Search for the direct production of charginos, neutralinos and staus in final states with at least two hadronically decaying taus and missing transverse momentum in pp collisions at s√=8 TeV with the ATLAS detector

Results of a search for the electroweak associated production of
charginos and next-to-lightest neutralinos, pairs of charginos or
pairs of tau sleptons are presented. These processes are
characterised by final states with at least two hadronically
decaying tau leptons, missing transverse momentum and low jet
activity. The analysis is based on an integrated luminosity of 20.3
fb−1 of proton-proton collisions at s√=8 TeV recorded with the
ATLAS experiment at the Large Hadron Collider. No significant
excess is observed with respect to the predictions from Standard
Model processes. Limits are set at 95% confidence level on the
masses of the lighter chargino and next-to-lightest neutralino for
various hypotheses for the lightest neutralino mass in simplified
models. In the scenario of direct production of chargino pairs,
with each chargino decaying into the lightest neutralino via an
intermediate tau slepton, chargino masses up to 345 GeV are
excluded for a massless lightest neutralino. For associated
production of mass-degenerate charginos and next-to-lightest
neutralinos, both decaying into the lightest neutralino via an
intermediate tau slepton, masses up to 410 GeV are excluded for a
massless lightest neutralino.