can entertain the possibility that the lightest superpartner (LSP) is the gravitino or another weakly coupled particle (`modulino'), in which case the next-to-lightest superpartner (NSP) can be charged. In such a situation one might even hope to directly probe the mechanism that breaks supersymmetry. Soft supersymmetry breaking terms can be described by higher-dimensional operators that arise from integrating out a messenger sector. Depending on the nature of the messengers the calculation of the higher-dimensional operators might require the supergravity formalism. Certain types of radiative corrections can be evaluated by using renormalization group techniques. With these methods one can obtain predictions for the spectra at the TeV scale, which will be accessible to the LHC. The study of scenarios with a gravitino LSP and a charged NSP has been proposed in 2004 [1, 2]. Since then a lot of effort has been made in order to elaborate on this and related scenarios (see e.g. [3, 4, 5] for recent reviews). On the other hand, studies like [6] show that there is still a lot of room for new, exiting and related scenarios.

References:

1. W. Buchmuller, K. Hamaguchi, M. Ratz and T. Yanagida,
   Supergravity at colliders,
   Phys. Lett. B588 (2004) 90, hep-ph/0402179.
2. W. Buchmuller, K. Hamaguchi, M. Ratz and T. Yanagida,
   Gravitino and goldstino at colliders,
   hep-ph/0403203.
3. J. Kersten and K. Schmidt-Hoberg,
   The gravitino-stau scenario after catalyzed BBN,
   arXiv:0710.4528 [hep-ph].
4. F. D. Steffen,
   Supersymmetric dark matter candidates - the lightest neutralino, the gravitino, and the axino,
   arXiv:0711.124 [hep-ph].
5. J. L. Feng,
   Collider physics and cosmology,
   arXiv:0801.1334 [gr-qc].
6. W. Buchmüller, L. Covi, K. Hamaguchi, A. Ibarra, and T. Yanagida,
   Gravitino dark matter in R-parity breaking vacua,
   JHEP 03 (2007) 037, hep-ph/0702184.