Speaker
Description
The direct pair-production of the tau-lepton superpartner, stau, is one of the
most interesting channels to search for SUSY. First of all the stau is with high
probability the lightest of the scalar leptons. Secondly the signature of stau
pair production signal events is one of the most difficult ones, yielding the
'worst' and thus most general scenario for the searches.
Future e+e- Higgs factories offer excellent facilities for SUSY
searches. With respect to previous e+e- colliders, they increase the luminosity
and centre-of-mass energy and improve the technologies, while, with
respect to hadron colliders, they offer a cleaner environment, a known
initial state and a triggerless operation of the detectors.
In this contribution, the prospects for discovering stau-pair
production at the future e+e- colliders and the resulting detector
requirements will be discussed.
For detector-level simulations, the study takes the ILD detector concept
and ILC parameters at 500 GeV as example. It includes all SM
backgrounds, as well as beam induced backgrounds, as overlay-on-physics
and - for the first time - overlay-only events, and considers the
worst-case scenario for the stau-mixing. It shows that with the chosen
accelerator and detector conditions, SUSY will be discovered if the
NLSP mass is up to just a few GeV below the kinematic limit of the
collider.
Based on these results, expectations for other center-of-mass energies,
luminosities, beam polarisations, beam background and detector
conditions will derived.
